Kerala Syllabus Class 9 Biology Model Question Paper Set 1 Malayalam Medium

Students can practice with Kerala Syllabus 9th Standard Biology Question Paper Set 1 Malayalam Medium to familiarize themselves with the exam format.

Kerala Syllabus Std 9 Biology Model Question Paper Set 1 Malayalam Medium

സമയം: 1/2 മണിക്കൂർ
ആകെ സ്കോർ: 40

നിർദ്ദേശങ്ങൾ :

  • ആദ്യ പതിനഞ്ചു മിനിറ്റ് സമാശ്വാസ സമയമാണ്. ചോദ്യങ്ങൾ, വായിക്കാനും ഉത്തരങ്ങൾ ക്രമപ്പെടുത്തുവാനും ഈ സമയം വിനിയോഗിക്കേണ്ടതാണ്.
  • ചോദ്യങ്ങളും നിർദ്ദേശങ്ങളും ശ്രദ്ധാപൂർവ്വം വായിച്ച് ഉത്തരം എഴുതുക.
  • ഉത്തരമെഴുതുമ്പോൾ സ്കോർ, സമയം എന്നിവ പരിഗണിക്കണം.

I. 1 മുതൽ 5 വരെയുള്ള ചോദ്യങ്ങളിൽ ഏതെങ്കിലും നാലെണ്ണത്തിന് ഉത്തരമെഴുതുക. സ്കോർ വീതം. (4 × 1 = 4)

Question 1.
തന്നിരിക്കുന്നവയിൽ പോഷകത്തിന്റെ ഘട്ടമല്ലാത്ത പ്രക്രിയ തിരിച്ചറിയുക.
യാന്ത്രിക ദഹനം, ആഗിരണം, പെരിസ്റ്റാൾസിസ്, വിഴുങ്ങൽ
Answer:
പെരിസ്റ്റാൾ സിസ്

Question 2.
പ്രകാശസംശ്ലേഷണത്തിന്റെ ഇരുണ്ട ഘട്ടത്തിലെ പ്രതികരണങ്ങൾ വിശദീകരിച്ച ശാസ്ത്രജ്ഞന്റെ പേര് പറയുക.
Answer:
മെൽവിൻ കാൽവിൻ.

Question 3.
യൂറിയ നിർമ്മാണം നടക്കുന്ന അവയവത്തിന്റെ പേര് പറയുക.
Answer:
കരൾ

Question 4.
കോശദ്രവ്യത്തിൽ നടക്കുന്ന കോശശ്വസനത്തിന്റെ ഘട്ടത്തിന് പേര് നൽകുക.
Answer:
ഗ്ലൈക്കോളിസിസ്.

Question 5.
സമുദ്ര ആവാസവ്യവസ്ഥയിലെ പ്രധാന നിർമ്മാതാക്കൾ ആരാണ്?
Answer:
ആൽഗകളും ഫൈറ്റോപ്ലാങ്ക്ടണുകളും

Kerala Syllabus Class 9 Biology Model Question Paper Set 1 Malayalam Medium

II. 6 മുതൽ 10 വരെയുള്ള ചോദ്യങ്ങളിൽ ഏതെങ്കിലും നാലെണ്ണത്തിന് ഉത്തരമെഴുതുക. സ്കോർ വീതം. (4 × 2 = 8)

Question 6.
പ്രകാശസംശ്ലേഷണത്തിന്റെ ഘട്ടങ്ങളിലൊന്ന് കാൽവിൻ സൈക്കിൾ എന്നറിയപ്പെടുന്നു.
a) ഘട്ടം തിരിച്ചറിയുക.
b) എന്തുകൊണ്ടാണ് ഇത് കാൽവിൻ സൈക്കിൾ എന്നറിയപ്പെടുന്നത്?
Answer:
a) ഇരുണ്ട ഘട്ടം.
b) ഇരുണ്ട ഘട്ടത്തിലെ പ്രവർത്തനങ്ങളെക്കുറിച്ചു ള്ള വിശദീകരണങ്ങൾ നൽകിയത് മെൽവിൻ കാൽവിൻ എന്ന ശാസ്ത്രജ്ഞനായിരുന്നു.

Question 7.
പ്രകൃതി ദുരന്തങ്ങൾ ലഘൂകരിക്കുന്നതിൽ സസ്യങ്ങളുടെ പങ്ക് സൂചിപ്പിക്കുന്ന അനുയോജ്യമായ രണ്ട് ഉദാഹരണങ്ങൾ എഴുതുക.
Answer:

  • സുനാമിയെ ഒരു പരിധിവരെ നിയന്ത്രിക്കാൻ കണ്ടൽക്കാടുകൾ സഹായിക്കുന്നു.
  • മുളങ്കാടുകൾ, ഞാങ്ങണ, വെറ്റില, ചെറുനാരങ്ങ മുതലായവ വെള്ളപ്പൊക്ക സമയത്ത് നദീതീ രങ്ങൾ തകരാതെ സംരക്ഷിക്കുന്നു.
  • മരങ്ങളും കുറ്റിക്കാടുകളും മണ്ണൊലിപ്പും മണ്ണിടി ച്ചിലും തടയുന്നു. (ഏതെങ്കിലും രണ്ടെണ്ണം എഴു തുക)

Question 8.
ലാക്ടീലുകളിലേക്ക് പദാർത്ഥങ്ങൾ ആഗിരണം ചെയ്യുന്നതുമായി ബന്ധപ്പെട്ട് തന്നിരിക്കുന്ന രേഖാചിത്രം നിരീക്ഷിക്കുകയും ചോദ്യങ്ങൾക്ക് ഉത്തരം നൽകുകയും ചെയ്യുക.
Kerala Syllabus Class 9 Biology Model Question Paper Set 1 Malayalam Medium 1
a) പ്രക്രിയ തിരിച്ചറിയുക.
b) ഈ പ്രക്രിയയിലൂടെ ഏത് പോഷകങ്ങളാണ് ആഗിരണം ചെയ്യപ്പെടുന്നത്?
Answer:
a) സിമ്പിൾ ഡിഫ്യൂഷൻ
b) ഫാറ്റി ആസിഡും ഗ്ലിസറോളും

Question 9.
വിവിധ ജീവികളിൽ ശ്വസന ഉപരിതലങ്ങൾ വ്യത്യസ്തമാണ്. തന്നിരിക്കുന്ന ജീവികളുടെ ശ്വസന ഉപരിതലങ്ങൾ പരാമർശിക്കുക.
a) മത്സ്യം
b) മണ്ണിര
Answer:
a) മത്സ്യം-ശകുലം (Gills)
b) മണ്ണിര-ത്വക്ക് (Cutaneous respiration)

Question 10.
തന്നിരിക്കുന്ന സൂചകങ്ങൾ ഹൃദയത്തിന്റെ ഭിത്തിയുടെ ഒരു പ്രത്യേക ഭാഗവുമായി ബന്ധപ്പെട്ടിരിക്കുന്നു. അവ വിശകലനം ചെയ്യുകയും ചോദ്യങ്ങൾക്ക് ഉത്തരം നൽകുകയും ചെയ്യുക.
• ഒരു ഇലക്ട്രിക് സെൽ പോലെയുള്ള പ്രവർത്തനങ്ങൾ.
• വലതു ആട്രിയൽ ഭിത്തിയിൽ സ്ഥിതിചെയ്യുന്നു.
a) ഹൃദയത്തിൻറെ ഏത് ഭാഗമാണ് സൂചനകളിൽ പരാമർശിച്ചിരിക്കുന്നത്?
b) അതിന്റെ പ്രവർത്തനം എന്താണ്?
Answer:
a) പേസ്മേക്കർ (സിനോ ആട്രിയൽ നോഡ്)
b) ഹൃദയത്തിന്റെ പ്രവർത്തനം പുനരാരംഭിക്കു കയും, ഹൃദയമിടിപ്പിന്റെ നിരക്ക് നിയന്ത്രിക്കു കയും ചെയ്യുന്നു.

Kerala Syllabus Class 9 Biology Model Question Paper Set 1 Malayalam Medium

III. 11 മുതൽ 15 വരെയുള്ള ചോദ്യങ്ങളിൽ ഏതെങ്കിലും നാലെണ്ണത്തിന് ഉത്തരമെഴുതുക. സ്കോർ വീതം. (4 × 3 = 12)

Question 11.
യൂറിയയുടെ നിർമ്മാണം കരളിൽ നടക്കുന്നു.
a) യൂറിയ നിർമ്മാണം എങ്ങനെ സംഭവിക്കുന്നു?
b) എങ്ങനെയാണ് യൂറിയ ശരീരത്തിൽ നിന്നും പുറന്തള്ളുന്നത്? വിശദീകരിക്കുക.
c) എന്താണ് വിസർജ്ജനം?
Answer:
a) കലകളിൽ രൂപപ്പെടുന്ന അമോണിയ ടിഷ്യു ദ്രാവ കങ്ങളിലൂടെ രക്തത്തിലേക്ക് വ്യാപിക്കുകയും, രക്തം അത് കരളിലേക്ക് എത്തിക്കുകയും ചെ യ്യുന്നു. കരളിൽ ചില എൻസൈമുകളുടെ സഹാ യത്തോടെ അമോണിയ കാർബൺ ഡൈഓ ഡുമായും, വെള്ളവുമായും സംയോജിച്ച് യൂറിയ ഉണ്ടാക്കുന്നു.

b) യൂറിയ ഉൾപ്പെടെയുള്ള മാലിന്യങ്ങൾ അടങ്ങിയ മൂത്രം പുറന്തള്ളുന്നതിൽ വൃക്കകൾക്ക് പ്രധാന പങ്കുണ്ട്. പ്രോട്ടീൻ അടങ്ങിയ ഭക്ഷണങ്ങൾ (മാംസം, കോഴി, ചില പച്ചക്കറികൾ എന്നിവ പോലുള്ളവ) ശരീരത്തിൽ വിഘടിപ്പിക്കപ്പെടു മ്പോഴാണ് യൂറിയ ഉണ്ടാകുന്നത്. യൂറിയ രക്ത ത്തിലൂടെ വൃക്കകളിലേക്ക് കൊണ്ടുപോകുന്നു. ഇവിടെയാണ് ഇത് വെള്ളത്തിനും മറ്റ് മാലിന്യങ്ങ ൾക്കുമൊപ്പം മൂത്രത്തിന്റെ രൂപത്തിൽ നീക്കം ചെയ്യുന്നത്.

c) ശരീരത്തിൽ നിന്ന് മാലിന്യങ്ങൾ നീക്കം ചെയ്യുന്ന പ്രക്രിയയാണ് വിസർജ്ജനം,

Question 12.
രക്തം ഗ്ലോമറുലസിലൂടെ ഒഴുകുമ്പോൾ അതിലെ സുഷിരങ്ങളിലൂടെ സൂക്ഷ്മ അരിക്കലിന് വിധേയ മാകുന്നു. ഇതിന്റെ ഫലമായി ‘ഗ്ലോമറുലാർ ഫിൽട്രേറ്റ് എന്ന ദ്രാവകം രൂപപ്പെടുന്നു. ഗ്ലോമറുലാർ ഫിൽട്രേറ്റിലെ എല്ലാ ഘടകങ്ങളും മൂത്രത്തിൽ ഇല്ലാത്തത് എന്തുകൊണ്ടാണ്? പുനരാഗീരണം ചെയ്യപ്പെടുന്ന ഘടകങ്ങളും, സ്രവിക്കുന്ന ഘടകങ്ങളും കണ്ടെത്തുക.
Answer:
കാരണം ഗ്ലോമറുലാർ ഫിൽട്രേറ്റിലെ ചില ഘടക ങ്ങൾ രക്തത്തിലേക്ക് വീണ്ടും ആഗിരണം ചെയ്യപ്പെ ടുകയും ചിലത് വൃക്കാനളികകളിലേക്ക് സ്രവിക്ക പ്പെടുകയും ചെയ്യുന്നു. അതിനാൽ, ഗ്ലോമറുലാർ ഫിൽട്രേറ്റിലെ എല്ലാ സംയുക്തങ്ങളും മൂത്രത്തിൽ ഉണ്ടാകില്ല.

പുനരാഗിരണം ചെയ്യപ്പെടുന്ന ഘടകങ്ങൾ: ഗ്ലൂക്കോസ്, അമിനോ ആസിഡുകൾ, Nal, മറ്റ് അവശ്യ ലവണങ്ങൾ സ്രവിക്കുന്ന ഹൈഡ്രജനു: ണുകൾ, പൊട്ടാസ്യം അയോണുകൾ മുതലായവ.

Question 13.
ചിത്രം നിരീക്ഷിക്കുകയും താഴെപ്പറയുന്ന ചോദ്യങ്ങൾക്ക് ഉത്തരം നൽകുകയും ചെയ്യുക.
Kerala Syllabus Class 9 Biology Model Question Paper Set 1 Malayalam Medium 2
a) ‘X’, ‘Y’ എന്നിവ തിരിച്ചറിഞ്ഞ് എഴുതുക.
b) ‘Y’ യുടെ അവസാനത്തിൽ കാണുന്ന അതിലോലവും ഇലാസ്തികതയുള്ളതുമായ വായു സഞ്ചികളുടെ പ്രവർത്തനങ്ങൾ എഴുതുക.
c) നിശ്വാസ സമയത്ത് ‘Z’-നുള്ളിലെ വോളിയം എങ്ങനെ കുറയുന്നു? ഇത് എങ്ങനെ സഹായകരമാണ്?
Answer:
a) X – ശ്വാസനാളം, Y = ശ്വസനിക

b) അതിലോലവും ഇലാസ്തികവുമായ ഞ്ചികളെ ആൽവിയോലസ് എന്ന് വിളിക്കുന്നു. ഇവ ശ്വസന പ്രതലത്തിന്റെ വിസ്തീർണ്ണം വർധിപ്പിച്ച് വാതകവിനിമയം കാര്യക്ഷമമാക്കുന്നു.

c) നിശ്വാസ സമയത്ത്, വാരിയെല്ലുകൾ താഴുന്ന തിന് ഇന്റർകോസ്റ്റൽ പേശികളും ഡയഫ്രവും പൂർവ്വസ്ഥിതി പ്രാപിക്കുന്നു. അങ്ങനെ ഔരസാ ശയ വ്യാപ്തം കുറയുന്നു.

Question 14.
മനുഷ്യരിലെ രക്തപര്യയന വ്യവസ്ഥയുമായി ബന്ധപ്പെട്ട ചിത്രീകരണം പൂർത്തിയാക്കുക
Kerala Syllabus Class 9 Biology Model Question Paper Set 1 Malayalam Medium 3
Answer:
i) ദ്വിപര്യയനം
ii) സിസ്റ്റമിക് പര്യയനം
iii) വലത് വെൻട്രിക്കിളിൽ നിന്ന് ആരംഭിച്ച് ഇടത് ആട്രിയത്തിൽ അവസാനിക്കുന്നു.

Question 15.
പോഷകങ്ങളെ ആഗിരണം ചെയ്യുന്ന പ്രക്രിയയ്ക്ക് ചെറുകുടലിലെ വില്ലസിന്റെ ഘടന എത്രത്തോളം അനുയോജ്യമാണ്?
Answer:
പോഷകങ്ങളെ ആഗിരണം ചെയ്യുന്നതിനായി ചെറു കുടലിന്റെ ഉൾഭിത്തിയിലുടനീളം കാണപ്പെടുന്ന വിരൽ പോലുള്ള ഭാഗങ്ങളാണ് വില്ലസുകൾ. ഇവ ചെറുകുടലിലെ ആഗിരണ പ്രതലവിസ്തീർണ്ണം അനേകം മടങ്ങ് വർധിപ്പിക്കുന്നു. 90 ശതമാന ത്തോളം വെള്ളവും ലഘു പോഷകങ്ങളും വില്ലസ് വഴി ആഗിരണം ചെയ്യപ്പെടുന്നു. പോഷകാഗിരണ ത്തിനുള്ള പ്രാഥമിക പ്രതലം ഒറ്റനിര എപ്പിത്തീ ലിയൽ കോശങ്ങളാൽ നിർമ്മിതമാണ്. ഒരു ധമനി ശാഖ വില്ലസിലേക്ക് പ്രവേശിച്ച് രക്തലോമികകളെ രൂപപ്പെടുത്തുന്നു. ലോമികകൾ കൂടിച്ചേർന്ന് സിര യായി പുറത്തുപോകുന്നു. ഗ്ലൂക്കോസ്, ഫ്രക്ടോസ്, ഗാലക്ടോസ്, അമിനോ ആസിഡുകൾ എന്നിവയെ ആഗിരണം ചെയ്യുന്നു. കൂടാതെ, ലിംഫ് വാഹിയുടെ ശാഖയായ ലാക്റ്റിയൽ, ഫാറ്റി ആസിഡുകളും ഗ്ലിസ റോളും ലിംഫിലേക്ക് ആഗിരണം ചെയ്യുന്നു.

Kerala Syllabus Class 9 Biology Model Question Paper Set 1 Malayalam Medium

IV. 16 മുതൽ 20 വരെയുള്ള ചോദ്യങ്ങളിൽ ഏതെങ്കിലും നാലെണ്ണത്തിന് ഉത്തരമെഴുതുക. സ്കോർ വീതം. (4 × 4 = 16)

Question 16.
ഓരോ പോഷകവും ശരീരം എങ്ങനെ ഉപയോഗിക്കുന്നു? കണ്ടെത്തുക.
Answer:
ദഹന പ്രക്രിയയുടെ ഫലമായി, കാർബോഹൈഡ്രേ റ്റുകൾ ലളിതമായ പഞ്ചസാരകളായി വിഭജിക്കപ്പെ ടുന്നു. ഗ്ലൂക്കോസ് രക്തത്തിലേക്ക് പ്രവേശിക്കുകയും അതുവഴി കോശങ്ങളിലേക്ക് എത്തുകയും ചെയ്യു ന്നു. അവിടെ ഇത് ഉടനടി ഊർജ്ജ ഉൽപാദന ത്തിനായി ഉപയോഗിക്കുന്നു അല്ലെങ്കിൽ പിന്നീടുള്ള ഉപയോഗത്തിനായി കരളിലും പേശികളിലും ക്കോജനായി സംഭരിക്കുന്നു.

ദഹനസമയത്ത് പ്രോട്ടീനുകൾ അമിനോ ആസി ഡുകളായി വിഭജിക്കപ്പെടുന്നു. അമിനോ ആസിഡു കൾ പിന്നീട് രക്തത്തിലേക്ക് ആഗിരണം ചെയ്യപ്പെടു കയും, വിവിധ ശരീര ഘടനകളും പ്രവർത്തനങ്ങളും നിർമ്മിക്കാനും നന്നാക്കാനും പരിപാലിക്കാനും ഉപ യോഗപ്പെടുത്തുകയും ചെയ്യുന്നു. ദഹനസമയത്ത് കൊഴുപ്പുകൾ ഫാറ്റി ആസിഡുകളായും ഗ്ലിസറോ ളായും വിഭജിക്കപ്പെടുന്നു. ഫാറ്റി ആസിഡുകൾ പിന്നീട് ഊർജ്ജ സംഭരണത്തിനായി കോശങ്ങളി ലേക്ക് കൊണ്ടുപോകുകയും, കോശസ്തരങ്ങളും സിഗ്നലിംഗ് തന്മാത്രകളും നിർമ്മിക്കാൻ ഉപയോഗി ക്കുകയും ചെയ്യുന്നു.

വിറ്റാമിനുകൾ ഭക്ഷണത്തിൽ നിന്ന് ചെറിയ അള “വിൽ ആഗിരണം ചെയ്യപ്പെടുകയും ശരീരത്തിലു ടനീളം കൊണ്ടുപോകുകയും ചെയ്യുന്നു. നിരവധി മെറ്റബോളിക് പ്രക്രിയകൾ നിയന്ത്രിക്കുന്നതിന് അവ എൻസൈമുകളുമായി ചേർന്ന് പ്രവർത്തിക്കുന്നു.

Question 17.
മനുഷ്യരുടെ രക്തചംക്രമണവ്യൂഹവുമായി ബന്ധപ്പെട്ട ഒരു ചിത്രം ചുവടെ നൽകിയിരിക്കുന്നു. അത് വിശകലനം ചെയ്യുകയും ചോദ്യങ്ങൾക്ക് ഉത്തരം നൽകുകയും ചെയ്യുക.
Kerala Syllabus Class 9 Biology Model Question Paper Set 1 Malayalam Medium 4
a) ഏത് അക്ഷരമാണ് ശ്വാസകോശ ധമനിയെ സൂചിപ്പിക്കുന്നത്?
b) D എന്ന അക്ഷരം ഏത് രക്തക്കുഴലിനെ സൂചിപ്പിക്കുന്നു?
c) വെൻട്രിക്കിളുകളിൽ പ്രവേശിച്ച രക്തം ആട്രിയയിലേക്ക് മടങ്ങുന്നുണ്ടോ? എന്തുകൊണ്ട്?
d) മനുഷ്യരിൽ ദ്വിപര്യയനത്തിന്റെ പ്രാധാന്യം എന്താണ്?
Answer:
a) A

b) മഹാധമനി

c) ഇല്ല, രക്തം ആട്രിയയിലേക്ക് തിരികെ ഒഴു കുന്നില്ല. കാരണം, ട്രൈകസ്പിഡ് വാൽവും ബൈകസ്പിഡ് വാൽവും വെൻട്രിക്കിളുകളിൽ നിന്ന് ആട്രിയയിലേക്കുള്ള രക്തത്തിന്റെ ബാ ക്ക്ഫ്ലോ തടയുന്നു.

d) സിസ്റ്റമിക് പര്യയനം (Systemic circulation) ഇടത്തേ വെൻട്രിക്കിളിൽ ആരംഭിച്ച് വല ഏട്രിയത്തിലും പൾമണറി പര്യയനം (Pulmonary circulation) വലത്തെ വെൻട്രിക്കിളിൽ ആരംഭിച്ച് ഇടത്തെ ഏട്രിയത്തിലും അവസാനിക്കുന്നു. രക്തപര്യയനത്തിൽ, ഒരേ രക്തം രണ്ടുപ്രാവശ്യം ഹൃദയത്തിലൂടെ കടന്നുപോകുന്നതിനാൽ മനു ഷ്യനിലെ രക്തപര്യയനം ദ്വിപര്യയനം (Double circulation) എന്ന് അറിയപ്പെടുന്നു. ഇത് ശരീര ത്തിലെ ഓക്സിജന്റെ അളവ് നിലനിർത്താൻ സഹായിക്കുന്നു.

Question 18.
ചുവടെ നൽകിയിരിക്കുന്ന ചിത്രം പകർത്തി വരയ്ക്കുക, സൂചകങ്ങളെ അടിസ്ഥാനമാക്കി ഭാഗങ്ങൾക്ക് പേര് നൽകുകയും, ലേബൽ ചെയ്യുകയും ചെയ്യുക.
Kerala Syllabus Class 9 Biology Model Question Paper Set 1 Malayalam Medium 5
a) ഓഡന്റോബ്ലാസ്റ്റ് കോശങ്ങൾ കാണപ്പെടുന്ന ഭാഗം
b) പല്ലിനെ മോണയിൽ ഉറപ്പിച്ച് നിർത്തുന്ന കല
c) പല്ല് നിർമ്മിച്ചിരിക്കുന്ന ജീവനുള്ള കല
Answer:
a) പൾപ്പ് ക്യാവിറ്റി
b) സിമെന്റം
c) ഡെന്റൈൻ

Question 19.
സസ്യങ്ങൾ അന്നജത്തിന്റെ രൂപത്തിൽ ഗ്ലൂക്കോസ് സംഭരിക്കുന്നു.
a) സസ്യങ്ങൾ ഇലകളിൽ അന്നജത്തിന്റെ രൂപത്തിൽ ഗ്ലൂക്കോസ് സംഭരിക്കുന്നത് എന്തുകൊണ്ട്?
b) എല്ലാ സസ്യങ്ങളും തയ്യാറാക്കുന്നത് ഗ്ലൂക്കോസ് ആണെങ്കിൽ, സസ്യഭക്ഷണങ്ങളിൽ നിന്ന് നമുക്ക് എങ്ങനെ അന്നജം, പ്രോട്ടീൻ, കൊഴുപ്പ് എന്നിവ ലഭിക്കും?
c) എന്തുകൊണ്ടാണ് സസ്യങ്ങളെ സ്വപോഷികൾ എന്ന് വിളിക്കുന്നത്?
Answer:
a) ഗ്ലൂക്കോസ് വെള്ളത്തിൽ എളുപ്പത്തിൽ ലയി ക്കുന്നതിനാൽ അത് സസ്യശരീരത്തിൽ സൂക്ഷി ക്കാൻ കഴിയില്ല. അതിനാൽ, സസ്യങ്ങൾ ഇല കളിൽ ലയിക്കാത്ത അന്നജത്തിന്റെ രൂപത്തിൽ ഗ്ലൂക്കോസ് സംഭരിക്കുന്നു.

b) പ്രകാശസംശ്ലേഷണത്തിന് ശേഷം ഉൽപാദിപ്പി ക്കുന്ന ഗ്ലൂക്കോസ് നിരവധി ഉപാപചയ പ്രവർ ത്തനങ്ങൾക്ക് വിധേയമാകുകയും, ഗ്ലൂക്കോസി നെ, അന്നജം അടങ്ങിയ കിഴങ്ങുവർഗ്ഗങ്ങൾ, പ്രോട്ടീൻ അടങ്ങിയ പയർവർഗ്ഗങ്ങൾ, കൊഴുപ്പ് അടങ്ങിയ എണ്ണ വിത്തുകൾ, ഫ്രക്ടോസ് അടങ്ങിയ പഴങ്ങൾ, സുക്രോസ് അടങ്ങിയ കരിമ്പ് തുടങ്ങി നിരവധി പോഷക സമ്പുഷ്ടമായ സ്രോതസ്സുകളായി പരിവർത്തനം ചെയ്യുകയും ചെയ്യുന്നു.

c) പ്രകാശസംശ്ലേഷണത്തിലൂടെ സസ്യങ്ങൾക്ക് സ്വന്തമായി ഭക്ഷണം ഉത്പാദിപ്പിക്കാൻ കഴിയു ന്നതുകൊണ്ടാണ് അവയെ സ്വപോഷികൾ എന്ന് വിളിക്കുന്നത്.

Kerala Syllabus Class 9 Biology Model Question Paper Set 1 Malayalam Medium

Question 20.
ഇനിപ്പറയുന്ന സൂചനകൾ ഉപയോഗിച്ച് മനുഷ്യ വിസർജ്ജന വ്യവസ്ഥയുമായി ബന്ധപ്പെട്ട ഭാഗങ്ങൾക്ക് പേര് നൽകുക.
a) വൃക്കകളിൽ കാണപ്പെടുന്ന അതിസൂക്ഷ്മ അരിപ്പകൾ
b) ബോമാൻസ് കാളിനുള്ളിലെ സൂക്ഷ്മ ലോമികാജാലം
c) വൃക്കകളിൽ നിന്ന് രക്തം കൊണ്ടുപോകുന്ന രക്തക്കുഴൽ
d) മൂത്രാശയത്തിലേക്ക് മൂത്രം കൊണ്ടുപോകുന്ന ഭാഗം.
Answer:
a) നെഫ്രോണുകൾ
b) ഗ്ലോമറുലസ്
c) വൃക്കാസിര
d) മൂത്രവാഹി

Kerala Syllabus Class 9 Physics Model Question Paper Set 1 Malayalam Medium

Students can practice with Kerala Syllabus 9th Standard Physics Question Paper Set 1 Malayalam Medium to familiarize themselves with the exam format.

Kerala Syllabus Std 9 Physics Model Question Paper Set 1 Malayalam Medium

സമയം: 1 1/2 മണിക്കൂർ
സ്കോർ : 40

നിർദ്ദേശങ്ങൾ

  • ആദ്യത്തെ 15 മിനിറ്റ് സമാശ്വാസ സമയമാണ്. ഈ സമയത്ത് ചോദ്യങ്ങൾ നന്നായി വായിച്ച് മനസ്സിലാക്കണം.
  • നിർദ്ദേശങ്ങൾക്കനുസരിച്ച് ഉത്തരം എഴുതുക.
  • ചോദ്യത്തിന്റെ സ്കോറും സമയവും പരിഗണിച്ച് ഉത്തരമെഴുതുക.

I. 1 മുതൽ 4 വരെയുള്ള ചോദ്യങ്ങളിൽ ഏതെങ്കിലും മൂന്നെണ്ണത്തിന് ഉത്തരം എഴുതുക. (1 സ്കോർ വീതം) (3 × 1 = 3)

Question 1.
4 kg മാസുള്ള ഒരു വസ്തു 4 m/s പ്രവേഗത്തിൽ നീങ്ങുന്നു. അതിന്റെ മൊമെന്റം എന്താണ്?
(16 kgm/s, 12 kgm/s, 24 kgm/s, 48 kgm/s)
Answer:
16 kgm/s

Question 2.
ഭൂമിയുടെ മധ്യഭാഗത്തുള്ള ‘9’ യുടെ മൂല്യം …………… ആണ്.
Answer:
പൂജ്യം

Kerala Syllabus Class 9 Physics Model Question Paper Set 1 Malayalam Medium

Question 3.
ഒന്നാം പദജോഡി ബന്ധം കണ്ടെത്തി രണ്ടാം പദജോഡി അനുയോജ്യമായി പൂരിപ്പിക്കുക.
പ്രവേഗം: m/s
ത്വരണം: ……………
Answer:
m/s2

Question 4.
ഉയർന്ന പ്രകാശിക സാന്ദ്രതയുള്ള ഒരു മാധ്യമത്തിൽ പ്രകാശവേഗം ……………….. ആയിരിക്കും.
Answer:
കുറവായിരിക്കും

II. 5 മുതൽ 13 വരെയുള്ള ചോദ്യങ്ങളിൽ ഏതെങ്കിലും ഏഴ് എണ്ണത്തിന് ഉത്തരം എഴുതുക. (2 സ്കോർ വീതം) (7 × 2 = 14)

Question 5.
ഭൂമിയിൽ ഒരു വസ്തുവിന്റെ ഭാരം 60 kg. wt. ആണ്. ചന്ദ്രനിൽ അതിന്റെ ഭാരം എത്രയാണ്? (gസ്കോർ = 1.62 m/s2)
Answer:
ചന്ദ്രനിലെ ഭാരം = \(\frac { 60 }{ 9.8 }\) × 1.62 = 9.918 kg.wt.

Question 6.
ചലന സമവാക്യങ്ങൾ എഴുതുക.
Answer:
v = u + at
S = ut + 1⁄2 at2
v2 = u2 + 2as

Question 7.
ചേരുംപടി ചേർക്കുക

പെരിസ്കോപ്പ് അന്തരീക്ഷത്തിലെ അപവർത്തനം
ജലത്തിൽ മുങ്ങിയിരിക്കുന്ന സ്ട്രോ അപവർത്തനം ഒടിഞ്ഞതായി പൂർണ്ണാന്തര പ്രതിപതനം
കാണപ്പെടുന്നു

Answer:

പെരിസ്കോപ്പ് പൂർണ്ണാന്തര പ്രതിപതനം
ജലത്തിൽ
മുങ്ങിയിരിക്കുന്ന
ഒടിഞ്ഞതായി
കാണപ്പെടുന്നു
അപവർത്തനം

Question 8.
ഒരു കാറും ലോറിയും ഒരേ പ്രവേഗത്തിലാണ് സഞ്ചരിക്കുന്നത്. ഏതിനാണ് കൂടുതൽ മൊമെന്റം? എന്തുകൊണ്ട്?
Answer:
ലോറിക്കാണ് കൂടുതൽ മൊമെന്റുമുള്ളത്.കാരണം, മാസ് കൂടുന്നതിനനുസരിച്ച് മൊമെന്റം വർദ്ധിക്കുന്നു.

Kerala Syllabus Class 9 Physics Model Question Paper Set 1 Malayalam Medium

Question 9.
20 kg മാസുള്ള ഒരു പന്തും 10 kg മാസുള്ള മറ്റൊരു പന്തും ഒരു ടവറിന്റെ മുകളിൽ നിന്ന് ഒരേസമയം വീഴുകയാണെങ്കിൽ, ഏതാണ് ആദ്യം തറയിൽ പതിക്കുക? എന്തുകൊണ്ട്?
Answer:
രണ്ട് പന്തുകളും ഒരേ സമയം തറയിൽ പതിക്കും. വസ്തുവിന്റെ മാസ് ഗുരുത്വാകർഷണത്വരണത്തെ ബാധിക്കുന്നില്ല എന്നതാണ് ഇതിന്റെ കാരണം.

Question 10.
നമ്മൾ ഒരു തറയിൽ നടക്കുമ്പോഴുള്ള ബലവും പ്രതിബലവും ഏതെന്നു എഴുതുക.
Answer:
നമ്മൾ ഒരു തറയിലൂടെ നടക്കുമ്പോൾ, നമ്മൾ തറയിൽ ഒരു പ്രയോഗിക്കുന്നു. പ്രതിബലം തറ എതിർദിശയിൽ ഒരു ബലം പ്രയോ ഗിക്കുന്നു.

Question 11.
ഭൂമിയുടെ മാസ് 6 × 1024 kg യും, ചന്ദ്രന്റെ മാസ് 7.4 × 1022 kg യും ആണ്. ഭൂമിയും ചന്ദ്രനും തമ്മിലുള്ള ദൂരം
3.84 × 105 km ആണ്. ആകർഷണബലം കണക്കാക്കുക.
(G = 6.7 × 10-11Nm2 kg2)
Answer:
M = 6 × 1024kg
m = 7.4 × 1022kg.
d = 3.84 × 105 km
F = \(\frac{G M m}{d^2}\)
= \(\frac{6.7 \times 10^{-11} \times 6 \times 10^{24} \times 7.4 \times 10^{22}}{\left(3.84 \times 10^5\right)^2}\)
= 20.17 × 1025 N

Question 12.
തന്നിരിക്കുന്ന സന്ദർഭങ്ങൾക്ക് അനുയോജ്യമായ നിയമം കണ്ടെത്തി എഴുതുക.
a) ഊതി വീർപ്പിച്ച ബലൂണിന്റെ അഗ്രം സ്വതന്ത്രമാക്കുമ്പോൾ വായുപ്രവാഹദിശക്ക് എതിർദിശയിൽ ബലൂൺ ചലിക്കുന്നു.
b) നിർത്തിയിട്ടിരിക്കുന്ന ബസ് പെട്ടെന്ന് മുന്നോട്ട് എടുക്കുമ്പോൾ യാത്രക്കാർ പിന്നിലേക്ക് വീഴുന്നു.
c) പോൾവാൾട്ട് ചാടുമ്പോൾ ഫോംബെഡിൽ വീഴുന്നതുമൂലം ആഘാതം കുറയുന്നു.
d) റോക്കറ്റിന്റെ അറകളിൽ നിന്ന് ഉന്നത മർദ്ദത്തിലുള്ള വാതകം പുറത്തേക്ക് പോകുന്നതിന്റെ ഫലമായി റോക്കറ്റ് കുതിക്കുന്നു.
Answer:
a) ന്യൂട്ടന്റെ മൂന്നാം ചലനനിയമം
b) ന്യൂട്ടന്റെ ഒന്നാം ചലനനിയമം
c) ന്യൂട്ടന്റെ രണ്ടാം ചലനനിയമം
d) ന്യൂട്ടന്റെ മൂന്നാം ചലനനിയമം

Question 13.
ഗ്ലാസിന്റെ അപവർത്തനാങ്കം 1.5 ആണ്. ശൂന്യതയിലെ പ്രകാശവേഗം 3 × 108 m/s ആണെങ്കിൽ, ഗ്ലാസിലെ പ്രകാശവേഗം കണ്ടെത്തുക.
Answer:
ഗ്ലാസിന്റെ അപവർത്തനാങ്കംn = 1.5
ശൂന്യതയിലെ പ്രകാശവേഗം, c = 3 × 108 m/s
ഗ്ലാസിലെ പ്രകാശവേഗം V= \(\frac { c }{ n }\) = \(\frac{3 \times 10^8}{1.5}\) = 2 × 108 m/s

III. 14 മുതൽ 19 വരെയുള്ള ചോദ്യങ്ങളിൽ ഏതെങ്കിലും അഞ്ച് എണ്ണത്തിന് ഉത്തരം എഴുതുക. (3 സ്കോർ വീതം) (5 × 3 = 15)

Question 14.
നിശ്ചലാവസ്ഥയിൽ നിന്ന് ആരംഭിക്കുന്ന ഒരു കാർ 3 സെക്കൻഡിനുള്ളിൽ 30 m/s പ്രവേഗം
കൈവരിക്കുന്നു.
a) കാറിന്റെ ത്വരണം കണക്കാക്കുക.
b) 3 സെക്കൻഡിനുള്ളിൽ ഉള്ള കാറിന്റെ സ്ഥാനാന്തരം കണ്ടെത്തുക.
Answer:
U= 0
v = 30 m/s
t = 3s
a) a = \(\frac { v-u }{ t }\) = \(\frac { 30-0 }{ 3 }\) = 10m/s2
b) s = ut + \(\frac { 1 }{ 2 }\) at2 = 0 × 3 + \(\frac { 1 }{ 2 }\) × 10 × 32 = 45m

Question 15.
ഭൂമിയുടെ ധ്രുവങ്ങളിലും ഭൂമധ്യരേഖയിലും കേന്ദ്രത്തിലും 1 kg മാസുള്ള ഒരു വസ്തു വച്ചിട്ടുണ്ട് എന്ന്കരുതുക.
a) ഈ വസ്തുവിന് ഏറ്റവും കൂടുതൽ ഭാരം അനുഭവപ്പെടുന്നത് എവിടെയാണ്?
b) ഏത് സ്ഥലത്താണ് ഈ വസ്തുവിന് ഏറ്റവും കുറഞ്ഞ ഭാരം അനുഭവപ്പെടുന്നത്?
c) നിങ്ങളുടെ ഉത്തരത്തെ ന്യായീകരിക്കുക.
Answer:
a) ധ്രുവങ്ങളിൽ.

b) ഭൂമധ്യരേഖയിലെ വസ്തുവിന്റെ ഭാരം ധ്രുവങ്ങളിലെ ഭാരത്തേക്കാൾ കുറവായിരിക്കും. ഭൂകേന്ദ്രത്തിലെ ഭാരം പൂജ്യമായിരിക്കും.
c) ഭാരം m × g, എന്നാൽ g = GM/R2 ഇവിടെ, R എന്നത് ഭൂമിയുടെ ആരം ആണ്. R കുറയുമ്പോൾ ഭാരം വർദ്ധിക്കുകയും വർദ്ധിക്കുമ്പോൾ ഭാരം കുറയുകയും ചെയ്യുന്നു. ഭൂമിയുടെ ആരം (R) എല്ലായിടത്തും ഒരുപോ ലെയല്ല, കാരണം ഭൂമിക്ക് ഒരു തികഞ്ഞ ഗോളാകൃതിയല്ല.

Question 16.
54 km/hr വേഗത്തിൽ സഞ്ചരിക്കുന്ന ഒരു കാറിൽ ബ്രേക്ക് പ്രയോഗിക്കുമ്പോൾ 35 ന് ശേഷം നിശ്ചലാവ സ്ഥയിലാകുന്നു. യാത്രക്കാർ ഉൾപ്പെടെ ഉള്ള കാറിന്റെ ഭാരം 1000 kg ആണെങ്കിൽ, ബ്രേക്ക് പ്രയോഗി ക്കുമ്പോൾ പ്രയോഗിക്കപ്പെടുന്ന ബലം എന്തായിരിക്കും?
Answer:
u = 54 km/h = \(\frac { 54 × 5 }{ 18 }\) = 15 m/s
t = 3s
m = 1000kg
v = 0
F = ma = m\(\left(\frac{\mathrm{v}-\mathrm{u}}{t}\right)\)
= 1000 × \(\left(\frac{0-15}{3}\right)\) = –\(\frac { 15000 }{ 3 }\) = -5000N

Kerala Syllabus Class 9 Physics Model Question Paper Set 1 Malayalam Medium

Question 17.
എന്തുകൊണ്ടാണ് നക്ഷത്രങ്ങൾ മിന്നിതിളങ്ങുന്നത്?
Answer:
നക്ഷത്രത്തിൽ നിന്ന് വരുന്ന ന്തരീക്ഷത്തിലൂടെ സഞ്ചരിച്ചാണ് നമ്മുടെ കണ്ണിൽ എത്തുന്നത്. അന്തരീക്ഷ പാളികളുടെ ഭൗതിക സാഹചര്യം (മർദ്ദം, താപനില തുടങ്ങിയവ നിരന്തരം മാറിക്കൊണ്ടിരിക്കുന്നു. അതിനാൽ കടന്നുവരുന്ന മാധ്യമത്തിന്റെ പ്രകാശികസാന്ദ്രതയും മാറിക്കൊണ്ടിരിക്കും. ഇതുകാരണം പ്രകാശരശ്മിക്ക് ക്രമരഹിതമായ അപവർത്തനം സംഭവിക്കുന്നു.

അതി നാൽ നിന്നുവരുന്ന പ്രകാശ കിരണങ്ങൾ പലതവണ ക്രമരഹിത അപവർത്ത നത്തിന് ശേഷം കണ്ണിൽ പതിക്കുമ്പോൾ നക്ഷത്രത്തെ ഒരേ സ്ഥാനത്ത് തുടർച്ചയായി കാണാൻ കഴിയുന്നില്ല. ഇതാണ് നക്ഷത്രത്തിന്റെ മിന്നിത്തിളക്കത്തിന് കാരണം.

Question 18.
ആവേഗമൊമെന്റതത്വം പ്രസ്താവിക്കുകയും തെളിയിക്കുകയും ചെയ്യുക.
Answer:
ബലത്തിന്റെ ആവേഗവും അതുണ്ടാക്കുന്ന മൊമെ നവ്യത്യാസവും തുല്യമായിരിക്കും. ഇതാണ് ആവേഗ മൊമെന്റതത്വം. ന്യൂട്ടന്റെ രണ്ടാം ചലന നിയമമനുസരിച്ച്,
F = \(\frac { mv – mu}{ t }\)
F × t = m (v-u)
F × t = mv – mu
i.e., ആവേഗം – മൊമെന്റവ്യത്യാസം
ഇതാണ് ആവേഗമൊമെന്റതത്വം.

Question 19.
നിശ്ചലാവസ്ഥയിൽ നിന്ന് ആരംഭിക്കുന്ന ഒരു വസ്തു 5 m/s എന്ന സമത്വരണത്തിൽ സഞ്ചരിക്കുന്നു. ഒരു മിനിറ്റിനുശേഷം വസ്തുവിനുണ്ടായ പ്രവേഗവും സഞ്ചരിച്ച ദൂരവും കണക്കാക്കുക.
Answer:
u = 0
a = 6m/s2
t = 1 minute = 60s
v = u + at = 0 + 6 × 60 = 360 m/s
s = ut + 1/2 at2 = 0 × 60 + 1/2 × 6 × 602 = 10800 m

IV. 20 മുതൽ 22 വരെയുള്ള ചോദ്യങ്ങളിൽ ഏതെങ്കിലും രണ്ടെണ്ണത്തിന് ഉത്തരം എഴുതുക. (4 സ്കോർ വീതം) (2 × 4 = 8)

Question 20.
കാരണം കണ്ടെത്തുക.
a) കരാട്ടെ അഭ്യാസി കൈകൾ വളരെ വേഗത്തിൽ ചലിപ്പിച്ചു കടുപ്പമുളള ഇഷ്ടികകൾ തകർക്കുന്നു.
b) ക്രിക്കറ്റ്ബോൾ പിടിക്കുമ്പോൾ ബോളിനൊപ്പം കൈ പുറകോട്ട് വലിക്കുന്നു.
c) ഓടി വരുന്ന അത്ലറ്റിന് ഫിനിഷിങ് ലൈനിൽ എത്തിയാലുടൻ ഓട്ടം അവസാനിപ്പിക്കാൻ കഴിയുന്നില്ല.
d) ഉരുണ്ടുവരുന്ന ഒഴിഞ്ഞ ടാർ വിപപിടിച്ചുനിർത്താൻ എളുപ്പമാണ്. എന്നാൽ ഉരുണ്ടു വരുന്ന ടാർ നിറച്ച വീപ്പയെ പിടിച്ചുനിർത്താൻ കൂടുതൽ പ്രയാസമാണ്.
Answer:
a) ഒരു വസ്തുവിൽ പ്രവർത്തിക്കുന്ന ബലം, അത് പ്രവർത്തിക്കാൻ സമയത്തിന് എടുക്കുന്ന വിപരീത അനുപാതത്തിലായിരിക്കും.അതാ യത്, സമയം കുറയുമ്പോൾ, ബലം വർദ്ധി ക്കുന്നു.

b) ഒരു വസ്തുവിൽ പ്രവർത്തിക്കുന്ന ബലം, അത് പ്രവർത്തിക്കാൻ എടുക്കുന്ന സമയത്തിന് വിപരീത അനുപാതത്തിലായിരിക്കും.അതാ യത് സമയം വർദ്ധിക്കുമ്പോൾ, ബലം കുറ യുന്നു.

c) ചലനജഡത്വം കാരണം

d) മാസ് കൂടുന്നതിനനുസരിച്ച് ജഡത്വം കൂടുന്നു.

Question 21.
a) അഭികേന്ദ്രത്വരണവും അഭികേന്ദ്ര ബലവും നിർവചിക്കുക. അവരുടെ ദിശ എന്താണ്?
b) വർത്തുള ചലനത്തിലുള്ള ചുറ്റികയ്ക്ക് അഭികേന്ദ്രബലം നഷ്ടപ്പെട്ടാൽ അതിന് എന്ത് സംഭവിക്കും?
c) 2 kg മാസുള്ള ഒരു ചുറ്റിക 2 m ആരമുള്ള വൃത്തപാതയിലൂടെ 2 m/s പ്രവേഗത്തിൽ വർത്തുളചലനത്തിന് വിധേയമാകുന്നു. അതിന്റെ അഭികേന്ദ്രബലം കണക്കാക്കുക.
Answer:
a) വർത്തുള പാതയിൽ സഞ്ചരിക്കുന്ന വസ്തുവിന്റെ ത്വരണമാണ് അഭികേന്ദ്രത്വരണം. ഈ ത്വരണത്തിന് ആവശ്യമായ ബലമാണ് അഭികേന്ദ്രബലം. അഭികേന്ദ്രത്വരണത്തിന്റെയും അഭികേന്ദ്രബലത്തിന്റെയും ദിശ ലേക്കായിരിക്കും.

b) അത് തൊടുവരയിലൂടെ തെറിച്ചുപോകുന്നു.

c) m = 2g,
v = 2 m/s
r = 2m
Fc = \(\frac{m v^2}{r}\) = \(\frac{2 \times 2^2}{2}\) = 4N

Question 22.
a) ക്രിട്ടിക്കൽ കോൺ നിർവചിക്കുക. ക്രിട്ടിക്കൽ കോണിനേക്കാൾ പതനകോൺ വർദ്ധിപ്പിച്ചാൽ, പ്രകാശപാതയിൽ എന്ത് മാറ്റം നിരീക്ഷിക്കാൻ കഴിയും?
b) 49,8 കോണിൽ ജലത്തിൽ നിന്ന് വായുവിലേക്ക് പ്രവേശിക്കുന്ന പ്രകാശരശ്മിക്ക് പൂർണ്ണാന്തര പ്രതിപതനം സംഭവിക്കുമോ? എന്തുകൊണ്ട്?
Answer:
a) പ്രകാശിക സാന്ദ്രത കൂടിയ മാധ്യമത്തിൽ നിന്ന് കുറഞ്ഞ മാധ്യമത്തിലേക്ക് പ്രകാശരശ്മി കടക്കുമ്പോൾ 90 ആകുന്ന സന്ദർഭത്തിലെ പതനകോൺ ആണ് ക്രിട്ടിക്കൽ കോൺ.ക്രിട്ടി കോണിനേക്കാൾ പതനകോൺ വർദ്ധിപ്പിച്ചാൽ, പ്രകാശരശ്മി പൂർണ്ണാന്തര പ്രതിപതനത്തിന് വിധേയമാകും, അതായത്, പ്രകാശരശ്മി അതേ മാധ്യമത്തിലേക്ക് പൂർണ്ണ മായും പ്രതിപതിക്കും.

b) 49.8° കോണിൽ ജലത്തിൽ നിന്ന് വായുവിലേക്ക് പ്രവേശിക്കുന്ന പ്രകാശരശ്മിക്ക് പൂർണ്ണാന്തര പ്രതിപതനം സംഭവിക്കും. പതനകോൺ ജ ത്തിന്റെ ക്രിട്ടിക്കൽ കോണിനേക്കാൾ കൂടു തലാണ് എന്നതാണ് ഇതിന്റെ കാരണം.

Kerala Syllabus Class 9 Physics Model Question Paper Set 5 English Medium

Teachers recommend solving Kerala Syllabus 9th Standard Physics Question Paper Set 5 to improve time management during exams.

Kerala Syllabus Std 9 Physics Model Question Paper Set 5 English Medium

Time: 1½ Hours
Max Score: 40 Marks

Instructions

  • The first 15 minutes are given as cool-off time. This time is to be spent reading and understanding the questions.
  • Answer the questions according to the directions.
  • Score and time to be considered while answering.

I. Answer any three questions from 1 to 4. (1 score each) (3 × 1 = 3)

Question 1.
Speed of light in a medium having low optical density will be ______
Answer:
Greater

Question 2.
Write the equation of motion connecting velocity and time.
Answer:
v = u+at

Question 3.
As mass increases, inertia ______
Answer:
increases

Question 4.
As the distance from the Earth to the object increases, the force of attraction exerted by the Earth (increases/decreases)
Answer:
decreases

II. Answer any seven questions from 5 to 13. (2 score each) (7 × 2 = 14)

Question 5.
During summer season there seenis to be water logging on roads when viewed from a distance. What may be the reason?
Answer:
During summer season the layers of air closer to the road have a low optical density as it is warmer than the upper layers. The optical density of the air increases gradually as we go higher. When light rays coming from the surrounding objects pass through different layers of as with different optical densities. they undergo refraction and then total internal reflection. Such deviated light rays fall on our eyes. Hence their image appears to have formed on roads This phenomenon is known as mirage Such familiar images are usually seen on the surface of water That ‘s why water seems to be logged on roads wthen viewed from a distance.

Kerala Syllabus Class 9 Physics Model Question Paper Set 5 English Medium

Question 6.
Draw position. time graph

Time(s) 0 1 2 3 4
Position(m) 0 5 10 15 20

Answer:
Kerala Syllabus Class 9 Physics Model Question Paper Set 5 English Medium Img 1

Question 7.
Deflate a balloon and release it suddenly. What happens?
Answer:
Release of air causes the balloon to move in the opposite direction. Releasing air from the balloon is taken as action and the movement of the balloon is taken as reaction.

Question 8.
a)Which of the following figure represents the critical angle?
Kerala Syllabus Class 9 Physics Model Question Paper Set 5 English Medium Img 2
b) What do you mean by critical angle?
Answer:
a) Figure (5)
b) When a ray of light enters from an optically denser medium to a rarer medium, the angle of incidence at which the angle of refraction becomes 90° is the critical angle.

Question 9.
a) What Is meant by momentum?
b) Write down the equation for calculating momentum.
Answer:
a) The measurement of the quantity of motion of a body is called momentum.
b) Momentum p = mv

Question 10.
a) Define circular motion.
b) What is the relation between centripetal force and centripetal acceleration?
Answer:
a) The motion of an object through a circular path is said to be circular motion.
b) The force required to produce centripetal acceleration is centripetal force.

Question 11.
A car came to rest when brake was applied for 4s to get a retardation of 3m/s2. Calculate how far the car would have travelled after applying the brake.
Answer:
a = -3 m/s2 (retardation = negative acceleration) t = 4s
v = 0
v = u + at
-u = -3 × 4 + 0
u = 12 m/s
Displacement of the car,
s = ut + 1/2 at2
= (12 × 4) + (1/2) (-3) × 16
= 24 m

Question 12.
If a tennis ball (mass 58.5 g) and a cricket ball (mass 163 g) are to reach a certain distance when hit with a cricket bat, which is to be hit with greater force Why?
Answer:
The cricket ball. As mass increases, inertia also increase.

Question 13.
Suppose if the body is moved from the surface of the earth to the centre. What happens? Why?
Answer:
When it reaches the centre attractive force becomes zero. When a body is placed at the centre of the earth, it is attracted towards all directions. Therefore the resultant force of attraction at the centre is zero.

III. Answer any five questions from 14 to 19. ( 3 score each) (5 × 3 = 15)

Question 14.
Examine the graph and answer the following questions.
Kerala Syllabus Class 9 Physics Model Question Paper Set 5 English Medium Img 3
a) Is the motion of the object uniform/non uniform?
b) Say whether the acceleration from O to A is uniform? What about from A to B?
Answer:
a) Non- uniform
b) O→A : Uniform acceleration
A→B : Uniform retardation

Kerala Syllabus Class 9 Physics Model Question Paper Set 5 English Medium

Question 15.
a) Why does a freely falling body experience weightlessness?
b) Drill a hole at the bottom of an open bottle and fill it with water. Water goes out through the hole.
Then allow the bottle to fall freely. What do you observe? Why?
Answer:
a) During falling, the entire force of gravity is utilised to give acceleration for the body. So a freely falling body experience weightlessness.

b) While falling, water will not go out through the hole. During free fall, water and the bottle possess some acceleration. Gravitational force of attraction is utilized to give acceleration to the body.

Question 16.
A car is moving with a uniform velocity of lo rn/s. It is brought to rest by applying brake uniformly for 2 s.
a) Is there acceleration or retardation? Calculate.
b) What is the displacement of car during this time interval?
Answer:
a) There is retardation
u = 10 m/s, t = 2 s, v = 0
a = \(\frac{v-u}{t}\)
a = \(\frac{0-10}{2}\) = -5m/s2
Retardation = 5m/s2

b) S = ut + \(\frac{1}{2}\)at2
= 10 × 2 + \(\frac{1}{2}\) ×(-5 × 22)
= 20 – 10 = 10m

Question 17.
Ray diagram showing the path of light through mediums A and B is given.
Kerala Syllabus Class 9 Physics Model Question Paper Set 5 English Medium Img 4
a) In which medium will the speed of light be less – A or B?
b) Which will be the optically denser medium? Justify your answer.
Answer:
a) Speed of light will be less in medium B.

b) B is the optically denser medium. Here, when light enters from A to B. the light ray deviates towards the normal It happens when light enters from an optically rarer medium to a denser medium. So B will be the optically denser medium.

Question 18.
A truck of mass 1000 kg moves with a velocity of 12 m/s. Within a small Interval of the time the velocity becomes 10 m/s.
a) What is the initial momentum of the lorry?
b) What is its final momentum?
C) What is the change in momentum?
Answer:
u = 12 m/s, v = 10 m/s, m = 1000 kg
a) Initial momentum
p = mu = 1000 × 12 = 12000 kg m/s

b) Final momentum
p = mv = 1000 × 10 = 10000 kg m/s

c) Change in momentum = mv – mu = 10000 – 12000 = – 2000 kg m/s

Question 19.
Write down instances where the force of gravity is fell.
Answer:

  • Mango falling down form a mango tree.
  • Stone which is thrown upwards comes back to the ground.
  • Raindrops fall downwards.
  • When we open the bottle filled with water and keep it upside down, water flows out.
  • An object in our hands falls down when it is released.

III. Answer any two questions from 20 to 22. (4 score each) (2 × 4 = 8)

Question 20.
Figure shows the path of the light from a laser torch that passes through water taken in beaker.
Kerala Syllabus Class 9 Physics Model Question Paper Set 5 English Medium Img 5
a) Explain the phenomenon responsible for the deviation of the path of light.
b) What is meant by optical density?
C) What Is the relation between optical density and velocity of light?
d) Arrange the following media in the descending order of their optical density.
(glass, water, diamond, air)
Answer:
a) Refraction-When a ray of light entering obliquely from one transparent medium, to another, its path undergoes a deviation at
the surface of separation. This is refraction.

b) Ability of a medium to influence the velocity of light is called optical density.

C) Invesely proportional

d) Diamond >Glass>Water>Air

Question 21.
Data about the motion of a bus which move in straight line given in the table

Time 0 5 10 15 20 25
Velocity(m/s) 10 10 10 10 10 10

a) Draw velocity – time graph
b) Calculate the displacement between lOs and 20 5.
c) Velocity of the bus is ______
(uniform) non uniform)
d) What is the acceleration of the bus?
Answer:
Kerala Syllabus Class 9 Physics Model Question Paper Set 5 English Medium Img 6
b) Displacement between 10 s and 20 s
s = Area of rectangle ABCD
= AB × AD
= 10 × 10 = 100m

c) Uniform

d) Zero
If an object moves in a straight line with uniform velocity, it has no acceleration.

Question 22.
a) Give two examples for impulsive force.
b) Why does the gun recoil while shot is fired?
c) We can not walk along mossy surface. Why?
Answer:
a) Batting the cricket ball
Striking a nail on a wall

b) The gun recoils due to the reaction force applied by the shot to the gun.

C) Absence of reaction force is the cause for this.

Kerala Syllabus Class 9 Physics Model Question Paper Set 3 English Medium

Teachers recommend solving Kerala Syllabus 9th Standard Physics Question Paper Set 3 to improve time management during exams.

Kerala Syllabus Std 9 Physics Model Question Paper Set 3 English Medium

Time: 1½ Hours
Max Score: 40 Marks

Instructions

  • First 15 minutes is given as cool off time. This time is to be spent for reading and understanding the questions.
  • Answer the questions according to the directions.
  • Score and time to be considered while answering.

I. Answer any three questions from 1 to 4. (1 score each) (3 × 1 = 3)

Question 1.
Which phenomenon of light is used in optical fibres that are used for communication?
Answer:
Total internal reflection

Question 2.
Identify the relation between the first pair and complete the second
Momentum: m × v; Impulse: _____
Answer:
Ft

Kerala Syllabus Class 9 Physics Model Question Paper Set 3 English Medium

Question 3.
If a car starts from rest, what is its initial velocity (U)?
Answer:
0

Question 4.
Observe the instruments A and B shown in the figure.
Kerala Syllabus Class 9 Physics Model Question Paper Set 3 English Medium Img 1
Among these which is used to measure mass? (Instrument A, Instrument B)
Answer:
Instrument A

II. Answer any seven questions from 5 to 13. (2 score each) (7 × 2 = 14)

Question 5.
Match the following.
Kerala Syllabus Class 9 Physics Model Question Paper Set 3 English Medium Img 2
Answer:
Kerala Syllabus Class 9 Physics Model Question Paper Set 3 English Medium Img 3

Question 6.
A car of 1000 kg moves with a velocity of 20 m/s. On applying brakes, it comes to rest in 5 s.
a) What is its initial momentum?
b) What is its final momentum?
Answer:
a) Initial momentum = mu = 1000 × 20
= 20000 kg m/s

b) Final momentum = mv = 1000 × 0
= 0 m/s

Question 7.
The refractive index of diamond is 2.42. What do you mean by this? Calculate the speed of light through diamond.
Answer:
Light travels through the air with a velocity 2.42 times the velocity of light through a diamond.
v = \(\frac { c }{ n }\) = \(\frac{3 \times 10^n}{2.42}\) = 1.24 × 108 m/s

Question 8.
Write an activity to prove inertia of rest.
Answer:
Make a pile of coins on a table. Strike off the lowest coin with a knife quickly. Only that particular coin is thrown off, and the others remain in the previous manner. This is due to the tendency of coins to remain in their state of rest.

Question 9.
A car starts from rest and covers 20 m in 2s. Calculate the acceleration of the car.
Answer:
u = 0
s = 20 m
t = 2 s
s = ut + 1/2 at2
20 = 0 × 4 + 1/2 × a × 22
20 = 2a
a = 10 m/s2

Kerala Syllabus Class 9 Physics Model Question Paper Set 3 English Medium

Question 10.
The mass of a body is 10 kg. Find the weight of the body if it is placed on the surface of ‘Jupiter’. (Value of g at Jupiter, g = 23.1 m/s2)
Answer:
Weight = mg
Weight = 10 × 23.1 = 231 N

Question 11.
When we place a glass slab on the letters in a textbook, the letters appear raised. What may be the reason?
Answer:
The ray of light coming from the letters undergoes refraction through the glass slab and reaches the eye. So the letters appear raised.

Question 12.
a) The weight of a freely falling body is zero. Why?
b) What do you mean by free fall?
Answer:
a) The weight of a freely falling body is zero because the entire force of gravity is used to provide acceleration to the body.
b) If an object is allowed to fall freely from a height, it will fall to the ground only under the gravitational force of the Earth. Such a motion is called free fall.

Question 13.
The velocity-time graph of a moving car is given below.
Kerala Syllabus Class 9 Physics Model Question Paper Set 3 English Medium Img 4
a) Find the acceleration of the car from A to B.
b) Which part of this graph represents the deceleration of the car?
Answer:
a) 0 (From A to B the car has uniform velocity, so no acceleration takes place)
b) BC

III. Answer any five questions from 14 to 19. (3 score each) (5 × 3 = 15)

Question 14.
A ray of light travels from air to a glass slab is depicted below. Observe the figure and answer the questions.
Kerala Syllabus Class 9 Physics Model Question Paper Set 3 English Medium Img 5
a) Find out the incident ray.
b) Find out the refracted ray.
c) What is the angle of incidence?
d) What is the angle of refraction?
e) What happens when a ray of light obliquely travels from air to a glass slab?
f) Name this phenomenon of light.
Answer:
a) PQ
b) QR
c) 30°
d) 19°
e) It bend towards the normal (refraction takes place)
f) Refraction

Question 15.
An object starting from rest travels with a uniform acceleration of 8 m/s2. Calculate the velocity and distance travelled after 40 s.
Answer:
u = 0
a = 8 m/s2
t = 40 s
v = u + at = 0 + 8 × 40 = 320 m/s
s = ut + 1/2 at2
= 0 × 40 + 1/2 × 8 × 402
= 6400 m

Question 16.
Give reasons for the following.
a) Accidents that happen to passengers who do not wear seat belts are more fatal.
b) At the time of catching a cricket ball, the time of catching is extended by moving the hand backwards with the ball.
c) Action and reaction do not cancel each other.
Answer:
a) It is due to inertia of motion. In moving vehicle, the passengers are also in the state of motion. When the vehicle is suddenly stopped the passengers have the tendency to move forward and hit on the body of vehicle that causes accident more fatal if they do not wear seat belt.

b) It is to reduce impulsive force, thereby reducing the momentum and impact on our hand.

c) Action and reaction are equal and opposite but they never cancel each other because they act on different objects.

Question 17.
A ball thrown vertically upward reached a maximum height of 20 m.
a) What was the velocity of the stone at the instant of throwing up?
b) How much time did the ball take to reach the height of 20 m ?
Answer:
a) v2 = u2 + 2as
u2 = v2 – 2as
u2 = 02 – 2× -10 × 20
u2 = 400
u = 20 m/s

b) v = u + at
t = \(\frac { v-u }{ a }\) = \(\frac { 0-20 }{ -10 }\) = 2s

Kerala Syllabus Class 9 Physics Model Question Paper Set 3 English Medium

Question 18.
State true or false.
a) The value of G is constant everywhere in the universe.
b) The value of g is constant everywhere in the universe.
c) The weight of an object is constant everywhere in the universe.
Answer:
a) True
b) False
c) False

Question 19.
The refractive index of different mediums is given in the table.

Medium Refractive index
Crown glass 1.52
Glycerine 1.47
Sunflower oil 1.47
Water 1.33
Flint glass 1.62

a) In which medium does light travel with maximum speed?
b) Will a ray of light entering obliquely from glycerine to sunflower oil deviate? Explain the reason.
c) Light is transmitted from glass to each medium listed in the table above. If the light is incident at an angle of 30°, which medium will have the largest angle of refraction? Why?
Answer:
a) In water

b) No. As the speed of light is the same in both these mediums (as the refractive index of both mediums is the same), light does not undergo refraction.

c) In water. Among these, water has the least refractive index.

IV. Answer any two questions from 20 to 22. (4 score each) (2 × 4 = 8)

Question 20.
Justify the statements.
a) While bow fishing, one should aim at a point below the perceived position of the fish.
b) The bottom of the aquarium is seen above the surface of the water.
Answer:
a) When the reflected light coming from the fish enters from an optically denser medium (here water) to a rarer medium(air), it deviates away from the normal at the surface of separation. This refracted light appears to come from a position just above the actual position. This is why it is advised to aim at a point below the perceived position of the fish.

b) The light coming from the bottom of the aquarium undergoes internal reflection at the surface of water. Hence, the bottom is seen above the surface of water. The distance from the surface of water to the bottom of the aquarium is the same as the – distance from the surface to the image caused by total internal reflection.

Question 21.
Observe the given graphs.
Kerala Syllabus Class 9 Physics Model Question Paper Set 3 English Medium Img 6
a) Which among the graphs represents the body at rest?
b) The other graph represents _____ (uniform acceleration / uniform velocity)
c) What is the velocity of the body shown in graph (i)?
d) How much will be the acceleration for the body represented by graph (ii)?
Answer:
a) graph(1)
b) uniform velocity
c) Zero (because the body is at rest)
d) Zero (because the body is in uniform velocity, it has no acceleration)

Question 22.
A body of mass 10 kg is taken to different parts of the Earth.
a) What is its mass at the centre of the earth?
b) Where does it have maximum weight?
c) At which part on the surface of the earth is the weight minimum?
d) In your opinion, what is the cause of this difference in weight?
Answer:
a) 10 kg
b) At poles
c) At equatorial places
d) As the radius of the earth (R) changes, the value of g\(\left(g=\frac{G M}{R^2}\right)\) changes and, weight (w = mg) changes.

Kerala Syllabus Class 9 Physics Model Question Paper Set 2 English Medium

Teachers recommend solving Kerala Syllabus 9th Standard Physics Question Paper Set 2 to improve time management during exams.

Kerala Syllabus Std 9 Physics Model Question Paper Set 2 English Medium

Time: 1½ Hours
Max Score: 40 Marks

Instructions:

  • First 15 minutes is given as cool off time. This time is to be spent for reading and understanding the questions.
  • Answer the questions according to the directions.
  • Score and time to be considered while answering.

I. Answer any three questions from 1 to 4. (1 score each) (3 × 1 = 3)

Question 1
Give one example for atmospheric refraction.
Answer:
Twinkling of stars

Question 2.
The unit of impulse is ___________
Answer:
Ns

Question 3.
What would be the weight of a body of mass 50kg when placed at the centre of the earth?
Answer:
Zero

Kerala Syllabus Class 9 Physics Model Question Paper Set 2 English Medium

Question 4.
The area under a velocity-time graph gives _________
(Velocity. displacement. distance, time)
Answer:
Displacement

II. Answer any seven questions from 5 to 13. (2 score each) (7 × 2 = 14)

Question 5.
An object starting from rest travels with an acceleration of 6 m/s2.What will be its velocity after 8s?
Answer:
u = 0,
a = 6 m/s2, t = 8s
v = u + at
v = 0 + 6 × 8
v = 48 m/s

Question 6.
Is it dangerous for loaded vehicles to negotiate a curve in the road without reducing speed? What is the reason?
Answer:
Yes. This is because loaded vehicles possess more inertia of motion. As mass increases, inertia also increases.

Question 7.
The bottom of a pond appears elevated when viewed from a distance than from a nearer point. Why?
Answer:
When the light coming from the bottom of the pond enters from an optically denser medium to a rarer medium, it deviates away from the normal. As the distance between the pond and the observer increases, the angle of refraction made by the incident ray increases. So the bottom of a pond appears elevated.

Question 8.
If a stone of mass 10 kg and another of mass 5 kg fall down simultaneously from the top of a building. Which one will reach the ground first? Why?
Answer:
Reach at the same time Acceleration due to gravity g = \(\frac{G M}{R^2}\) does not depend on mass of the body.

Question 9.
What are the two conditions required for total internal reflection to occur?
Answer:
The conditions required for total internal reflection to occur are
a) The ray should enter from an optically denser medium to a rarer medium.
b) The angle of incidence should be greater than the critical angle.

Question 10.
Rockets are used to launch artificial satellites.
a) State the law of motion related to the rocket launching.
b) Write down some examples for this law.
Answer:
a) For every action there is an equal and opposite reaction
b) When a man jumps from a boat to the shore, the boat moves backward.
When a bullet is fired from a gun the gun recoils.

Question 11.
A car is moving with a uniform velocity of 20 m/s. It is brought to rest by applying brake uniformly for 5s.
a) What is the retardation of the car?
b) What is the displacement of the car during this time interval?
Answer:
a) u = 20 m/s, t = 5 s, v = 0 m/s
a = (v-u)/t = (0 – 20)/5 = (-20)/5
a = -4 m/s2

b) s = ut + 1/2 at2
s = 20 × 5 + 1/2 × – 4 × 25
s = 100 -50 = 50 m

Question 12.
Explain how optical fibres make use of the property of total internal reflection
Answer:
Light rays from the source travel through the fibre. While travelIng through the fibre, it makes an angle of incidence greater than the critical angle with the walls of the fibre Hence the light undergoes successrve total internal reflection and emerges through the other end.

Question 13.
The force of attraction between two persons was not experienced in everyday life Why?
Answer:
The force of attraction between two persons is not felt because it is very feeble. This force is very small that it cannot even be compared to other forces like frictional force, magnetic force, etc. Therefore, this force is not experienced In everyday life.

III. Answer five questions from 14 to 19. (3 score each) (5 × 3 = 15)

Question 14.
State if the following statements are right or wrong and correct the wrong statements
a) We can see the apparent position of the Sun just before and just after the actual Sunrise and actual Sunset due to atmospheric refraction.
b) A ray incident normally at the surface of separation of mediums undergoes refraction.
c) As the refractive index inŒeases, the speed of light increases.
Answer:
a) Right

b) wrong
Corrected statement: A ray incident normally at the surface of separation of mediums undergoes no refraction.

C) Wrong
Corrected statement As refractive index increases, speed of light decreases.

Kerala Syllabus Class 9 Physics Model Question Paper Set 2 English Medium

Question 15.
Give reasons
a) When a bullet is fired from a gun. the gun recoils.
b) When a bus at rest suddenly moves Forward, the passengers, standing lithe bus fall backwards.
C) We slip on a mossy surface.
Answer:
a) The gun recoils due to the reaction force applied by the shot to the gun. Forward movement of the shot Is action and the backward movement of the gun is reaction.
b) Inertia of rest is the reason. The passengers tends to continue in the state of rest.
c) The absence of reaction force is the cause for this.

Question 16.
The mass and weight of a body is determined at the pole and at the equator
a) Is there any difference in the mass?
b) Is there any change in the weight?
C) Justify the answer.
Answer:
a) No change in mass
b) Yes. Chan9e will occur
C) Mass is the quantity of matter present In a body.
Value of g is greater at the poles and lesser at the equator. So weight varies. Value of g does not affect the mass.

Question 17.
a) Draw the velocity-time graph based on the table.

Time(s) 0 5 10 15 20
Velocity (m/s) 20 20 20 20 20

b) Find out the displacement between 10 s and 20 s from the graph.
Answer:
a)Kerala Syllabus Class 9 Physics Model Question Paper Set 2 English Medium Img 1
b) Displacement = Area of rectangle = length × breadth = 20 × 10 = 200 m

Question 18.
A loaded lorry of mass 1500 kg moves with a velocity of 12 m/s. Within a small interval of time, the velocity becomes 10 m/s.
a) What is the initial momentum of the lorry?
b) What is its final momentum?
c) What is the expression for change in momentum?
Answer:
a) Initial momentum p = mv1, m = 1500 kg
v1 = 12 m/s
mv1 = 1500 × 12 = 18000 kgm/s

b) Final momentum p = mv2
v2 = 10 m/s
p = 1500 × 10
= 15000 kgm/s

c) Expression for change in momentum = mv2 – mv1

Question 19.
The mass of an object is 100 kg. Calculate its weight at the centre of the Earth, the polar region, the equatorial region, the Moon. and the Jupiter (g on the Jupiter 23.1 m/s2)
Answer:
m = 100 kg
At the centre, w = mg = 100 × 0 = 0N
At the poles, w = mg = 100 × 9.83 = 983 N
At the equator, w = mg = 100 × 9.78 = 978 N
On Moon, w = mg = 100 × 1.62 = 162 N
On Jupiter, w = mg = 100 × 23.1 = 2310 N

IV. Answer any two questions from 20 to 22. (4 score each) (2 × 4 = 8)

Question 20.
Observe the figure. Light falling on two different media are shown.
Kerala Syllabus Class 9 Physics Model Question Paper Set 2 English Medium Img 2
a) Which medium has greater optical density? Through which medium will light pass through higher speed?
b) Why?
C) Which medium has greater refractive index?
d) What do you mean by refractive index of a medium?
Answer:
a) Medium 2 has greater optical density Through medium 1 light passes with higher speed.
b) Optical density is greater in the medium having less refracted angle.
c) Medium 2
Because medium 2 possess greater optical density.
d) Refractive index of a medium is the ratio of the speed of light in vacuum to the speed of light in the medium.

Kerala Syllabus Class 9 Physics Model Question Paper Set 2 English Medium

Question 21.
Observe the figures.
Kerala Syllabus Class 9 Physics Model Question Paper Set 2 English Medium Img 3
a) In which figure the attractive force is greater?Why?
b) Calculate the attractive force in figure B.
Answer:
a) A
It is because comparing to figure B , the distance is less in figure A. The attractive force is inversely proportional to distance between the two attracting bodies.

b) m1 = 5 kg
m2 = 20 kg
d = 10 m
F = \(G \frac{m_1 m_2}{d^2}\)
F = \(\frac{6.67 \times 10^{-11} \times 5 \times 20}{10^2}\)
F = 6.67 × 10-11N

Question 22.
Motion of a car is show, below using a diagram.
Kerala Syllabus Class 9 Physics Model Question Paper Set 2 English Medium Img 4
a) What is the distance covered by the car between A and C?
b) Find the velocity of the car during this period.
c) Among the following which are the time interval where car travels in uniform velocity?
(Os → 2s, 2s→4s, 4s→6s,8s→10s)
Answer:
a) 25 m

b) Velocity = \(\frac{\text { Displacement }}{\text { Time }}\)
Velocity = \(\frac { 25 }{ 4 }\) = 6.25 m/s

c) 0 s → 2s, 4s → 6s, 8 s → 10 s

Kerala Syllabus Class 9 Physics Model Question Paper Set 1 English Medium

Teachers recommend solving Kerala Syllabus 9th Standard Physics Question Paper Set 1 to improve time management during exams.

Kerala Syllabus Std 9 Physics Model Question Paper Set 1 English Medium

Time: 1½ Hours
Max Score: 40 Marks

Instructions:

  • First 15 minutes is given as cool off time. This time is to b. spent for reading and understanding the questions.
  • Answer the questions according to the directions.
  • Score and time to be considered while answering.

I. Answer any three questions from 1 to 4. (1 score each) (3 × 1 = 3)

Question 1.
A body of mass 4 kg is moving with a velocity of 4m/s. What is its momentum?
(16 kgm/s, 12 kgm/s, 24 kgm/s, 48 kgm/s)
Answer:
16 kgm/s

Question 2.
Value of ‘g’ at the centre of the Earth is _____
Answer:
Zero

Kerala Syllabus Class 9 Physics Model Question Paper Set 1 English Medium

Question 3.
Identify the relation between the first pair and complete the second
Velocity : m/s
Acceleration : _____
Answer:
m/s2

Question 4.
Speed of light in a medium having high optical density will be _____.
Answer:
lower

II. Answer any Seven questions from 5 to 13. (2 score each) (7 × 2 = 14)

Question 5.
An object weighs 60 kg. wt. on the Earth. What is its weight on the Moon?
(gmoon = 1.62 m/s2)
Answer:
Weight on moon = \(\frac { 60 }{ 9.8 }\) × 162 = 9.918 kg.wt.

Question 6.
Write down equations of motion.
Answer:
v = u + at
s = ut + 1/2 at2
v2 = u2 + 2as

Question 7.
Match the following.

Twinkling of stars Total internal reflection
periscope Reflection and total internal reflection
Mirage Refraction
Straw in water appears bent Atmospheric refraction

Answer:

Twinkling of stars Atmospheric refraction
periscope Total internal reflection
Mirage Reflection and total internal reflection
Straw in water appears bent Refraction

Question 8.
A car and a lorry are travelling at the same velocity.
Which has greater momentum? Why?
Answer:
Lorry has greater momentum. This is because. as mass increases. momentum Increases.

Question 9.
II a ball of mass 20 kg and another ball of mass 10 kg fall simultaneously from the top of a tower, which one will reach the ground first? Why?
Answer:
Both the balls will reach the ground at the same time. It is because the acceleration due to gravity does not depend on the mass of the body.

Question 10.
Write down the action and reaction while we are walking on a floor?
Answer:
Action – When we are walking on a floor, we apply a force on the floor.
Reaction – The floor applies a force n the opposite direction.

Question 11.
The massof the Earth is 6 × 1024kg, and that of the Moon is 7.4 × 1022kg. The distance between Earth and. Moon is 3.84 × 105 km. Calculate the force of attraction. (G = 6.7 × 10-11 Nm2 kg-2)
Answer:
M = 6 × 1024kg
m = 7.4 × 1022kg
d = 3.84 × 105km
F = \(\frac{G M m}{d^2}\)
= \(\frac{6.7 \times 10^{-11} \times 6 \times 10^{24} \times 7.4 \times 10^{22}}{\left(3.84 \times 10^5\right)^2}\)
= 20.17 × 105N

Question 12.
Find out the appropriate law for the given situations.
a) When the tip of an inflated bauoon is released, the balloon moves in a direction opposite to the direction of motion of air.
b) When a bus moves forward suddenly from rest, the standing passengers tend to fall back.
c) During a pole wait jump, the impact is reduced by falling on the foam bed.
d) Gas at high pressure pushed out from the chambers of rocket causes rocket propulsion.
Answer:
a) Newton’s third law of motion
b) Newton’s first law of motion
c) Newton’s second law of motion
d) Newton’s third law of motion

Kerala Syllabus Class 9 Physics Model Question Paper Set 1 English Medium

Question 13.
The refractive index of glass is 1.5. If the speed of light in vacuum is 3 × 108 m/s, find speed of light in glass.
Answer:
Refractive Index of glass n = 1 .5
Speed of light in vacuum = 3 × 108 m/s
Speed of light in glass,
v = \(\frac { c }{ n }\) = \(\frac{3 \times 10^8}{1.5}\) = 2 × 108 m/s

III. Answer any five questions from 14 to 19. (3 score each) (5 × 3 = 15)

Question 14.
A car starting from rest attains a velocity of 30 m/s within 3 s.
a) Calculate the acceleration of the car.
b) Find displacement of the car within 3 s.
Answer:
u = 0
v = 30 m/s
t = 3s
a) a = \(\frac{v-u}{t}\) = \(\frac{30-0}{3}\) = 10m/S2

b) S = Ut + \(\frac{1}{2}\)at2 = 0 × 3 + \(\frac{1}{2}\) × 10 × 32 = 45m

Question 15.
Assume that a body of mass 1 kg is kept at the poles, equator and centre of the Earth.
a) In which place does this body experience maximum weight?
b) In which place does this body experience minimum weight?
c) Justify your answer.
Answer:
a) At the poles.

b) Weight at equator will be less than that at poles.
Weight at the centre of Earth will be zero:

c) Weight = mxg, but g = GM/R2
Here, R is the radius of the earth. As R decreases, weight increases and as R Increases, weight decreases. Radius of earth (R) is not the same everywhere because earth is not a perfect sphere.

Question 16.
A car moving with a speed of 54 km/h comes to rest after 3s on applying brake. If the mass of the car, including the passengers, is 1000kg. What will be the force applied when the brake is applied?
Answer:
u = 54 Km/h = \(\frac{54 \times 5}{18}\) = 15m/s
t = 3s
m = 1000 kg
v = 0
F = ma = \(m\left(\frac{v-u}{t}\right)\)
= 1ooo × \(\left(\frac{0-15}{3}\right)\) = –\(\frac { 15000 }{ 3 }\) = -5000N

Question 17.
Why do stars appear to twinkle?
Answer:
The light coming from the stars reaches our eyes by traveling through the atmosphere. The optical density of the medium through which the light travels changes as the physical conditions (pressure, temperature etc.) of the layers of the atmosphere change continuously. Hence, the light undergoes an irregular refraction. Therefore, when the light rays from the stars reach the eyes after refracted several times, the star cannot be seen continuously at the same position. This is the reason for the twinkling of stars.

Question 18.
State and prove the impulse-momentum principle.
Answer:
The product of the force and the time is the impulse of the force. The impulse of force is equal to the change in momentum. This is the impulse-momentum principle. According to Newtons second law of motion.
F = \(\frac{m v-m u}{t}\)
F × t = m (v – u)
F × t = mv – mu
i.e. impulse = change in momentum
This is known as impulse – momentum principle.

Kerala Syllabus Class 9 Physics Model Question Paper Set 1 English Medium

Question 19.
An object starting from rest travels with a uniform acceleration of 6 m/s2. Calculate the velocity and distance travelled after 1 minute?
Answer:
u = 0
a = 6m/s2
t = 1 minute = 60s
y = u + at
= 0 + 6 × 60
= 360 m/s
s = ut + 1/2 at2
= 0 × 60 + 1/2 × 6 × 602
= 10800 m

IV. Answer any two questions from 20 to 22. (4 score each) (2 × 4 = 8)

Question 20.
Give reason.
a) Karate experts move their hands with great speed to break strong bricks.
b) While catching a cricket ball, the player moves his hands backwards along with the ball.
c) A running athlete cannot stop himself abruptly at the finishing line of a race.
d) It Is easy to stop a rolling empty drum but difficult to stop a rolling drum filled with tar.
Answer:
a) The force acting on a body will be inversely proportional to the time taken. That is, as time decreases, force increases.
b) The force acting on a body will be inversely proportional to the time taken. That is, as time increases force decreases.
c) Due to inertia of motion
d) As mass increases, inertia increases.

Question 21.
a) Define centripetal acceleration and centripetal force. What is their direction?
b) What happens to the hammer, which is under circular motion, if it loses the centripetal force?
c) A hammer of mass 2 kg is subjected to circular motion along a circular path of radius 2 m with a velocity of 2 m/s. Calculate its centripetal force.
Answer:
a) The acceleration experienced by an object in a circular motion, along the radius, towards the centre of the circle, is known as centripetal acceleration. The force that creates a centripetal acceleration is called centripetal force. Centripetal acceleration and centripetal force are directed towards the centre.

b) It will be thrown off along the tangent at that point.

c) m = 2kg.
v = 2m/s
r = 2m
Fc = \(\frac{m v^2}{r}\) = \(\frac{2 \times 2^2}{2}\) = 4N

Question 22.
a) Define critical angle. What change in the path of light will be observed if the angle of incidence is increased from critical angle?
b) Will total internal reflection occur for a ray of light entering from water to air at an angle of 49.8°? Why?
Answer:
a) Critical angle -when a ray of light enters from an optically denser medium to a rarer medium the angle of incidence at which the angle of refraction becomes 90° is the critical angle.
If the angle of incidence is increased from critical angle, then the ray will undergo total internal reflection, ie., the ray will be reflected back to the same medium.

b) Total internal reflection will occur for a ray of light entering from water to air at an angle of 49.8° because the angle of incidence is greater than the critical angle of water.

Kerala Syllabus Class 9 Biology Model Question Paper Set 5 English Medium

Teachers recommend solving Kerala Syllabus 9th Standard Biology Question Paper Set 5 to improve time management during exams.

Kerala Syllabus Std 9 Biology Model Question Paper Set 5 English Medium

Time: 1½ Hours
Max Score: 40 Marks

Instructions:

  • First 15 minutes is given as cool off time. This time is to be spend for reading and understanding the questions.
  • Answer the questions according to the directions.
  • Score and time to be considered while answering.

I. Answer any 4 from questions 1 to 5. Each carries 1 score (4 × 1 = 4)

Question 1.
Plants grow in water as well as on land. Who are the producers in the ocean and other water bodies?
Answer:
Aquatic plants include larger plants, or macrophytes, and microscopic algae, or phytoplankton. These are the primary producers in the ocean and other water bodies.

Question 2.
The small intestine involves mechanical processes, namely ……………….. and ………………… to help in
the movement of food and the blending of food with digestive fluids.
Answer:
Peristalsis and Segmentation

Question 3.
What is the function of the small intestine?
Answer:
The small intestine is responsible for the digestion and absorption of nutrients from food.

Kerala Syllabus Class 9 Biology Model Question Paper Set 5 English Medium

Question 4.
List the two major stages involved in cellular respiration.
Answer:

  • Glycolysis
  • Krebs cycle

Question 5.
Which are the two main categories of metabolic processes?
Answer:
The two main categories of metabolic processes are anabolism and catabolism.

II. Answer any 4 from questions 6 to 10. Each carries 2 score (4 × 2 = 8)

Question 6.
The exchange of oxygen from the air which has entered the alveolus into the blood, and the exchange of carbon dioxide into the alveolus from the blood is called the alveolar exchange of gases.’
a) What are the characteristic features of the walls of the alveolus and blood capillaries?
b) What is the importance of moisture in the wall of the alveolus?
Answer:
a) The walls of the alveoli are very thin, which makes it easier for oxygen and CO2 to pass between the alveoli and very small blood vessels (capillaries). Both are made up of a single layer of cells.

b) Moisture is important for gas exchange because, in order for oxygen and carbon dioxide to effectively cross the alveoli membrane, they must dissolve in an aqueous-like solution. With the right amount of moisture, gas exchange occurs properly.

Question 7.
Your school health club is conducting an awareness class on the topic ‘Bad habits and Health of the heart’. Mention any four points that to be included in the awareness class.
Answer:
Points to be included in the awareness class,

  • While some risk factors are uncontrollable (age, genetics), many lifestyle habits significantly influence heart health.
  • Excessive saturated and trans fats raise bad cholesterol, clogging arteries.
  • High sodium intake increases blood pressure, putting strain on the heart.
  • A sedentary lifestyle increases the risk of obesity, diabetes, and heart disease
  • Smoking increases the risk of blood clots and heart attacks. (Any four)

Question 8.
a) Name the scientist who explained the reactions in the dark phase of photosynthesis,
b) Complete the illustration by including the reactants and products of photosynthesis.
Kerala Syllabus Class 9 Biology Model Question Paper Set 5 English Medium 1
Answer:
a) Melvin Calvin
Kerala Syllabus Class 9 Biology Model Question Paper Set 5 English Medium 2

Question 9.
“Stomata remain open in the day time and closed at night.” Give the reason.
Answer:
Photosynthesis occurs during the day and thus stomata are open to supply the carbon dioxide required for the process. The stomatal openings remain closed at night as photosynthesis is not conducted without sunlight. They are closed to prevent water loss via the stomatal pores.

Kerala Syllabus Class 9 Biology Model Question Paper Set 5 English Medium

Question 10.
Complete the illustration related to photosynthesis suitably.
Kerala Syllabus Class 9 Biology Model Question Paper Set 5 English Medium 3
Answer:
i) Light Phase
ii) Water

III. Answer any 4 from questions 11 to 15. Each carries 3 scores (4 × 3 = 12)

Question 11.
Observe the figure and answer the following questions.
Kerala Syllabus Class 9 Biology Model Question Paper Set 5 English Medium 4
a) Why is the dialyis fluid removed from the dialysis unit in due course of time?
b) When is kidney transplantation required?
Answer:
a) If the dialysis fluid is not removed properly, it can cause swelling in blood vessels and increase your blood pressure, which makes your heart work harder. Too much fluid can build up in the lungs, making breathing difficult. Hemodialysis removes fluid as the blood is filtered through the dialysis machine.

b) Kidney transplantation is done when a person whose kidneys no longer function properly.

Question 12.
Observe the figure and answer the questions.
Kerala Syllabus Class 9 Biology Model Question Paper Set 5 English Medium 5
a) Which is the cell organelle?
b) Identify and write the parts A and B.
c) Name the two steps in the process of food formation (photosynthesis) that take place in chloroplasts?
Answer:
a) Chloroplast
b) A – Grana,
B – Stroma lamellae
c) Light phase, Dark phase.

Question 13.
A flowchart on the path of nutrients is given below. Observe it and answer the questions.
Kerala Syllabus Class 9 Biology Model Question Paper Set 5 English Medium 6
a) Name the blood vessels indicated by the letters A, B and C.
b) Do all the nutrients absorbed from the small intestine have the same path? Explain.
Answer:
a) A – Portal vein, B – Hepatic vein, C – Venacava

b) No. Nutrients like amino acids and glucdse are absorbed into the blood capillaries of the villus and are transported to the liver through the portal vein. Then they are carried to vena cava through hepatic vein. Substances like fatty acid and glycerol are absorbed by the lacteal of villus. They are carried to vena cava by lymph vessels. Vena cava carries all these nutrients to the heart.

Question 14.
a) Mention the role of haemoglobin in respiration.
b) Write any two healthy habits that can be followed to prevent anaemia.
Answer:
a) Haemoglobin is an iron-containing proteinaceous pigment which imparts red colour to the red blood cells (RBCs). Structurally haemoglobin can bind with respiratory gases like O2 and CO2 and it helps in the transportation of these gases to and from the cells.

b)

  • Eat foods rich in iron and B vitamins.
  • Eat fruits and vegetables high in vitamin C, which helps your body absorb iron.

Question 15.
The kidneys filter unwanted substances from the blood and produce urine to excrete them. There are three main steps for urine formation and these processes ensure that only waste and excess water are removed from the body.
a) What are the three main steps for urine formation?
b) Name the diseases that may caused due to abnormal amounts of glucose and calcium oxalate crystals in urine.
c) What are the major components of urine?
Answer:
a) Steps for urine formation,

  • Glomerular filtration (Ultrafiltration)
  • Reabsorption
  • Secretion

b) Abnormal amount of glucose – Diabetes Abnormal amount of Calcium oxalate crystals – Kidney stone

c) Water, urea, sodium chloride, potassium chloride, calcium salts, phosphate, uric acid, creatinine, etc. are’the components of urine.

Kerala Syllabus Class 9 Biology Model Question Paper Set 5 English Medium

IV. Answer any 4 from questions 16 to 20. Each carries 4 scores (4 × 4 = 16)

Question 16.
Prepare a short note on how hemodialysis is done.
Answer:
Hemodialysis is a process of filtering the blood of a person whose kidneys are not working normally. Hemodialysis helps control blood pressure and balance important minerals, such as potassium, sodium, and calcium, in your blood.

In this process, blood with a high quantity of waste materials is passed to the dialysis unit after adding heparin to prevent coagulation. When blood flows through the dialysis unit the waste materials in the blood diffuse into the dialysis fluid. This fluid is removed in due course. Antiheparin is added to the purified blood and is returned to the body.

Question 17.
One cardiac cycle is known as one heartbeat.
a) Which are the phases included in a cardiac cycle?
b) Why SA node is known as the pacemaker?
c) Expand ECG.
d) Define pulse.
Answer:
a)

  • Atrial systole
  • Ventricular systole
  • Joint diastole

b) It is the SA node in the wall of the right atrium that sends out the electrical signals that make the heart chambers contract. So, they are known as the Pacemaker.

c) Electrocardiogram (ECG)

d) The wave-like movement formed due to the contraction and relaxation of the heart is felt throughout the walls of the arteries is pulse.

Question 18.
Write the role of each of the following in the exchange of gases.
a) Plasma
b) RBC
c) Haemoglobin
d) Tissue fluid
Answer:
a) Plasma: The cells need oxygen for metabolism, which creates carbon dioxide as a waste product. The carbon dioxide is absorbed from the cells by the blood plasma (some of it binds to hemoglobin too) and is transported back to the lungs in the bloodstream.

b) RBC: Oxygen molecules attach to red blood cells, which travel back to the heart. At the same time, the carbon dioxide molecules in the alveoli are blown out of the body the next time a person exhales.

c) Haemoglobin: Haemoglobin is a molecule that is responsible for carrying almost all of the oxygen in the blood. It is composed of four subunits, each with a heme group and a globin chain. A single haemoglobin molecule can carry four 02 molecules along with the blood.

d) Tissue fluid: It is also called lymph or interstitial fluid helps to bring oxygen and nutrients to cells and to remove waste products from them.

Question 19.
Mangrove forests help in controlling Tsunamis to some extent.
a) Who is the Keralite environmental activist who made us aware of the ecological importance of mangrove forests?
b) What is the ecological importance of mangrove forests?
c) Mention any value-added product of the given economically important plant. Coconut tree –
d) List the economically important plants.
Answer:
a) Kallen Pokudan

b)

  • They are a repository of biodiversity.
  • They are a source of fish wealth.

c) Coconut tree – Coconut oil.

d)

  • Coconut
  • Rubber
  • Coffee plant
  • Tea plant

Kerala Syllabus Class 9 Biology Model Question Paper Set 5 English Medium

Question 20.
a) How does the food we swallowed enter the oesophagus properly without entering the trachea? Explain?
b) What do you mean by peristalsis?
c) What are the nutrients we get from food?
Answer:
a) The Tongue compresses the food into balls with the help of the palate. That time, Uvula closes the nasal cavity that opens to the pharynx and the trachea tilts up and it is closed by the epiglottis.

b) Peristalsis is the wave like movement of the oesophagus, stomach and intestines, that facilitates the movement of food through the digestive tract and helps to mix the food with digestive juices.

c) Carbohydrate, Protein, fat, Minerals, vitamins & water.

Kerala Syllabus Class 9 Biology Model Question Paper Set 4 English Medium

Teachers recommend solving Kerala Syllabus 9th Standard Biology Question Paper Set 4 to improve time management during exams.

Kerala Syllabus Std 9 Biology Model Question Paper Set 4 English Medium

Time: 1½ Hours
Max Score: 40 Marks

Instructions:

  • First 15 minutes is given as cool off time. This time is to be spend for reading and understanding the questions.
  • Answer the questions according to the directions.
  • Score and time to be considered while answering.

I. Answer any 4 from questions 1 to 5. Each carries 1 score (4 × 1 = 4)

Question 1.
Photosynthesis occurs within the _____________ cell organelles.
Answer:
Chloroplasts.

Question 2.
Name the first part of the small intestine.
Answer:
Duodenum

Question 3.
Which among the given animals is the odd one in connection with their excretory organ? Write the common features of others.
(Snake, Earthworm, Fish, Frog)
Answer:
Earthworms, others possess kidneys

Kerala Syllabus Class 9 Biology Model Question Paper Set 4 English Medium

Question 4.
Plants cannot store glucose, the product of photosynthesis as such. Which of the following is the reason for this?
• Glucose is soluble in water.
• Glucose is insoluble in water.
• Glucose can be converted into other forms.
• Glucose is an unstable compound.
Answer:
Glucose is soluble in water.

Question 5.
The exchange of gases occurs between the alveoli and blood capillaries by ____________ .
Answer:
By Simple diffusion.

II. Answer any 4 from questions 6 to10. Each carries 2 score (4 × 2 = 8)

Question 6.
Some situations in daily life are given below. Discuss how anaerobic respiration is beneficial in such situations and prepare short notes on the same.
a) Yeast is added to leaven the dough.
b) Curd is added to milk to prepare curd.
Answer:
a) Yeast is added to leaven the dough:
Yeasts ferment the sugar and produce carbon dioxide in this process. Fermentation is otherwise called anaerobic respiration. Production of carbon dioxide results in the leavening or rising of the dough to three times its original size.

b) Curd is added to milk to prepare curd:
A teaspoon of curd is added to milk contains the bacteria Lactobacillus. As the bacteria gets more lactose, it will produce lactic acid in the milk, converting the entire milk into curd.

Question 7.
Give reasons for each of the following.
a) Glucose and amino acids are not present in urine.
b) Differences in the diameters of afferent vessels and efferent vessels help in ultrafiltration.
Answer:
a) Essential materials such as glucose, amino acids, etc. formed after ultrafiltration are reabsorbed into the blood. So that they are not present in urine.
b) The afferent arteriole is larger in diameter than the efferent arteriole; This is to provide for the increased blood pressure in the glomerulus for ultrafiltration to take place.

Question 8.
Photosynthesis is the process by which plants make food. List the components required for photosynthesis.
Answer:

  • Chlorophyll
  • Sunlight
  • Water
  • Carbon dioxide

Question 9.
Observe the picture of chloroplast and answer the following.
Kerala Syllabus Class 9 Biology Model Question Paper Set 4 English Medium 1
a) What does ‘X’ indicate?
b) Write any two accessory pigments found in ‘X’.
Answer:
a) X – Grana
b) Chlorophyll b, Carotene, and Xanthophyll (Any two).

Kerala Syllabus Class 9 Biology Model Question Paper Set 4 English Medium

Question 10.
Describe the structure of the small intestine that aids in absorption.
Answer:
The small intestine is a long, coiled shape tube and has small diameter, maximizing its length for increased absorption. The inner wall is lined with finger-like projections called villi, which significantly increase the surface area for nutrient absorption.

III. Answer any 4 from questions 11 to 15. Each carries 3 scores (4 × 3 = 12)

Question 11.
The normal blood pressure of a healthy person is recorded as 120/80 mmHg. Blood pressure rising above this level is called hypertension and lowering from this level is called hypotension.’
What is the reason for variations of blood pressure? How does it affect the body? Find out.
Answer:
The normal rate of blood pressure is 120/ 80 mmHg. The disease condition in which the blood pressure increases above the normal rate is called hypertension. This happens due to many reasons like, unhealthy habits such as excess use of salt and fat, smoking, lack of exercise etc. The condition in which the blood pressure rate goes below the prescribed rate is called hypotension. These hypotension and hypertension may lead to stroke or heart attack.

Question 12.
Complete the table related to photosynthesis in plants.

Photosynthesis
Hints Light phase Dark phase
Place where reaction taken place
Reactions
Products

Answer:

PHOTOSYNTHESIS
Hints Light phase Dark phase
Place where the reaction takes place Grana Stroma
Reactions Water splits into hydrogen and oxygen Glucose is formed by combining hydrogen and carbon dioxide
Products Hydrogen, Oxygen, ATP Glucose, Water

Question 13.
Make corrections if any in the underlined portions of the following statements.
a) Glucose is converted into fructose and stored in oil seeds.
b) Glucose is transported to various parts of the plant body through phloem tubes.
c) Plants store glucose in the form of starch in the leaves.
d) Glucose is converted into protein and stored in fruits
Answer:
a) Fat
b) Sucrose
d) Fructose

Question 14.
Observe the figure and answer the following questions.
Kerala Syllabus Class 9 Biology Model Question Paper Set 4 English Medium 2
a) Identify the process.
b) Identify and write X and Y.
c) The peculiarities of X and Y are suitable for performing its functions effectively
Answer:
a) Alveolar gaseous exchange
b) X = Alveolus, Y = Blood capillary
c) The inner wall of the alveoli is always kept moist. The walls of the alveoli and capillaries are made up of a single layer of cells.

Question 15.
“In case of kidney failure, blood is purified by passing through artificial kidneys”.
Answer:
a) What is the name of this process?
b) Name the chemical substance used in this process.
c) Write the importance of this chemical substance.
Answer:
a) Haemodialysis.
b) Heparin.
c) Heparin prevents the clotting of blood.

Kerala Syllabus Class 9 Biology Model Question Paper Set 4 English Medium

IV. Answer any 4 from questions 16 to 20. Each carries 4 scores (4 × 4 = 16)

Question 16.
Redraw the diagram of chioroplast and answer the questions.
Kerala Syllabus Class 9 Biology Model Question Paper Set 4 English Medium 3
a) Name and label the parts according to the following hints.
Hints:
(i) The part where synthesis of glucose takes place.
(ii) The part where dissociation of water takes place.
b) Which are the phases of photosynthesis that take place in parts (i) and (ii)?
Answer:
Kerala Syllabus Class 9 Biology Model Question Paper Set 4 English Medium 4
b) (i) Stroma – Dark phase
(ii) Grana – Light phase

Question 17.
Redraw the diagram. Identify and label the parts mentioned below.
Kerala Syllabus Class 9 Biology Model Question Paper Set 4 English Medium 5
a) Living tissue which forms the tooth.
b) Part where blood vessels are present.
c) The hardest part of the tooth.
Answer:
a) Dentine
b) Pulp
c) Enamel

Question 18.
The biochemical process in which the cells of an organism obtain energy by combining oxygen and glucose, to release carbohydrates and energy is called respiration.
a) Prepare a short note on respiration in plants.
b) Does anaerobic respiration take place in human beings? Find out.
Answer:
a) Plants do not have a respiratory system or separate organs for the transport of gases. But they
have special features in leaf, stem, and root for the exchange of gases. The small pores on the surface of leaves and young stems are called stomata. Stomata remain open in the daytime and have special features in leaf, stem, and root for the exchange of gases. The small pores on the surface of leaves and young stems are called stomata. Stomata remain open in the daytime and close at night.

During the day photosynthesis and respiration take place simultaneously in the mesophyll cells of leaves. Since the rate of photosynthesis is high during the day, oxygen formed is used for respiration and the excess oxygen is expelled. CO2 formed as a result of respiration is utilized for photosynthesis and insufficient CO2 is received from the atmosphere. At night when stomata close, respiratory gas exchange occurs through diffusion.

Lenticels are the lens-shaped openings found on th§ surface of mature stems and roots. They also help in gaseous exchange in plants.

Plant roots have special cells that perform gaseous exchange with the air that is present in the soil particles.

b) Yes. In humans, aerobic respiration takes place in all cells as part of energy production in mitochondria. But in certain conditions, our cells lack oxygen to produce enough energy. For example, when we are doing strenuous exercises or something like that, our muscle cells lack oxygen. In such situations, muscle cells respire without oxygen which results in the production of lactic acid in cells.

Question 19.
Analyse the illustration and answer the following questions.
Kerala Syllabus Class 9 Biology Model Question Paper Set 4 English Medium 6
a) Identify the process given in the illustration.
b) Identify (i) and (ii).
c) In which circumstance, the formation of (i) takes place in the human body?
Answer:
a) Anaerobic respiration

b) (i) Lactic acid, (ii) Alcohol

c) When we are doing strenuous exercises or something like that, our muscle cells lack oxygen. In such situations, muscle cells respire without oxygen which results in the production of lactic acid in cells.

Kerala Syllabus Class 9 Biology Model Question Paper Set 4 English Medium

Question 20.
A Seminar on the topic ‘Health and Dental care’ is conducting in your school.
a) What are the main points to be included in the seminar regarding things to be taken care for proper dental care?
b) Prepare a poster regarding the topic.
Answer:
a) The most important things people can do to maintain good oral health are:

  • Brush your teeth twice a day
  • Flossing once a day removes plaque and food particles from between the teeth, where a brush, can’t reach ,
  • Schedule dental checkups and cleanings at least once a year.
  • Don’t use tobacco products
  • Drink plenty of water
  • Consider using mouthwash

Kerala Syllabus Class 9 Biology Model Question Paper Set 4 English Medium 7

Kerala Syllabus Class 9 Biology Model Question Paper Set 3 English Medium

Teachers recommend solving Kerala Syllabus 9th Standard Biology Question Paper Set 3 to improve time management during exams.

Kerala Syllabus Std 9 Biology Model Question Paper Set 3 English Medium

Time: 1½ Hours
Max Score: 40 Marks

Instructions:

  • First 15 minutes is given as cool off time. This time is to be spend for reading and understanding the questions.
  • Answer the questions according to the directions.
  • Score and time to be considered while answering.

I. Answer any 4 from questions 1 to 5. Each carries 1 score (4 × 1 = 4)

Question 1.
What are some examples of molecules that can easily pass through plasma membrane?
Answer:
Water, oxygen, and carbon dioxide

Question 2
……………….. is a calcium containing connective tissue that holds the tooth in the socket of the gum.
Answer:
Cementum

Question 3.
The double-layered membrane that surrounds and protects the heart.
Answer:
Pericardium

Question 4.
Complete the illustration suitably.
Kerala Syllabus Class 9 Biology Model Question Paper Set 3 English Medium 1
Answer:
Lactic acid.

Kerala Syllabus Class 9 Biology Model Question Paper Set 3 English Medium

Question 5.
Name the pores present at the tip of the grass leaves to eliminate excess water.
Answer:
Hydathodes.

II. Answer any 4 from questions 6 to 10. Each carries 2 score (4 × 2 = 8)

Question 6.
Differentiate between alveolar exchange and systemic exchange of gases.
Answer:
Alveolar exchange is the exchange of oxygen from the air which has entered the alveolus, into the blood and carbon dioxide into the alveolus from the blood.

Systemic gas exchange is the movement of respiratory gases between blood in systemic capillaries and systemic cells.

Question 7.
Anaerobic respiration takes place in human muscles under certain circumstances.
a. Give reason for this.
b. Name the product of this process.
Answer:
a) When oxygen availability decreases due to strenuous exercise or work, anaerobic respiration takes place in muscle cells.
b) Lactic acid.

Question 8.
Complete the flow chart related to metabolism.
Kerala Syllabus Class 9 Biology Model Question Paper Set 3 English Medium 2
Answer:
Kerala Syllabus Class 9 Biology Model Question Paper Set 3 English Medium 3

Question 9.
“A substantial amount of oxygen in the atmosphere is released by producers in the ocean. Pollution is the most serious threat the marine ecosystem faces.”
Write any two steps to be taken to prevent ocean pollution.
Answer:
Reduce plastic production & waste, Improve wastewater systems, Use eco-friendly products, Reduce chemical pollution (Any two)

Kerala Syllabus Class 9 Biology Model Question Paper Set 3 English Medium

Question 10.
Observe the figure and answer the following questions.
Kerala Syllabus Class 9 Biology Model Question Paper Set 3 English Medium 4
a) What is lymph?
b) What is the role of the lymphatic system in digestion?
Answer:
a) Lymph is a fluid derived from tissue fluid that enters specialized vessels called lymph capillaries.
It differs from blood in that it lacks red blood cells and large protein molecules.

b) The lymphatic system plays a vital role in transporting certain products of fat digestion and fat soluble vitamins absorbed from the small intestine. These are transported through lymph vessels instead of directly entering the bloodstream.

III. Answer any 4 from questions 11 to 15. Each carries 3 scores (4 × 3 = 12)

Question 11.
Arrange the given steps of blood circulation in the correct order, starting from Right atrium.
• Blood from different parts of the body reaches the right atrium.
• Blood passes through the pulmonary artery to the lungs.
• Right ventricle contracts.
• Blood reaches the left atrium through the pulmonary veins.
• Right ventricle receives blood through the tricuspid valve.
• Left ventricle receives blood through the bicuspid valve.
Answer:
• Blood from different parts of the body reaches the right atrium.
• Right ventricle receives blood through the tricuspid valve.
• Right ventricle contracts.
• Blood pass through the pulmonary artery to lungs.
• Blood reaches the left atrium through the pulmonary veins.
• Left ventricle receives blood through the bicuspid valve

Question 12.
Complete the flowchart using the hints.
Hints:
• Portal vein
• Lacteal of villus
• Amino acids
• Glycerol
• Hepatic vein
• Lymph vessel
Kerala Syllabus Class 9 Biology Model Question Paper Set 3 English Medium 5
Answer:
Kerala Syllabus Class 9 Biology Model Question Paper Set 3 English Medium 6

Question 13.
Give reasons for the following.
a) Plasma membrane is known as a selectively permeable membrane.
b) When raisins are placed in freshwater, they will bulge.
c) Plants store glucose in the form of starch in leaves.
Answer:
a) The plasma membrane is called a selectively permeable membrane, because, it allows only
certain molecules to pass through it.

b) When raisins are placed in fresh water, they will bulge, because a high amount of water enters into it. This is because of the movement of water molecules from higher concentration to lower concentration.

c) Since glucose is readily soluble in water, it can not be stored. Hence it is converted into insoluble starch in plants.

Question 14.
Observe the figure related to breathing and answer the questions.
Kerala Syllabus Class 9 Biology Model Question Paper Set 3 English Medium 7
a) Identify the step of breathing.
b) Name the parts indicated as X and Y.
c) How does the combined action of X and Y help in this process?
Answer:
a) Inspiration
b) X – Intercostal muscles, Y – Diaphragm
c) During inspiration, air enters the lungs by the contraction of both the intercostal muscles and the diaphragm.

Question 15.
Complete the following table related to cellular respiration suitably.

Indicator Glycolysis Kreb’s cycle
Location (i) …………………….. (ii) ……………………..
Need of oxygen (iii) …………………….. (iv) ……………………..
Process (v) ……………………..is converted into Pyruvic acid Pyruvic acid is converted to (vi) ……………………..

Answer:
(i) Cytoplasm
(ii) Mitochondria
(iii) No need of Oxygen
(iv) Oxygen required
(v) Glucose
(vi) Carbon dioxide, water and 28 ATP.

Kerala Syllabus Class 9 Biology Model Question Paper Set 3 English Medium

IV. Answer any 4 from questions 16 to 20. Each carries 4 scores (4 × 4 = 16)

Question 16.
Classify the given items under two suitable headings in the given table below.
Calcitonin, Sucrase, Progesterone, Salivary amylase, Testosterone, Lipase, Pepsin, Thymosine, Thyroxine

…………………….. ………………………….

Answer:

Enzymes Hormones
1. Salivary amylase in saliva 1. Sex hormone – Testosterone, Estrogen, Progesteron
2. Pepsin in the gastric juice 2. Thyroxine
3. Sucrase 3. Calcitonin
4. Lipase 4. Thymosin

Question 17.
“Nature and humans are receiving countless services from plants. Most plant parts have economic importance in one way or the other.”
a) Mention the economic importance of plants.
b) List any three services provided by plants to the biosphere.
Answer:
a) Besides food and medicines, plants and trees play an essential role in industries. Many raw
materials are obtained from plants and giant trees, and used to produce various industrial products, including paper, spices, cosmetics, pencils, rubber, furniture, and other household products.

b)

  • Provide food
  • Provide oxygen
  • Decrease the level of global warming by the absorption of CO2.
  • Mitigate natural calamities
  • Act as the storehouse of biodiversity
  • Provide economically important resources (Any three).

Question 18.
Transport in plants takes place through two types of complex tissues in plants, namely Xylem and Phloem.
a) What are the main forces that drive water movement through the xylem?
b) How does water loss from leaves through transpiration contribute to water movement?
Answer:
a) The main forces responsible for water movement through thexylem are cohesion and adhesion:
Cohesion: The attraction between water molecules due to hydrogen bonding. This allows water molecules to form a continuous chain that pulls water upwards.
Adhesion: The attraction of water molecules to the walls of the xylem tubes. This helps create a continuous water column that resists breaking.

b) Transpiration is the loss of water vapor from leaves through tiny pores called stomata. As water evaporates from leaves, it creates a suction force that pulls water upwards through the xylem from the roots. This “pull” is aided by the cohesive and adhesive properties of water.

Question 19.
Observe the figure and answer the questions.
Kerala Syllabus Class 9 Biology Model Question Paper Set 3 English Medium 8
i) Which is the method of treatment indicated in the figure?
ii) When is this treatment needed?
iii) Write the stages of this treatment in correct order.
Answer:
i) Haemodialysis

ii) Haemodialysis is the process proposed by modern medicine for the removal of wastes from the blood when both kidneys become non-functional

iii) a) Blood which contains wastes from the artery is pumped into the dialysis unit. Heparin is
added to prevent coagulation.
b) Wastes from the blood are diffused into the dialysing fluid when it flows through the cellophane tube.
c) Purified blood is pumped back to the veins through another tube.

Kerala Syllabus Class 9 Biology Model Question Paper Set 3 English Medium

Question 20.
Redraw the diagram, label the parts, and write their functions.
Kerala Syllabus Class 9 Biology Model Question Paper Set 3 English Medium 9
Answer:
Kerala Syllabus Class 9 Biology Model Question Paper Set 3 English Medium 9
a) Kidney: They remove waste products from the blood and produce urine. Kidneys control the levels of many substances in the blood. Kidneys help to control our blood pressure.

b) Ureters: The ureters are the part of the urinary system, The ureter’s role in the process is to carry urine from the kidneys to the bladder. Contractions in the ureter, force urine away from the kidneys and into the bladder.

c) Urinary bladder: A hollow organ that stores urine from the kidneys before disposal by urination.
Urethra: The urethra acts as a passage to expel urine from the urinary bladder to the outside of the body.

Kerala Syllabus Class 9 Biology Model Question Paper Set 2 English Medium

Teachers recommend solving Kerala Syllabus 9th Standard Biology Question Paper Set 2 to improve time management during exams.

Kerala Syllabus Std 9 Biology Model Question Paper Set 2 English Medium

Time: 1½ Hours
Max Score: 40 Marks

Instructions:
• First 15 minutes is given as cool off time. This time is to be spend for reading and understanding the questions.
• Answer the questions according to the directions.
• Score and time to be considered while answering.

I. Answer any 4 from questions 1 to 5. Each carries 1 score (4 × 1 = 4)

Question 1.
What are the main components of the plasma membrane?
Answer:
The plasma membrane is primarily made up of phospholipid layers and proteins.

Question 2.
Name the biomolecules formed in cells to aid and regulate metabolism.
Answer:
Enzymes and hormones

Question 3.
Which are the major excretory substances in our body?
Answer:
The main excretory product generated by the human body is urea. The urea is excreted out of the body via urine. Sweat is another excretory substance from skin.

Kerala Syllabus Class 9 Biology Model Question Paper Set 2 English Medium

Question 4.
Name the membrane that covers the lungs.
Answer:
Pleura

Question 5.
Write any two services that plants provide to the living world.
Answer:

  • Providefood.
  • Provide oxygen.

II. Answer any 4 from questions 6 to 10. Each carries 2 score (4 × 2 = 8)

Question 6.
Give reason for the following:
a. Light phase takes place in grana.
b. Xanthophyll and Carotene are called accessory pigments.
Answer:
a. Pigments that absorb sunlight are found in the grana of chloroplast.
b. Pigments other than chlorophyll a, absorb light and transfer it to chlorophyll a. so, they are termed as accessory pigments.

Question 7.
Why doesn’t food enter trachea while swallowing it?
Answer:
Tongue compresses the food into balls with the help of palate. Uvula closes the nasal cavity that opens to the pharynx. Posterior part of the tongue allows food to move over the epiglottis into the oesophagus. Trachea rises up and is closed by the epiglottis. Thus, the food does not enter to trachea.

Question 8.
How does ammonia is converted into urea in liver?
Answer:
Synthesis of urea takes place in the liver. Amino acids are formed by the breakdown of proteins. As a result of the metabolic activities of amino acids, several nitrogenous by-products are formed. The most harmful among these is ammonia. The ammonia formed in tissues diffuses into blood through tissue fluids and blood transports it to the liver. In the liver with the help of certain enzymes, ammonia combines with carbon dioxide and water to form urea.

Question 9.
Mention the main excretory organs and the excretory products respectively of the following organisms.
a) Insects
b) Reptiles
c) Earthworms
d) Birds
Answer:
a) Insects – Malplghian tubules – Uric acid
b) Reptiles – Kidney – Uric acid
c) Earthworms – Nephridia – Urea
d) Birds – Kidney – Uric acid

Question 10.
What is the role of chemical digestion?
Answer:
Chemical digestion breaks down complex nutrients (like proteins, carbohydrates, and fats) into simpler absorbable forms (like amino acids, sugars, and fatty acids). This is achieved by enzymes present in digestive juices secreted by various organs along the digestive tract.

Kerala Syllabus Class 9 Biology Model Question Paper Set 2 English Medium

III. Answer any 4 from questions 11 to 15. Each carries 3 scores (4 × 3 = 12)

Question 11.
Kidney stone, nephritis, uremia etc. are some diseases affecting the kidneys. Prepare a table including the causes and symptoms of these diseases.
Answer:

Diseases Causes Symptoms
Kidney stone Not drinking enough water Severe pain in your back or side, Blood in urine, A burning feeling when urinating.
Nephritis Diabetes, genetic disorder link that affects the kidneys. Decreased urine output, High blood pressure, urine appears dark, tea- coloured, or cloudy
Uraemia Diabetes, High blood pressure Nausea, Vomiting, Loss of appetite

Question 12.
a) Define metabolism
b) What role do enzymes play in metabolism?
c) Why is homeostasis important for metabolism?
Answer:
a) Inside the cell, biomolecules and many other chemicals work together to show all signs of life. All such chemical reactions together taking place in an organism are called metabolism.

b) Enzymes act as biological catalysts, speeding up the countless chemical reactions that occur constantly within an organism.

c) Maintaining homeostasis, a stable internal environment, is crucial for the smooth functioning of metabolism.

Question 13.
Nutrients are essential for metabolism.
a) How do animals get nutrients?
b) How do plants get nutrients?
c) Which is known as the energy currency of the cell?
Answer:
a) Animals get their nutrients from their surroundings, and they depend on other organisms for their food. They are heterotrophic organisms.

b) Plants follow an autotrophic mode of nutrition. They can prepare their own food by photosynthesis.

c) ATP

Question 14.
Cellular respiration is the process of releasing energy from glucose inside the cells.
a) What are the two stages of cellular respiration?
b) Name the cell organelle in which the second phase of cellular respiration takes place.
c) What are the end products of cellular respiration?
Answer:
a) Glycolysis and Kreb’s cycle.
b) Mitochondrion.
c) CO2 and water

Question 15.
Find out the functions of different proteins in plasma.
Answer:
Albumin – Regulates blood pressure
Globulin – Helps in defence
Fibrinogen – Plays a major role in the coagulation of blood.

Kerala Syllabus Class 9 Biology Model Question Paper Set 2 English Medium

IV. Answer any 4 from questions 16 to 20. Each carries 4 scores (4 × 4 = 16)

Question 16.
Briefly explain the parts of the Human respiratory system and prepare a flowchart to illustrate the path of atmospheric air, entering the nostrils till it reaches the alveoli.
Answer:
Kerala Syllabus Class 9 Biology Model Question Paper Set 2 English Medium 1
The human respiratory system consists of a group of organs and tissues that help us to breathe. The major parts include:
A pair of external nostrils: To inhale and exhale air.

Nasal chamber: This is lined with hair and mucus to filter the air from dust and dirt.

Pharynx: It is a passage behind the nasal chamber and serves as the common passage for both air and food.

Larynx: It is the sound box

Trachea: A long tube passing through the mid-thoracic cavity also known as a windpipe. The walls of the trachea comprise C-shaped cartilaginous rings which give hardness to the trachea and maintain it by completely expanding. The trachea extends further down into the breastbone and splits into two bronchi, one for each lung

Bronchi: The trachea divides into left and right bronchi.

Bronchioles: Each bronchus is further divided into finer channels known as bronchioles.

Alveoli: The bronchioles terminate in balloon-like or sac-like structures known as the alveoli,Through which gaseous exchange takes place.

Lungs: Humans have a pair of lungs, which are sac-like structures and covered by a double-layered membrane known as pleura.

Question 17.
Though photosynthesis is ultimately anabolism, it also involves catabolism’. Analyze the statement.
Answer:
Photosynthesis is an anabolic process during which plants use energy from sunlight to convert carbon dioxide gas and water into sugar molecules. But during this anabolic process, some breaking down reactions have also happened. An example of a catabolic reaction during photosynthesis is the process of food digestion, where different enzymes break down food particles, so that they can be absorbed easily by the small intestine.

Question 18.
Chloroplasts are the cell organelles that are responsible for the photosynthetic process, in plants.
a) Which are the 3 types of plastids present in plant cells?
b) What is the role of carotenoid pigments?
c) Which is known as the colourless plastids?
d) Define thylakoids.
Answer:
a) Chloroplast, Chromoplast, and leucoplast

b) Carotenoid pigments are responsible for different colours like yellow, orange, and red colour imparted to fruits, flowers, old leaves, roots, etc.

c) Leucoplasts

d) Thylakoids are the numerous membranous sacs arranged like stacks of coins within the stroma of chloroplast.

Question 19.
Analyse the figure and answer the questions.
Kerala Syllabus Class 9 Biology Model Question Paper Set 2 English Medium 2
a) Write the names of the circulations X and Y.
b) Write the names of the blood vessels i, ii, iii, iv, v.
c) What is the role of these circulations in the exchange and transport of gases?
d) Explain the role of these circulations in the process of excretion.
Answer:
a) X-Alveolar exchange of gases (Pulmonary circulation), Y – Systemic exchange of gases (Systemic circulation).

b) (i) Inferior vena cava,
(ii) Superior vena cava,
(iii) Pulmonary artery,
(iv) Pulmonary vein,
(v) Aorta

c) Pulmonary circulation moves blood between the heart and the lungs. It transports deoxygenated blood to the lungs to absorb oxygen and release carbon dioxide. The oxygenated blood then flows back to the heart. Systemic circulation moves blood between the heart and the rest of the body.

d) The pulmonary veins by pulmonary circulation return oxygenated blood to the heart, which releases CO from the deoxygenated blood to the lungs for gaseous exchange. The release of CO2 is a kind of excretion. In systemic circulation, blood with oxygen, nutrients, and hormones travels from the heart to the rest of the body. In the veins, the blood picks up waste products as the body uses up oxygen, nutrients, and hormones.

Kerala Syllabus Class 9 Biology Model Question Paper Set 2 English Medium

Question 20.
Complete the given flow chart using the hints.
Kerala Syllabus Class 9 Biology Model Question Paper Set 2 English Medium 3
Answer:
Kerala Syllabus Class 9 Biology Model Question Paper Set 1 English Medium 4