Teachers recommend solving Kerala Syllabus 9th Standard Biology Question Paper Set 1 to improve time management during exams.
Kerala Syllabus Std 9 Biology 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 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.
Identify the process which is not a stage of nutrition.
Mechanical digestion, Absorption, Peristalsis, Ingestion.
Answer:
Peristalsis
Question 2.
Name the scientist who explained the reactions in the dark phase of photosynthesis.
Answer:
Melvin Calvin.
Question 3.
Name the organ where urea is synthesised?
Answer:
Liver
Question 4.
Name the phase of cellular respiration that takes place in the cytoplasm.
Answer:
Glycolysis.
Question 5.
Who are the chief producers in the ocean ecosystem?
Answer:
Algae and Phytoplanktons
II. Answer any 4 from questions 6 to10. Each carries 2 score (4 × 2 = 8)
Question 6.
One of the phases of photosynthesis is known as the Calvin cycle.
a. Identify the phase.
b. Why it is known as the Calvin cycle?
Answer:
a) Dark phase.
b) The reactions in the dark phase were discovered by the scientist Melvin Calvin.
Question 7.
Write two suitable, examples indicating the role of plants in the mitigation of natural disasters.
Answer:
- Mangrove forests help in controlling Tsunami to some extent.
- Bamboo forests, reed, vetiver, lemongrass, etc. protect the river banks from collapsing during flood.
- Trees and bushes prevent soil erosion and landslides.
Question 8.
Observe the given diagram related to the absorption of substances into lacteals and answer the questions.
a) Identify the process.
b) Which nutrients are absorbed through this process?
Answer:
a) Simple diffusion
b) Fatty acid and glycerol
Question 9.
Respiratory surfaces are different in various organisms. Mention the respiratory surfaces of the given organisms.
a) Fish
b) Earthworm
Answer:
a) Fish – Gills
b) Earthworm – Skin (Cutaneous respiration)
Question 10.
Given indicators are related to a specific part of the wall of heart. Analyse them and answer the questions.
• Functions like an electric cell.
• Located on the right atrial wall.
a) Which part of the heart is mentioned in the hints?
b) What is its function?
Answer:
a) Pacemaker (Sino atrial node)
b) Initiates the contribution and relaxation of heart and regulates the rate of heartbeat.
III. Answer any 4 from questions 11 to 15. Each carries 3 scores (4 × 3 = 12)
Question 11.
Synthesis of urea takes place in the liver
a) How does Urea synthesis happens?
b) Explain the elimination of urea.
c) What is excretion?
Answer:
a) The ammonia formed in tissues diffuses into blood through tissue fluids and blood transports it to the liver. In liver, with the help of certain enzymes, ammonia combines with carbon dioxide and water to form urea.
b) Kidneys play a major role in the excretion of urine which contains waste materials including urea. Urea is made when foods containing protein (such as meat, poultry, and certain vegetables) are broken down in the body. Urea is carried in the blood to the kidneys. This is where it is removed, along with water and other wastes in the form of urine.
c) Excretion is the process of removal of waste materials from the body.
Question 12.
Why all components in the glomerular filtrate are not present in urine? Find out the components that are reabsorbed and the components that are secreted.
Answer:
Because some of the components in the glomerular filtrate are reabsorbed into the blood and some are secreted into the renal tubules, so that, all compoments in the glomerular filtrate are not present in urine.
Components that are reabsorbed: Glucose, amino acids, NaCI, and other essential salts Components which are secreted: Hydrogen ions, potassium ions, etc.
Question 13.
Observe the picture and answer the following questions.
a) Identify and write‘X’and‘Y’.
b) Write the functions of the delicate and elastic air sacs seen at the end of ‘Y’.
c) How does the volume inside ‘Z’ reduce during expiration? How it is helpful?
Answer:
a) X = Trachea
Y= Bronchiole.
b) The exchange of respiratory gases takes place in these alveoli.
c) The intercostal muscles and diaphragm relaxes to lower the ribs during expiration. Thus the volume of the thoracic cavity decreases.
Question 14.
Complete the illustration related to human circulatory system.
Answer:
i) Double circulation
ii) Systemic circulation
iii) Start from the right ventricle and ends in the left atrium.
Question 15.
How far is the structure of villus suitable for the absorption process?
Answer:
Villi increase the surface area of absorption of nutrients to a great extent within the small intestine. Absorption of simple nutrients and 90 percent of water takes place through villi. Villi are lined with single-layered epithelial cells, which are the primary surface for nutrient absorption. Blood capillaries within the villus, formed from an arterial branch, absorb glucose, fructose, galactose, and amino acids, and then unite to form veins that exit the villus. Additionally, the lacteal, a branch of the lymph vessel, absorbs fatty acids and glycerol into the lymph.
IV. Answer any 4 from questions 16 to 20. Each carries 4 scores (4 × 4 = 16)
Question 16.
How does the body utilise each nutrient? Find out.
Answer:
Carbohydrates in our body are broken down into simple sugars in the digestive system. Glucose enters the bloodstream and is transported to cells, where it’s used for immediate energy production or stored for later use as glycogen in the liver and muscles.
Proteins are broken down into amino acids during digestion. Amino acids are then absorbed into the bloodstream and used to build, repair, and maintain various body structures and functions. Fats are broken down into fatty acids and glycerol during digestion. Fatty acids are then transported to cells for energy storage or used to build cell membranes and signaling molecules.
Vitamins are absorbed in small amounts from food and transported throughout the body. They work in conjunction with enzymes to regulate numerous metabolic processes.
Question 17.
An illustration related to the circulatory system of human beings is given below. Analyse it and answer the questions.
a) Which letter indicates Pulmonary artery?
b) Which blood vessel is indicated by the letter D?
c) Does the blood that has entered the ventricles return to the atria? Why?
d) What is the importance of double circulation in human?
Answer:
a) A
b) Aorta
c) No, the blood do not flow back to the atria. Because, tricuspid valve and bicuspid valve prevents the backflow of blood from ventricles to atria.
d) The same amount of blood passes through the human heart twice. This type of circulation is called double circulation. It includes pulmonary circulation and systemic circulation. Double circulation helps us to maintain the level of oxygen, in our body.
Question 18.
Redraw the figure given below, name and label the parts based on the indicators.
a) Part where odontoblast cells are seen
b) Tissue that holds the tooth in the gum.
c) The living tissue by which tooth is made.
Answer:
a) Pulp cavity
b) Cementum
c) Dentine
Question 19.
Plants store glucose in the form of starch.
a) Why do plants store glucose in the form of starch in leaves?
b) If glucose is what all plants prepare, then how could we get starch, protein, and fat from vegetable food items?
c) Why plants are called autotrophs?
Answer:
a) Since glucose is easily soluble in water it cannot be stored in the plant body as such. Therefore, plants store glucose in the form of insoluble starch in leaves.
b) Glucose produced after photosynthesis undergoes many metabolic activities and converts glucose into many nutrient-rich sources like tubers containing starch, legumes containing proteins, oil seeds containing fats, fruits containing fructose, and sugarcane containing sucrose.
c) Plants can produce their own food by photosynthesis and are called autotrophs.
Question 20.
Name the parts related to the human excretory system using the following hints.
a) Ultra filters present in the kidneys
b) Network of minute capillaries present in the Bowman’s capsule
c) Blood vessel which carries blood away from the kidneys
d) Part that carries urine to the urinary bladder.
Answer:
a) Nephrons
b) Glomerulus
c) Renal vein
d) Ureters