Bhagya

Teachers recommend solving Kerala Syllabus Plus One Zoology Previous Year Question Papers and Answers Pdf September
2021 to improve time management during exams.

Kerala Plus One Zoology Previous Year Question Paper September
2021

I. Answer any 3 questions from 1 to 6. Each carries 1 score. (3 × 1 = 3)

Question 1.
Complete the following table.

Heat Sound	Caused due to
Lub
Dub

Answer:

Heat Sound	Caused due to
Lub	Closure of tricuspid and bicuspid valves
Dub	Closure of Semilunar valves

Question 2.
Observe the picture and answer the questions.
(a) Identify the picture.
(b) How does this structure help the organism?

Answer:
(a) Cnidoblast
(b) Functions: act as defence organ

Question 3.
Name the following:
(a) Structure which connects two cerebral hemispheres.
(b) Four rounded swellings in midbrain.
Answer:
(a) Corpus callosum
(b) Corpora quadrigemina

Question 4.
Respiratory disorder in which alveolar walls are damaged, due to which respiratory surface is decreased.
Answer:
Emphysema

Question 5.
Prepare two correctly matched pairs from the given terms.
(Ommatidia, Cardiac tissue, Intercalated disc, Malpighian-tubules, Sense organ, Goblet cell)
Answer:
Ommatidia : Sense Organs Cardiac tissue : Intercalated disc

Question 6.
Observe the graph and comment.

Answer:
It’s a graph showing the relationship between . temperature and Enzymatic action. In this low temperature preserves the enzymes in inactive state whereas high temperature destroy enzyme activity because proteins are denatured by heat.

II. Answer any 9 questions from 7 to 24. Each carries 2 scores. (9 × 2 = 18)

Question 7.
Which hormonal deficiency is responsible for the following conditions?
(a) Diabetes insipidus
(b) Grave’s disease
(c) Cretinism
(d) Diabetes mellitus
Answer:
(a) Antidiuretic hormone or ADH
(b) Grave’s disease due to hyperthyroidism.
(c) Thyroid Hormones
(d) Insulin

Question 8.
Give two examples for each of the following:
(a) Synovial joints
(b) Muscle proteins
Answer:
(a) Ball and socket joint
(b) Actin and Myosin

Question 9.
Human dentition is said to be diphyodont and heterodont. What do you mean by these terms?
Answer:

1. Diphyodont: Human beings forms two sets of teeth during their life, a set of deciduous teeth is replaced by a set of permanent teeth
2. Heterodont: Humans have four different types of teeth like incisor, canines, premolar and molar

Question 10.
Male cockroach can be easily differentiated from female, in their morphological features.
(a) Name this phenomenon.
(b) Give one external difference between male and female cockroach.
Answer:
(a) Sexual dimorphism

Male Cockroach	Female cockroach
Wings extend beyond the tip of the abdomen	Wings extend upto abdomen
Anal style present	Anal style absent

Question 11.
Complete the representation by filing a, b, c and d.

Answer:
(a) Decrease Reabsorption of water
(b) Adrenal cortex
(c) Pituitary gland
(d) Increases Reabsorption of water

Question 12.
Mention a single word/term for the following:
(a) File like rasping organ in molluscans.
(b) Property of a living organism to emit light.
(c) Alternation of generation in Cnidarians.
(d) Hollow bones with air cavities.
Answer:
(a) Radula
(b) Bioluminescence
(c) Metagenesis
(d) Pneumatic bone

Question 13.
Match the hexagons with stars correctly.

Answer:

1. Index to plant species found in an area – Flora
2. Specialised garden with collection of living plants – Botanical Garden
3. Collection of preserved plants and animals – Museum
4. Information of any one taxon – Monograph

Question 14.
Label the parts marked (A) and (B). Write their functions.

Answer:
A – Hepatic caeca
Function: It’s a digestive gland secrete digestive juice

B – Malpighian Tubule
Function: Excretory organ of cockroach

Question 15.
Pick out the parts of a nephron from the given pool and arrange them in sequential order from Bowman’s capsule.
Collecting duct, Distal Convoluted Tubule, Henle’s loop, Proximal Convoluted Tubule
Answer:
Bowman’s capsule – Proximal convoluted tubule- Henle’s loop-Distal Convoluted Tubule-Collecting duct

Question 16.
Label the parts (a), (b), (c) and (d) in the given picture

Answer:
(a) Mucosa
(b) Sub mucosa
(c) Lumen
(d) Serosa

Question 17.
The name of different bones, seen in forelimb and hindlimb are given below. Arrange them in two columns.
(Humerus, Tibia, Carpals, Fibula)
Answer:

Bones in Forelimb	Bones in Hind limb
Humerus	Tibia
carpals	Fibula

Question 18.
A boy was trapped in a lift and his heart rate as well as breathing rate increased.
(a) Name the hormone responsible for this.
(b) What is the collective name for these hormones?
(c) Which gland produce these hormones?
(d) Where is this gland located?
Answer:
(a) Adrenaline and noradrenaline
(b) Fight or flight hormone or emergency hormones
(c) Adrenal gland
(d) Anterior part of each kidney

Question 19.
(a) Name the tissue marked A and B
(b) Among these, which one is referred to as pacemaker and why?

Answer:
(a) A- Sino-atrial node or SAN
B-Atrio-ventricular node or AVN

(b) SAN is called pace maker because SAN can generate 70-75 min-1 action potential and is responsible for initiating and maintaining the rhythmic contractile activity of heart.

Question 20.
A student of Class XI, collected some specimens during the field trip conducted by the Science club. Help him to classify these animals to their respective phylum/class.
(Spongilla, Ctenoplasa, Laccifer, Calotes)
Answer:

• Spongilla – Phylum Porifera
• Ctenoplana – Phylum Ctenophora
• Laccifer – Phylum Arthropoda
• Calotes – Class Reptilia

Question 21.
Write the structure of
(a) Alanine
(b) Glycine
Answer:

Question 22.
Draw a flow chart, showing the physiological processes involved in the formation of cross bridges during muscle contraction.
Answer:

Question 23.
Figure (A) and (B) shows the fishes of two different classes. Identify the differentiate between them.

Answer:
A – Shark
B – Catla

Class Chondrichthyes	Class Osteichthyes
They have cartilaginous endoskeleton	They have bony Endoskeleton
Gill slits are separate and without operculum	They have four pairs of gills which are covered by an operculum on each side
The skin minute placoid scales	Skin is covered with cycloid/ctenoid scales
Air bladder absent	Air bladder is present

Question 24.
Observe the table given below and replace (a), (b),
(c) and (d) from those animals given in brackets. (Hydra, Shark, Spongilla, Starfish)

Asymmetry	Radial Symmetry	Bilateral Symmetry
Sycon	(a)	(b)
(c)	(d)	Cockroach

Answer:

Asymmetry	Radial Symmetry	Bilateral Symmetry
Sycon	Hydra/Star fish	Shark
Spongilla	Star fish/ Hydra	Cockroach

III. Answer any 3 questions from 25 to 30. Each carries 3scores. (3 × 3 = 9)

Question 25.
(a) What is ECG?
(b) Draw a standard EGG and explain the different waves in it.
Answer:
a) ECG is a graphical representation of the electrical activity of the heart during a cardiac cycle

P-wave represents the electrical excitation or depolarisation of the atria. which leads to the contraction of both the atria QRS complex represents the depolarisation of the ventricles which initiates the ventricular contraction. The T-wave represents the return of the ventricles from excited to normal state (repolarisation)

Question 26.
Non-protein constituents called co-factors are bound to the enzyme, to make it catalytically acve.
(a) Name the protein part of the enzyme.
(b) Mention any two kinds of co-factors with examples.
(c) What happens to the catalytic activity of enzyme, when the co-factor is removed?
Answer:
a) Apoenyme
(b) i) Prosthetic group – They are cofactors tightly bound to the apoenzyme.
Example: In peroxidase and catalase-haem is the prosthetic group

ii) Co-enzymes-They are loosely bound to the apoenzyme
Examples: Coenzyme nicotinamide adenine dinucleotide (NAD) and NADP

(c) Catalytic activity is lost when the co-factor is removed from the enzyme.

Question 27.
Name the distinctive character (responsible for the group names) of the following animal:
(a) Ctenophora
(b) Echinodermatä
(c) Mammalia
(d) Chordata
(e) Annelida
(l) Arthropoda
Answer:
(a) Presence, of ciliated comb plate
(b) These animals have an endoskeleton of calcareous ossicles
(c) Presence of milk producing mammary gland
(d) Presence of notochord
(e) Their body surface is distinctly marked out into segments
(f) They have jointed appendages

Question 28.

(a) What is depicted by this graph?
(b) Write any 3 factors which can alter this graph.
(c) What is its significance?
Answer:
(a) The graph shows the relation between pO₂ and percentage saturation of haemoglobin with oxygen
(b) Temperature or pH or H⁺
(c) It is highly useful in studying the effect of factors like pCO₂, H⁺ concentration, etc., on binding of O₂ with haemoglobin.

Question 29.
(a) Prepare a pathway of an action, using the following hints: (Hints: Receptor, Interneuron in spinalcord. Motor neutron, Effector organ, Afferent neuron)
(b) Give one example for such action.
Answer:
(a) Receptor-Afferent neuron-lnterneuron in spinal cord-Motor neuron- Effector organ.
(b) Knee jerk reflex.

Question 30.
Cell junctions provide both structural and functional links between its individual cells. Name and comment on the different types of cell functions.
Answer:

1. Tight junctions: Tight junctions help to stop substances from leaking across a tissue.
2. Adhering junctions : It perform cementing to keep neighboring cells together.
3. Gap junctions : It facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells, for rapid transfer of ions and molecules.

Teachers recommend solving Kerala Syllabus Plus One Zoology Previous Year Question Papers and Answers Pdf June 2022 to improve time management during exams.

Kerala Plus One Zoology Previous Year Question Paper June 2022

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

Question 1.
Pick out the proenzyme present in gastric juice from the following:
(Trypsinogen, Procarboxypeptidase, Pepsi-nogen, Amylase)
Answer:
Pepsinogen

Question 2.
After ovulation, the ruptured follicle in ovary is converted to a structure called
Answer:
Corpus luteum

Question 3.
Name the most abundant protein in animal world.
Answer:
Collagen

Question 4.
Identify the graph.

Answer:
Oxygen dissociation curve

II. Answer any 9 questions from 5 to 17. Each carries 2 scores. (9 × 2 = 18)

Question 5.
Mention two functions of the following:
(a) Gills in Mollusca
(b) Flame cells in Platyhelminthes.
Answer:
a) It helps in Respiration
b) It helps in Excretion

Question 6.
How does glands differ from endocrine glands? Name two secretions of exocrine glands.
Answer:

Endocrine glands	Exocrine glands
Endocrine glands do not have ducts	Exocrine glands have ducts
Their products called hormones are secreted directly into blood	Their products are released through ducts or tubes

1. secretions are hormones
2. Secretions are enkymes
   Secretions of exocrine glands : Mucus and Saliva.

Question 7.
Match the following:

(a) Blood cells	Function
(b) Neutrophils	i) Transport of respiratory gases
(c) Basophils	ii) Immune
(d) Eosinophils	iii) Secrete histamine
(e) Lymphocytes	iv) Allergic reactions
	v) Phagocytic destruction of foreign organisms

Answer:

Column A	Column B
Neutrophils	Phagocytic destruction of foreign organism
Basophi	Secrete Histamine
Eosinophil	Allergic reactions
Lymphocytes	Immune response of the body

Question 8.
The given diagram represents a section of small intestinal mucosa.

Answer:
a) A – Villi,
B – Lacteal

b) A-Villus helps in the absorption of food andi increase the surface area B-Lacteal helps in transport of fat globules

Question 9.
Name the different respiratory centres situated in brain. Explain their role in maintaining and moderating the respiratory rhythm.
Answer:
Respiratory rhythm centre: Maintain and moderate the respiratory rhythm to suit the demands of the body tissues.

pneumotaxic centre: It can moderate the functions of the respiratory rhythm centre. Neural signal from this centre can reduce the duration of inspiration and thereby alter the respiratory rate.

Chemosensitive area: It is highly sensitive to CO₂ and hydrogen ions. Increase in these substances can activate this centre, which in turn can signal the rhythm centre to make necessary adjustments in the respiratory process.

Question 10.
Musca domestica is the binomial nomenclature of housefly.
(a) Identify the Generic name and specific epithet.
(b) Mention the phylum and class of Musca domestica.
Answer:
a) Generic name : Musca
Specific epithet: domestica

b) Phylum : Arthropoda
Class : Insecta

Question 11.
(a) Identify the tissue and state its main function.

(b) Write two regions in human body where you can find this tissue.
Answer:
a) Compound epithelium Function: Provide protection against chemical and mechanical stresses,
b) They cover the dry surface of the skin and the moist surface of buccal cavity.

Question 12.
The flowing is the pathway of sound waves in the process of hearing. Fill in the blanks with appropriate terms given in the box.

Basilar membrane	Ear Ossicles
Tympanum	Utricle	Tectorial membrane

Answer:
A – Tympanum
B – Ear Ossicles
C – Basilar membrane
D – Tectorial membrane

Question 13.
If the head of cockroach is cut off, it will still live for as long as one week. Justyfy.
Answer:
In the head region, the brain is represented by supra – oesophageal ganglion which supplies nerves to antennae and compound eyes, the head holds a bit of a nervous system while the rest is situated along the ventral part of its body. That is why if the head of a cockroach is cut off, it will still live for as long as one week.

Question 14.
Diagrammatic representation of impulse through and axon is given.

Answer:
When a stimulus is applied at a site on the polarised membrane, the membrane at that site becomes freely permeable to Na⁺.
This leads to a rapid influx of Na⁺ that result outer surface of the membrane becomes negatively charged and the inner side becomes positively charged. The polarity of the membrane at that is thus reversed . ie, Action potential developed.

Question 15.
Complete the following table:

Genus name	Common name
Wuchereria	A
B	Silk-worm
Pheretima	C
D	Honey-bee

Answer:
A – Filariaworm
B – Bombyx
C – Earthworm
D – Apis

Question 16.
Distinguish between diabetes insipidus and diabetes mellitus.
Answer:

Diabetes insipidus	Diabetes mellitus
Due to low secretion of ADH	insulin deficiency result in a disease called diabetes mellitus
Diabetes insipidus results Excess loss of water through urine	Presence of glucose (Glycosuria) and ketone bodies (Ketonuria) in urine

Question 17.
Comment on the symmetry of phylum Porifera and phylum Echinodermata. Name the system of transport of food in the members of these phylums.
Answer:

Symmetry	System of transport of food
• Phylum porifera : asymmetrical	• Phylum porifera : water canal system
• Phylum Echinodermata : In this Larva shows bilateral symmetry and adult shows radial symmetry.	• Phylum Echinodermata: water vascular system

III. Answer any 3 questions from 18 to 22. Each carries 3 scores. (3 × 3 = 9)

Question 18.
Graphical representation of electrical activity of the heart while it is working is given.

Write down the different activities of the heart represented by the peaks from ‘P’ to T.
Answer:

1. PWave: contraction of both the atria
2. QRS Wave: depolarisation of the ventricles or ventricular contraction
3. T Wave: It represent repolarisation of ventricle

Question 19.
Enlist three differences between Red muscle fibre and White muscle fibres.
Answer:

Red musle fibre	White muscle fibre
1. They have high amount of mitochondria and myoglobin.	1. They have lesser amount of mitochondria and myoglobin.
2. These muscle fibres undergo aerobic respiration	2. These muscleifibres undergo anaerobic respiration
3. Thave a lesser amount of Sarcoplasmic Reticulum	3. They have a higher amount of Sarco-plasmic Reticulum

Question 20.
(a) Identify the level of protein structure in the given diagram.

(b) Name two levels of protein structure which are not three dimensional.
(c) Give an example for protein having quaternary structure and justify your answer.
Answer:
a) A tertiary structure of proteins
b) Primary structure and Secondary structure
c) Adult human haemoglobin It consists of two subunits of beta type and two subunits of alpha type together constitute the human haemoglobin (Hb).So it consist of more than one polypeptide

Question 21.
Write any three differences between chordates and non-chordates.
Answer:

Chordates	Non chordates
1. Notocord present.	1. Notochord Absent.
2. Central nervous system is hollow and dorsal.	2. Central nervous system is solid and vental.
3. Post anal tail is present.	3. Post anal tail is absent.

Question 22.
By selecting appropriate terms from the bracket complete the given table which is related with excretory system.
(Urea, Mammals, Uricotelic, Bony fish, Ammonotelic, Uric acid, Snails)

Types of excretion	Nitrogeneous waste	Example
A	Ammonia	E
Ureotelic	C	F
B	D	Birds

Answer:
A – Ammonotelic
B – uricotelic
C – Urea
D – Uric acid
E – Many bony fishes
F – many terrestrial amphibians

Reviewing Kerala Syllabus Plus One Chemistry Previous Year Question Papers and Answers Pdf Model 2023 helps in understanding answer patterns.

Kerala Plus One Chemistry Board Model Paper 2023

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

Question 1.
The prefix for 10¹⁵ is ______
(a) peta
(b) nano
(c) pico
(d) femto
Answer:
(d) femto

Question 2.
What would be the lUPAC name for the element with atomic number 120?
Answer:
Unbinilium

Question 3.
The equilibrium constant for a reaction is ‘x’ for the forward direction. The equilibrium constant for the reverse reaction at the same temperature would be ______
Answer:
\(\frac{1}{x}\)

Question 4.
Write the IUPAC name of the compound given below.

Answer:
Hexane – 2, 5 – dione

Question 5.
The alkane which cannot be prepared by kolbe’s electrolytic method is ______
Answer:
Methane

Answer any 8 questions from 6 to 15. Each carries 2 marks.

Question 6.
(i) ‘Molarity of a solution depends upon temperature’. Justify this statement.
Answer:
Molarity depends on total volume of solution.
Volume depends on temperature

(ii) 4g of NaOH was dissolved in sufficient water to form 250 mL of the solution. Calculate the molarity of this solution. (1)
(Na = 23, O = 16, H = 1)
Answer:
Molarity(M) = \(\frac{\mathrm{W}_{\mathrm{B}} \times 1000}{\mathrm{M}_{\mathrm{B}} \times \mathrm{V}_{\mathrm{mL}}}\)
= \(\frac{4}{40}\) × \(\frac{1000}{250}\) = 0.4 mol/L

Question 7.
(i) What is photoelectric effect? (1)
Answer:
It is the ejection of electrons from the surface of a metal when radiations of suitable frequency strikes on it.

(ii) How is kinetic energy of the ejected electron in photoelectric effect related to the frequency of the electromagnetic radiation? (1)
Answer:
K.E = \(\frac{1}{2}\)mv² =h(v – v₀)
Kinetic energy proportional to frequency of light.

Question 8.
State Heisenberg’s uncertainty principle. Give its mathematical representation.
Answer:
It is impossible to measure both the position and momentum of a moving microscopic particle simultaneously and accurately.
∆x × ∆p >

Question 9.
What are isoelectronic species? Give two ions that are isoelectronic with Mg²⁺.
Answer:
Species which contains same number of electrons.
Al³⁺, Na+, Ne, F~, O₂ , N₃

Question 10.
Give two demerits of Mendeleev’s periodic table,
Answer:
1. Position of hydrogen was not clearly explained.
2. Increasing order of atomic weight was not followed every where eg. K & Ar

Question 11.
State the first law of thermodynamics and give its mathematical form.
Answer:
Energy can neither be created nor be destroyed
∆U = w + q
∆U – change in internal energy
q – quantity of heat absorbed
w – work done

Question 12.
Differentiate homogeneous equilibrium from heterogeneous equilibrium. Give an example for each.
Answer:
If the reactant and product are in same phase at equilibrium it is known as homogenous equilibrium.
eg. N_2(g) + 3H_2(g) → 2 NH_3(g)
If the reactant and product are in different phase at equillibrium it is known as heterogeneous equilibrium.
CaCO_3(s) → CaO_(s) + CO_2(g)

Question 13.
Identify the oxidation sate of chlorine in each of the following.
(a) ClO₃
(b) HCl
Answer:

Question 14.
Explain Carius method for the estimation of halogens in an organic compound.
Answer:
Carius Method: Organic compound is treated with dil. HNO₃ and silver nitrate. White precipitate is formed. It is filtered and weighed.
Percentage of halogen
= \(\frac{\text { Atomic mass of halogenxm × 100 }}{\text { Molecular mass of silverhalide × w }}\)

Question 15.
Draw the cis and trans isomers of the compound given below and label them correctly.
C₆H₅CH = CH-CH₃
Answer:

Answer any 8 questions from 16 to 26. Each : carries 3 scores. (8 × 3 = 24)

Question 16.
(i) How many volumes of water vapour would be produced if 12 volumes of dihydrogen gas reacts with 6 volumes of dioxygen gas? (1)
(ii) An organic compound is made up of 67.9% C, 5.70% H and 26.4% N. Calculate its empirical formula. (2)
Answer:

Question 17.
Calculate the frequency and wavelength of a photon emitted during a transition from n = 5 state to n = 2 state in the hydrogen atom.
Answer:

Question 18.
Define ionisation enthalpy. How does it vary in a period and in a group? Give reasons for your answer.
Answer:
Ionisation energy: It is the amount of energy needed to remove most loosely bound electron from a gaseous neutral atom.
Across the period ionisation enthalpy increases due to the decrease in size and increase in force of attraction.
Down the group Ionisation energy decreases due to the increase in size and decrease in force of attraction.

Question 19.
Explain intermolecular and interamolecular hydrogen bonding with an example.
Answer:
H bond is a bond formed by a H atom which is already attached to an electro negative atom again bonds with another electro-negative atom.
If the H-bond is between the two molecules it is known as intermolecular H-bonding. eg.H₂O, HF, NH₃.
If the H bond is within the same molecule it is known as intramoldecular H-bonding
eg. O-nitro phenol.

Question 20.
Discuss the hybridisation of phosphorous in PCl₅ molecule. Based on this, predict the shape and bond angles in it.
Answer:

axial Cl atom forms 90° bond angle and equatorial Cl atom forms with 120° bond angle.

Question 21.
Calculate the standard enthalpy of formation of benzene. Given

Answer:

Question 22.
(i) Consider the reaction 2A(g) ⇔ 2B(g) + C(g). Write the expression for K_c for this reaction.
(ii) If K_p for this reaction is 3.8 × 10^-6 at 1070 K, calculate K_p at this temperature. (2)
Answer:

Question 23.
Balance following redox reaction taking place in basic medium using oxidation number method.

Answer:

Balance all atoms other than hydrogen and oxygen
2MnO^–₄ + Br^– → 2MnO₂ + BrO^–₃
Balance the no.of oxygen atom
2MnO^–₄ + Br^– → 2MnO₂ + BrO^–₃ + H₂O
Add OH” to the deficient side since it is basic medium
2MnO^–₄ + Br^– + 2H₂O → 2MnO₂ + BrO^–₃ + H₂O
2MnO^–₄ + Br^– + H₂O → 2MnO₂ + BrO^–₃ + 2HO^–

Question 24.
(i) What are nucleophiles and electrophiles? (2)
Answer:
Electophiles: Electron loving species
eg: Cl⁺, BF₃, AlCl₃

(ii) Give an example each for charged and neutral nucleophiles. (1)
Answer:
Nucleophiles : Nucleus loving species,
eg: CN^–, NH₃

Question 25.
(i) State and illustrate Markovnikov rule with an example. (2)
Answer:
Markonikov’s rule:When an unsymmetric reagent is added to an unsymmetric alkene the negative part of the addentum gets attached to the carbon containing lesser number of hydrogen atom.

(ii) What are the products obtained when propene undergoes ozonolysis? (1)
Answer:

Question 26.
Identify the major products A, B and C in the following reactions.

Answer:

Answer nay 4 questions from 27 to 31. Each carries 4 scores. (4 × 4 = 16)

Question 27.
(i) What are quantum numbers? Explain any two quantum numbers. (3)
Answer:
Address of an electron.
1. Principal quantum no. (n): gives idea about energy and size of the orbital.
Values on n =1, 2, 3, 4 …. etc.
2. Azimuthal quantum number (l) – gives us shape of the subshell.
l can have values l = 0 to (n – 1) values. n = 2l = 0, 1 → s & p orbital.
n = 3 l, = 0, 1,2 → s, p and d orbital.
magnetic quantum no. (m) gives orientation of orbitals, m can have value -l to +l
l = 1 m = -1, 0, +1
spin quantum no. (s) gives us idea about spin of electrons. It can have values +½ or -½ .

(ii) Arrange 3d, 4s, and 3p in the increasing order of their energies. (1)
Answer:
3p < 4s < 3d < 4p

Question 28.
(i) Write the MO electronic configuration of N₂. (2)
Answer:
σ 1s² σ * 1s² σ 2s² σ * 2s² π2px² = π2py² σ2pz²

(ii) Calculate its bond order and predict the magnetic behaviour. (2)
Answer:
Bond order = \(\frac{1}{2}\)(N_b – N_a)

Question 29.
(i) What is Gibb’s free energy? (1)
Answer:
The ampount of enery which can be converted to be useful work is knows as Gibb’s free energy

(ii) Give the relation between Gibb’s free energy and enthalpy. (1)
Answer:
G = H – TS

(iii) Predict the spontaneity of a reaction in the following cases.
(a) ∆H and ∆S + v (high T) (1)
(b) ∆H = +ve; ∆S =-ve (1)
Answer:

Question 30.
(i) What are buffer solution? Given an example each for acidic and basic buffers. (2)
Answer:
Solution which resist the change in pH on addition of small amount of acid or alkali.

Acidic buffer – Mixture of weak acid + salt formed by weakacid with strong base, acetic acid + sodium acetate

Basic buffer – Mixture of weak base + salt formed by weak base with strong acid.
NH₄OH + NH₄Cl

(ii) What is the effect of dilution on the pH value of a buffer solution? Give reason. (1)
Answer:
pH of a buffer solution does not change on dilution. On dilution, due to buffer action the ratio of concentration of salt and acid or base remains unchanged.

(iii) Explain common ion effect. (1)
Answer:
The suppression of degree of dissociation of a weak electrolyte by the addition of a strong electrolyte containing a common ion.
Application of Common ion effect:
1. Purification of impure NaCl by using HCl
2. Salting out of soap from glycerol by using NaCl.

Question 31.
(i) Define resonance effect. (1)
Answer:
The polarity induced in a molecule by the interaction of a lone pair of electrons with a pi bond or the interaction of two pi bonds.

(ii) Explain the two types of resonance effect with suitable examples. (2)
Answer:
+ R Effect
Resonance effect which increases the electron density in a conjugated system with activating group.
eg:-OH, -OR, -NH₂, -F, – Cl etc.

-R Effect
Resonance effect which decreases the electron density in a conjugated system with deactivating group.
-NO₂, -CN, -COOH etc.

(iii) Which among the following is a group showing +R effect?
-CN, – OH, -NO₂, -COOH (1)
Answer:
+ R Effect: – OH

Teachers recommend solving Kerala Syllabus Plus One Zoology Previous Year Question Papers and Answers Pdf March 2023 to improve time management during exams.

Kerala Plus One Zoology Previous Year Question Paper March 2023

I. Answer any 3 questions from 1-5. Each carries 1 score. (3 × 1 = 3)

Question 1.
Name the enzyme that accelerate the following re-action:

Answer:
Carbonic anhydrase

Question 2.
The double walled membrane that protects the heart is _____.
Answer:
Pericardium

Question 3.
Scientific name of lion is given below. Which one is correctly written?
(a) Panthera leo
(b) panthera leo
(c) Panthera Leo
(d) panthera Leo
Answer:
Panthera leo

Question 4.
The disorder in which stone or insoluble mass of crystallised salts formed within the kidney.
Answer:
Renal calculi

Question 5.
Name the fluid filled space that separate the membranes of pre and post synaptic neurons at a chemical synapse.
Answer:
Synaptic cleft

II. Answer any 9 questions from 6 -16. Each carries 2 scores.

Question 6.
(a) Name the tissue that acts as pacemaker in human heart.
(b) What is the significance of pacemaker in the . functioning of heart?
Answer:
(a) Sino-atrial node / SAN

(b) SAN can generate the action potentials, and is responsible for initiating and maintaining the rhythmic contractile activity of the heart.

Question 7.
Certain hormones that regulate Kidney function are
given in Column-A. Their specific functions are given in the Column-B. Match them suitably

A	B
ADH	Water reabsorption
Angiotensin II	Powerfull Vaso Constrictor
ANF	Cause dilation of blood vessels
Aldosterone	Reabsorption of Na+

Answer:

A	B
ADH	Powerfull Vaso Constrictor
Angiotensin II	Water reabsorption
ANF	Reabsorption of Na+
Aldosterone	Cause dilation of blood vessels

Question 8.
The processes involved in muscle contraction are given below. Arrange them in correct sequential order. (The first step is given correct).
• A signal sent out by CNS.
• Binding of Ca⁺⁺ with troponin.
• Release of a neurotransmitter.
• Remove the masking of active sites for myosin.
• Release of Ca⁺⁺ into Sarcoplasm.
Answer:

• A signal sent out by CNS.
• Release of a neurotransmitter.
• Release of Ca⁺⁺ into sarcoplasm.
• Binding of Ca⁺⁺ with troponin.
• Remove the masking of active sites for myosin.

Question 9.
Select Poiokilothermous animals from the list:
Corvus, Felis, Rana, Calotes, Scoliodon, Macaca, Hippocampus, Pavo.
Answer:
Poikilothermous Animals – Rana, Calotes, Scoliodon, Hippocampus

Question 10.
General structure of am.ino acid is given:
Draw the structure of the amino acids.
(a) glycine and
(b) Serine.

Answer:

Question 11.
(a) Write any two types of synovial joints.
(b) Identify its location.
Answer:
(a) Ball and Socket, Hinge joint, Pivot Joint, Gliding Joint, Saddle Joint
(b) Ball and Socket- Between humerus and pectoral girdle / Hip join
Hinge joint – Knee Joint
Pivot Joint – Between atlas and axis
Gliding Joint – Between carpals
Saddle Joint – Between carpal and metacarpal of thumb

Question 12.
Observe the illustration :
(a) Identify A & B and fill the blanks.
(b) What happens when the co-factor is removed from the enzyme ?

Answer:
(a) A-Apoenzyme.
B – Prosthetic group.

(b) Catalytic activity of enzyme is lost.

Question 13.
Observe the diagrammatic presentation of ECG.

(a) What is the expansion of ECG?
(b) What do P and QRS complex indicate?
Answer:
(a) Electrocardiogram

(b) P-wave represents the electrical excitation or depolarisationof the atria. QRS complex represents the electrical excitation or depolarisation of the ventricles.

Question 14.
Identify each phylum from the characteristics given :
(a) Comb plates are the locomotory organs.
(b) Show alternation of generation.
(c) Presence of Water Vascular System.
(d) Body consists of proboscis, collar and trunk.
Answer:
(a) Ctenophora
(b) Coelenterata/Cnidaria.
(c) Echinodermata.
(d) Hemichordata.

Question 15.
Observe the graph :

(a) What does the graph represent?
(b) Write any three conditions in the alveoli that favour the formation of oxy-haemoglobin.
Answer:
(a) Oxygen Dissociation Curve
(b) High pO₂, Low pCO₂, Lesser H+ ion concentration, Lower temperature

Question 16.
Write any two differences between Osteichthyes and Chondrichthyes.
Answer:

Chondrichthyes	Osteichthyes
• All are marine fishes	• It includes both marine and fresh water fishes
• They have cartilaginous endoskeleton	• They have bony endoskeleton
• Mouth is ventral	• Mouth is terminal
• Gill slits separate without operculum	• Four pair of gills convered by operculum
• Skin contains placoid scales	• Skin is covered with
• Air bladder absent	• Air bladder absent

III. Answer any 3 questions from 17 to 20. Each carries 3 scoers. (3 × 3 = 9)

Question 17.
Distinguish between :
(a) Nucleosides and Nucleotides
(b) Primary metabolites and Secondary metabolites
(c) Ligases and Lyases
Answer:
(a) Nucleosides-Pentose sugar + Nitrogenous base.
Nucleotides – Pentose sugar + Nitrogenous base + Phosphate group.

(b) Primary metabolites – The biomolecule directly involved in physiological activity.

Secondary metabolites – The biomolecule not directly involved in growth and development.

(c) Ligases – Catalyses the linking of two compounds.
Lyases – Catalyse the removal of group from substrate

Question 18.
Explain any two groups of organisms based on Coelom. Give one example for each group.
Answer:

1. Acoelomates-Animals without coelom.
   e.g:- Platyhelminthes.
2. Coelomates – Animals possessing true coelom. Eg :-Mollusca

Question 19.
Complete the illustration appropriately.

Name 3 layers of Cranial meninges that protects brain.
Outer layer (d) ________
Middle layer (e) _______
Inner layer (f) ________
Answer:
(a) Mid brain
(b) Cerebrum
(c) Cerebellum
(d) Dura mater
(e) Arachnoid
(f) Pia mater

Question 20.
(a) Name two types of cells in Islets of Langerhans.
(b) Write any one function of each type of cell.
(c) Name the gland where Islets of Langerhans found.
Answer:
(a) Alpha cells and Beta cells.

(b) Alpha cells – Produce Glucagon or Hyperglycemic hormone
Beta cells – Produce Insulin or Hypo-glycemic hormone

(c) Pancreas

Teachers recommend solving Kerala Syllabus Plus One Botany Previous Year Question Papers and Answers Pdf Board Model Paper 2020 to improve time management during exams.

Kerala Plus One Botany Board Model Paper 2020 with Answers

I. Answer any 3 questions from 1 – 5. Each carries 1 score. (3 × 1 = 3)

Question 1.
Which among the following produce biogas from the dung of ruminant animals?
a) Thermiacidophiles
b) Cyanobacteria
c) Methanogens
d) Halophiles
Answer:
c) Methanogens

Question 2.
The stage between Meiosis I and Meiosis II is called
a) Diakinesis
b) Interkinesis
c) Pachytene
d) Diplotene
Answer:
b) Interkinesis

Question 3.
Choose the only growth inhibiting plant hormone among the following options:
a) ABA
b) NAA
c) IAA
d) 2,4-D
Answer:
a) ABA

Question 4.
The process of conversion of molecular nitrogen to ammonia is termed as _____.
Answer:
Nitrogen Fixation

Question 5.
Observe the relation, and fill up the blank Trypanosoma: Flagellated Protozoan : Ciliated protozoan
Answer:
Paramecium

II. Answer any 9 questions from 6 to 16. Each carries 2 scores. (9 × 2 = 18)

Question 6.
Write any two economic uses of bryophytes.
Answer:
1) They Provide food for herbaceous mammals, birds and other animals
2) Peat moss(spagnum) is used as fuel and Packing material for trans-shipment of living materials

Question 7.
Observe the diagram and label the parts noted as A, B, C and D.

Answer:
A) Region of Maturation
B) Region of Elongation
C) Region of meristematic activity
D) Root cap’

Question 8.
What is the role of fungus in mycorrhiza?
Answer:
1) Fungal hyphae have large surface area, so it helps to absorb mineral ions and water from soil.
2) Pinus seeds cannot germinate and establish without the presence of micorrhizae.

Question 9.
Column A represents chromosomal behaviour during different sub-stages of Propose I of Meiosis I. Fill up the blanks in Column B.

Chromosomal behaviour (A)	Sub-stages (B)
a) Crossing over occurs	i)
b) Formation of Chiasmata	ii)
c) Pairing of homologous chromosomes	iii)
d) Chromosoems visible under light microscope	iv) Leptotene
e) Terminalisation of Chiasmata	v)

Answer:

Chromosomal behaviour (A)	Sub-stages (B)
a) Crossing over occurs	i) Pachytene
b) Formation of Chiasmata	ii) Diplotene
c) Pairing of homologous chromosomes	iii) Zygotene
d) Chromosoems visible under light microscope	iv) Leptotene
e) Terminalisation of Chiasmata	v) Diakinesis

Question 10.
The behaviour of plant cells with regard to water movement depends on the surrounding solution. Explain the changes occur in cells A and B.

Answer:
A) In hypotonic solution water diffuses into the cell causing the cytoplasm to build up turgor pressure against the cell wall and Cell become turgid

B) In hypertonic solution water moves out of the cell and protoplast withdraws from cell wall and shrinks. Due to this the Cell become Plasmolysed.

Question 11.
Plants that are adapted to dry tropical regions have the C4 pathway. Write any two advantages of C4 plants :
Answer:
1) They lacks Photorespiration
2) Photosynthetic yield or Productivity is high

Question 12.
Differentiate lactic acid fermentation from alcohol fermentation.
Answer:

Lactic acid fermentation	Alcohol fermentation.
The product is Lactic acid	The products are Ethanol and CO2
Lactate dehydrogenase is the enzyme involved	Pyruvic acid decarboxylase and alcohol dehydrogenase are the enzymes involved

Question 13.
Ethylene is one of the most widely used Plant Growth Regulator in Agriculture. Write any two agricultural applications of ethylene.
Answer:

1. Ethylene is a gaseous hormone promotes senescence and ripening of fruits.
2. It promotes horizontal growth of seedlings, swelling of the axis and apical hook formation in dicot seedlings

Question 14.
In glycolysis, ATP is utilized at two steps only. Write down these two steps.
Answer:

1. Glucose → Glucose 6 phosphate
2. Fructose 6 phosphate  → Fructose 1,6 biphosphate

Question 15.
Define, “The law of limiting factors”. Write any two external factors which directly affect the rate of photosynthesis.
Answer:
Blackman’s Law of Limiting Factors If a chemical process is affected by more than one factor, then its rate will be determined by the factor which is nearest to its minimal value

1. Light
2. Temperature

Question 16.
What is the difference between nitrification and denitrification in Nitrogen cycle?
Answer:
Nitrification is the formation of Nitrates from Ammonia by Nitrosomonas and Nitrobacter.
Denitrification is conversion of Nitrate in the soil to Nitrogen by Pseudomonas and Thiobacillus.

III. Answer any 3 questions from 17 to 20. Each carries 3 scores. (3 × 3 = 9)

Question 17.
C₄ plants have large cells around the vascular bundles of leaves called bundle sheath cells.
a) What is this anatomy called?
b) Write any two features of bundle sheath cells.
Answer:
a) Kranz anatomy
b) They are Large cells
They are arranged in several layers around vascular tissue

Question 18.
A and B are floral diagrams of two angiosperm families.
Answer:
a) A)Solanaceae
B) Liliaceae

b) A) Ovary is bicarpellary, syncarpous, superior, bilocular with axile placentation.
B) Ovary is tricarpellary, Syncarpous, Superior with axile placentation.

Question 19.
Following are the diagrams showing primary structure of dicot stem (A) and monocot stem (B). Write any three differences between them.

Answer:

A) Dicot Stem	B) Monocot Stem
Ground tissue is differentiated into cortex, endodermis, pericycle and pith	Undifferentiated Ground tissue
Collenchymatous hypodermis	Sclerenchymatous hypodermis
Vascular bundle is conjoint, open and endarch	Vascular bundles are conjoint and closed

Question 20.
Given below is the diagram of a cell organelle.
a) Identify the organelle.
b) Write any two functions of this organelle.

Answer:
a) Golgi apparatus

b) It helps in the Packaging of materials.
It is the site of synthesis of Glycoproteins and Glycolipids

Teachers recommend solving Kerala Syllabus Plus One Botany Previous Year Question Papers and Answers Pdf Board Model Paper 2021 to improve time management during exams.

Kerala Plus One Botany Board Model Paper 2021 with Answers

I. Answer any 3 questions from 1 to 6. Each carries 1 scroes. (3 × 1 = 3)

Question 1.
Fill imthe blank :
Network of hyphae in fungi is called .
Answer:
Mycelium

Question 2.
Name the plant hormone known as ‘Stress hormone’,
Answer:
Abscissic acid (ABA)

Question 3.
Choose the correct Answer from the bracket: AIDS in human being is caused by ______.
(a) Bacterium
(b) Fungus
(c) Virus
(d) Mycoplasma
Answer:
c) Virus

Question 4.
Fill in the blank:
Exchange of genetic materials between homologous chromosomes during Pachytene stage of Meiosis-I is called.
Answer:
Crossing over

Question 5.
Name the Pigment that gives pink colour to root nodules of Leguminous plants.
Answer:
Leghaemoglobin

Question 6.
Fill in the blank :
In Rhizophora certain roots grow vertically for breathing. Such roots are called ____ .
Answer:
Pneumatophores

II. Answer any 9 questions from 7 to 24. Each carries 2 scores. (9 × 2 = 18)

Question 7.
Complete the table with appropriate terms:
Classes
Chlorophyceae
(c)
Rhodophyceae

Common Name
(a)
Brown algae
Red algae

Major Pigments
Chlorophyll a,b
Chlorophyll a, c Fucoxanthin
Chlorophyll a, d (d)

Stored Food
(b)
Manitol Laminarin
Floredean starch
Answer:
(a) Green algae
(b) Starch
(c) Phaeophyceae
(d) Phycoerythrin

Question 8.
Write any two anatomical differences between stem and Root of Angiosperms.
Answer:
Stem
(a) Xylem is endarch
(b) Trichome is present Root
(a) Xylem is exarch
(b) Root hair is present

Question 9.
Write the difference between spring wood and autumn wood.
Answer:

1. Spring wood
   • Cambium is more active
   • Large quantity of xylem vessels are formed.
2. Autumn wood
   • Cambium is less active
   • Fewer quantity of xylem vessels are formed.

Question 10.
(a) Which plants are known as ‘Amphibians of the plant kingdom’ ?
(b) Give reason.
Answer:
a) Bryophytes
b) They are found in moist, cool and shaded localities and they require water for sexual reproduction.

Question 11.
Xylem is a conducting tissue seen in higher plants. Write the names of four elements of Xylem.
Answer:

1. Trachieds
2. Vessels
3. Xylem fibre
4. Xylem parenchyma

Question 12.
Phyllotaxy is the pattern of arrangement of leaves on stem of branch. Write the name of any two types of Phyllotaxy.
Answer:

1. Alternate phyllotaxy
2. Opposite phyllotaxy

Question 13.
(a) What is the name of the model of Plasma membrane proposed by Singer and Nicolson.
(b) Write any one function of Plasma membrane.
Answer:
a) Fluid mosaic model
b) It helps in the transport of solvent molecules.

Question 14.
(a) Define imbibition.
(b) Write one benefit of imbibition to plants.
Answer:
a) It is a kind of diffusion in which certain hydrophilic colloid molecules absorb water without forming solution.
b) It helps in the germination of seeds.

Question 15.
(a) Write the name of the stage of Mitosis in the given figure.
(b) Write one main event occurring in this stage.

Answer:
a) Anaphase
b) Chromosome move towards opposite poles of the cell

Question 16.
Write any two purposes of transpiration.
Answer:

1. It provides cooling effect
2. It helps in the absorption of water and Minerals.

Question 17.
Write any two differences between Cyclic and Non – cyclic photophosphorylation.
Answer:

Cyclic	Non cyclic
ATP produced	ATP & NADPH are produced
PSI involved	PSI and PS II are involved

Question 18.
(a) Identify and write the name of cell organelle given in the figure.
(b) Label the parts marked as A, B.

Answer:
a) Mitochondria
b) A – Matrix
B – Cristae

Question 19.
(a) Write the name of two phases of Photosynthesis.
Answer:
a) Light reaction and Dark reaction
b) Light reaction occur in Grana
Dark reaction occur in Stroma

Question 20.
(a) Write the name of the growth curve seen in the given figure.
(b) Write the name of phases marked as A and B.

Answer:
a) Sigmoid curve
b) A – Lag phase
B – Stationary phase

Question 21.
Match the following :

Cell organelle	Function
Lysosomes	Lipid Synthesis
Golgi apparatus	Store excretory products
Endoplasmic reticulum	Store hydrolytic enzymes
Vacuoles	Packaging of materials

(b) Which are the sites of these phases in chloroplast ?
Answer:
Lysosome – Store hydrolytic enzymes
Golgi apparatus – Packaging of materials
Endoplasmic reticulum – Lipid synthesis
Vacoules – Store excretory products

Question 22.
(a) What is fermentation?
(b) Which are the main products produced as a result of fermentation in (i) Yeast, (ii) Muscles?
Answer:
a) It is the anaerobic respiration that takes place in the presence of micro organism and give products.
b) Yeast – Ethyl alcohol and C02 Muscle – Lactic acid

Question 23.
Observe the figure of Calvin cycle given below:
(a) Write the name of three major events marked as A, B and C.
(b) Find out the name of first C02 acceptor given in the figure.

Answer:
a) A – Carboxylation
B – Reduction
C – Regeneration
b) RuBP

Question 24.
(a) What is ‘Kranz’ anatomy ?
(b) Write two examples of plants that exhibit ‘Kranz’ anatomy.
Answer:
a) In C₄ plants bundle sheath chloroplast are centripetally in arranged ring shape such a leaf anatomy is called Kranz anaotmy.
b) Sugarcane, Maize

III. Answer any 3 questions from 25 to 30. Each carries 3 scores. (3 ×3 = 9)

Question 25.
Flowers are classified into three types based on the position of floral parts on thalamus.
(a) Which are they ?
(b) Write the position of ovary in each one of them.
Answer:
a) Hypogynous
Perigynous
Epigynous

b) Hypogynous – ovary Superior Perigynous – ovary half inferior Epigynous – ovary inferior

Question 26.
(a) What is Respiratory Quotient (RQ)?
(b) Write the RQ of (i) Carbohydrate, (ii) Fat.
Answer:
a) It is the ratio of volume of C02 evolved to the volumeof oxygen consumed,
b) i) Carbohydrate 1 ii) Fat 0.7

Question 27.
The essentiality of an element to plants is determined by three criteria. Which are they?
(b) Write the site of this process in cell.
(c) Write the name of the end product of this process.
Answer:

1. It supports normal growth and reproduction.
2. Role of element must be specific.
3. Element is directly involved in metabolism.

Question 28.
(a) Name the process which is common for Aerobic and Anaerobic respiration.
(a) Write the name of plant hormone responsible for ripening of fruits.
(b) Write any two other functions of this hormone.
Answer:
a) Glycolysis
b) Cytoplasm
c) two molecules of Pyruvic acid

Question 29.
Observe the given figure of cell cycle
(a) Write the name of phases marked as A and BN A, B
(b) Write one important event in A and B.

Answer:
a) A – S phase
B – G2 phase

b) i) In S phase DNA replication occurs
ii) In G2 phase RNA and protein are produced and cell growth continues

Question 30.
(a) Write the name of plant hormone responsible for ripening of fruits.
(b) Write any two other functions of this hormone.
Answer:
a) Ethylene

b) It promote the production of female fowers in cucumbers. It promotes internodal elongation in deep water rice plants.

Teachers recommend solving Kerala Syllabus Plus One Botany Previous Year Question Papers and Answers Pdf Board Model Paper 2022 to improve time management during exams.

Kerala Plus One Botany Board Model Paper 2022 with Answers

Answer any three questions from 1 to 4. Each carries 1 score. (3 × 1 = 3)

Question 1.
Fill in the blank.
Reserve food of rhodophyceae is ____
Answer:
Floridean starch

Question 2.
Choose the correct answer.
Water loss in its liquid phase from the tip of grass blades is
(a) Guttation
(b) Osmosis
(c) Transpiration
(d) lmbibition
Answer:
A) Guttation

Question 3.
Name the special type of anatomy present in C₄ plants.
Answer:
Kranz anatomy

Question 4.
Fill in the blank.
The process of breakdown of glucose to pyruvic acid is called
Answer:
Glycolysis

II. Answer any 9 questions from 5 to 17. Each carries 2 scores. (9 × 2 = 18)

Question 5.
Write any two factors for seed dormancy.
Answer:

1. Impermeable and hard seed coat
2. Immature embryo

Question 6.
List out any four external factors affecting photo-synthesis.
Answer:
Light, CO₂ concentration, Temperature, Water.

Question 7.
Explain the significance of mitosis.
Answer:

1. It results in the production of diploid daughter cells with identical genetic constitution.
2. The growth of multicellular organisms.

Question 8.
What is measosome? Mention any two functions of mesosome.
Answer:
(a) Mesosomes are special membranous structure of bacteria which is formed by the extension of plasma membrane in to the cell.

1. They help in cell wall formation.
2. DNA replication and distribution to daughter cells.

Question 9.
Observe the figure of citric acid cycle given below. Identify (a), (b), (c) and (d) in the figure.

Answer:
A – citric acid,
B – alpha ketoglutaric acid,
C – succinic acid,
D – oxaloacetic acid

Question 10.
Name the four different compnents of phloem in angiosperms.
Answer:

1. Sieve tube
2. Companion cell
3. Phloem paraenchyma
4. Pholem fibre

Question 11.
Observe the figure of cell cycle given below.
a) Name the two phases of cell cycle.
b) Identify the stages (a) and (b) of the cell cycle.

Answer:
a) Interphase and M phase
b) (a) G1 phase,
(b) G2 phase

Question 12.
Differentiate Rough Endoplasmic Reticulum (RER) and Smooth Endoplasmic Reticulum (SER).
Answer:
RER – Rough endoplasmic reticulum with ribosomes on their surface. It is Involved in protein synthesis and secretion.
SER – Smooth endoplasmic reticulum devoid of ribosomes on their surface. It is involved in lipid synthesis.

Question 13.
What are bulli forms cells? Mention their function.
Answer:
In grasses, certain adaxial epidermal cells are large,empty,colourless cells.These are called bulliform cells. Due to water stress, they make the leaves curl inwards to minimise water loss.

Question 14.
Observe the figure and label the parts (a), (b) and (c). Write down the functions of root hairs.

Answer:
a) Region of Maturation
b) Region of Elongation
c) Region of Meristematic
Function – Absorption of water and minerals

Question 15.
Match the following.

Volvox	Bryophyte
Pinus	Algae
Salvinia	Gym nosperm
Marchantia	Pteridophyte

Answer:

Volvox	Algae
Pinus	Gymnosperm
Salvinia	Pteridophyte
Marchantia	Bryophyte

Question 16.
Define diatomaceous earth. Mention anyone use of diatomaceous earth.
Answer:
Dead remains of diatoms are known as ‘diatomaceous earth’. Used in polishing and filtration of oils and syrups.

Question 17.
Observe the figure and identify (1) and (2)

Answer:

1. Antiport
2. Symport

Answer any 3 questions from 18 to 22. Each carried 2 scores. (3 × 3 = 9)

Question 18.
Define phyllotaxy. Explain any two types of phyllotaxy.
Answer:
It is the mode of arrangement of leaves on the stem or branch.

1. Alternate – A single leaf at each node
2. Opposite – A pair of leaves at each node

Question 19.
Expalin the differnt steps involved in the formation of a root nodule in leguminous plants.
Answer:
(a) Rhizobium attaches root hair,
(b) Root hair curls
(c) Infected thread carries the bacteria to the inner cortex.
(d) The bacteria get modified into rod-shaped bacteroids and cause inner cortical and pericycle cells to divide.
(e) A mature nodule is complete with vascular tissues continuous with those of the root.

Question 20.
Give any three differences between aerobic respiration and fermentation.
Answer:

Aerobic respiration	Fermentation
Complete oxidation	Incomplete oxidation
Takes place in the presence of oxygen	Takes place in the absence of oxygen
Large amount of energy is released	Less amount of energy is released

Question 21.
The functions of different Plant Growth Regulators (PGR) are given.
Arrange them into respective columns.
• apical dominance
• bolting
• delay leaf senescence
• rooting of stem cutting
• overcome apical dominance

Auxin	Gibberellin	Cytokinin

Answer:

Auxin	Gibberellin	Cytokinin
Apical dominance	Bolting	Delay leaf senescence
Rooting of stem cutting	Increases the length of the stem	Overcome apical dominance

Question 22.
Observe the given diagram of LHC

a) Name the pigmenf that forms the reaction center.
b) Name any one accessory pigment involved in photosynthesis.
c) Mention the function of accessory pigment.
Answer:
a) Chlorophyll a

b) Chlorophyll b’or: Xanthophylls

c) • Absorb light and transfer the energy to chlorophyll a.
• It helps to protect chlorophyll a form photo oxidation.

Teachers recommend solving Kerala Syllabus Plus One Botany Previous Year Question Papers and Answers Pdf Board Model Paper 2023 to improve time management during exams.

Kerala Plus One Botany Board Model Paper 2023 with Answers

I. Answer any three questions from 1-5. Each carries 1 score. (3 × 1 = 3)

Question 1.
Observe the relationship between the first two terms and fill in the blank.
Mushroom : Agaricus
Bread mould : ________
Answer:
Rhizopus

Question 2.
All the tissues on the inner side of endodermis together constitute ______
Answer:
Stele

Question 3.
Complete oxidation of organic substance in the presence of oxygen is ______
Answer:
Aerobic respiration

Question 4.
Observe the figure given below. It shows two phases in the life cycle of Funaria. Identify and write the phase marked as ‘A’.

Answer:
Sporophytic stage

Question 5.
Name the enzyme present in plants which shows carboxylation and oxygenation activity.
Answer:
RuBisCO

II. Answer any 9 questions from 6-16. Each carries 2 scores. (9 × 2 = 18)

Question 6.
Diatoms, the chief producers in the ocean are useful in many ways. Evaluate the statement.
Answer:
Cell wall remains of diatoms in ocean floor is called Diatomaceous earth if is used in polishing, filtration of oils and syrups.

Question 7.
An important model of the structure of plasma membrance was proposed by Singer and Nicolson.
(a) What is this model called?
(b) Which component forms bilayer?
(c) Identify and write the two types of proteins present in plasma membrane.
Answer:
(a) Fluid mosaic model.
(b) Phospholipids.
(c) Integral protein and peripheral protein

Question 8.
Observe the following phases of nuclear divisions during mitosis and answer the following questions.

(a) Name the two phase ‘A’ and ‘B’
(b) What are the main events occurring in ‘A’ phase?
Answer:
(a) A- Anaphase.
B – Telophase.

(b) • Centromeres split and chromatids separate.
• Chromatids move to opposite poles of the cell

Question 9.
Give the scientific term for the following.
(a) Pairing of homologous chromosomes.
(b) Echange of genetic material between two homologous chromosomes.
Answer:
(a) Synapsis.
(b) Crossing over.

Question 10.
Match the following:

A	B
Prothallus	Mosses
Coralloid roots	Gametophyte
Floridean starch	Cycas
Protonema	Red algae

Answer:

A	B
Prothallus	Gametophyte
Coralloid roots	Cycas
Floridean starch	Red algae
Protonema	Mosses

Question 11.
Rough Endoplasmic Reticulum (RER) and Smooth endoplasmic Reticulum (SER) are morphologically and functionally different. Justify this statement.
Answer:

A	B
Endoplasmic reticulum bearing ribosomes on their surface is called RER.	Endoplasmic reticulum devoid of ribosomes on their surface is called SER.
RER is involved in protein synthesis and secretion	SER is involved in synthesis of lipids and steroid hormones

Question 12.
Observe the given graph. The graph represents the phases of growth.

(a) Name the growth curve.
(b) Name the different phases of growth represented as (a), (b) and (c).
Answer:
a) Geometrical growth curve
b) (a) Lag phase.
(b) Log or.exponential phase.
(c) Stationary phase

Question 13.
Fermentation is the incomplete oxidation of pyruvic acid. Find the difference between two types of fermentation in microorganisms.
Answer:

Alcoholic fermentation	Lactic acid fermentation
The product formed are CO2 and ethyl alcohol.	The product formed is Lactic acid
Alcoholic fermentation is carried out by Yeast.	Shown by Lactobacillus bacteria and Muscle cells.

Question 14.
Observe the following diagram a, b, c, d identify the placentation.

Answer:
(a) Marginal placentation.
(b) Axile placentation.
(c) Parietal placentation.
(d) Free central placentation.

Question 15.
Choose the appropriate function from the bracket and fill the blank against each plant hormone in the table. (Ripening of fruits, Increase the length of stem in sugarcane, Induce parthenocarpy, Helps to overcome apical dominance)

Plant hormone	Function of hormone
Auxin
Gibberellins
Cytokinin
Ethylene

Answer:

Plant hormone	Function of hormone
Auxin	Induce parthenocarpy
Gibberellins	Increase the length of stem in sugarcane
Cytokinin	Helps to overcome apical dominance
Ethylene	Ripening of fruits

Question 16.
(a) Which is the special leaf anatomy seen in C₄ plants?
(b) Productivity and yield are better in C₄ plants than C₃ plants. Why?
Answer:
(a) Kranz anatomy
(b) They lack a process called photo-respiration.
They can fix CO₂ in low atmospheric CO₂ concentration.
They can tolerate higher temperature conditions

III. Answer any 3 questions from 17-20. Each carries 3 scores. (3 × 3 = 9)

Question 17.
The following are the anatomical features of flowering plants. Arrange these features in the table given below.
i) Exarch xylem
ii) Presence of hypodermis
iii) Palisade parenchyma
iv) Conjoint and open vascular bundle
v) Endodermis with casparian strips
vi) Large empty bulliform cells

Stem	Root	Leaf
Presence of hypodermis	Exarch xylem	Palisade parenchyma
Conjoint open bundle	Endodermis with casparian strips	Large empty bulliform cells

Question 18.
Observe the figure ‘A’ and ‘B’ and answer the questions.
Img- 1
(a) Define venation.
(b) Name and explain the type of venation in ‘A’ and ‘B’.
Answer:
(a) The arrangement of veins and veinlet in the leaf lamina is called venation.

(b) A’ – Reticulate Venation: Vein and veinlet form a network on leaf lamina. eg. dicotyledonous plants.
‘B’- Parallel Venation: Vein and veinlet run parallel to each other on leaf lamina. eg. monocotytedonous plants.

Question 19.
Photophosphorylation takes place during photosynthesis.
(a) Name the two types of photophos-phorylations.
(b) Mention the differences between them.
Answer:
(a) Cyclic Photophosphorylation Non cyclic Photophosphorylation
(b)

Cyclic photo – phosphorylation	Non-cyclic photo-phosphorylation
Electrons are transported in cyclic manner	Electrons are „ transported in non- cyclic manner.
Only PS -I is involved	Both PS-I and PS-II are involved
Only ATP is produced	Both ATP and NADPH+H* are produced.
Photolysis of water is absent	Photolysis of water is present
Oxygen is not liberated	Oxygen is liberated

Question 20.
Glycolysis is the partial oxidation of glucose to produce 2 molecules of pyruvic acid
(a) Where does glycolysis occur?
(b) Steps of glycolysis are given below. Write the name of compounds marked as (a), (b), (c) and (d).

Answer:
(a) Cytoplasm
(b) (a) Fructose-6-phosphate
(b) 3-phosphoglyceric acid
(c) Phosphoenolpyruvate
(d) Pyruvic acid

Teachers recommend solving Kerala Syllabus Plus One Botany Previous Year Question Papers and Answers Pdf March 2019 to improve time management during exams.

Kerala Plus One Botany Previous Year Question Paper March 2019

Answer all questions from question numbers 1 to 3. Each carry 1 score. (3 × 1 = 3)

Question 1.
Choose the Correct answer.
A structure seen in bacterial cell is _______
a) Nucleus
b) Lysosome
c) Plastid
d) Mesosome
Answer:
d) Mesosome

Question 2.
Observe the relationship between the first two terms and fill in the blank.
a) Mushroom : Agaricus
b) Bread mould :
Answer:
b) Rhizopus

Question 3.
Fill in the blank:
Cytokinesis in animal cell takes place by the ap-pearance of a in the plasma membrane.
Answer:
Cleavage furrow

Answer any nine questions from 4 to 14. Each carries two score. (9 × 2 = 18)

Question 4.
Observe the figure given below.

Identify the process demonstrated in the figure. Write the role of membrane in this process.
Answer:
Osmosis,
Active transport and passive transport occurs

Question 5.
Certain thylakoid pigments are called accessory pigments. Name them, Write their significance.
Answer:

1. Chlorophyll b, xanthophylls and carotene
2. Protect chlorophyll a molecule from photo-oxidation.

Question 6.
Notice the three simple tissues given below.
a) Sclerenchyma
b) Parenchyma
c) Collenchyma
Identify and write the tissue that consists of cells that are thickened at the corners. Write the function of this tissue.
Answer:
c) Collenchymas
• It provides mechanical support

Question 7.
Write any two differences between aerobic respira-tion and anaerobic respiration.
Answer:

1. Aerobic respiration takesplace in cytoplasm and mitochondria with the help of oxygen
2. Anaerobic respiration takesplace in cytoplasm without the use of oxygen

Question 8.
Observe the figure given below. It shows two phases in the life cycle of a plant.

Identify the phase marked as A. Write any two peculiarities of this state.
Answer:

1. A-sporophytic generation
2. It is diploid stage.it produces spores

Question 9.
Karyokinesis of mitosis is divided into fourstages. Name the second and third stage. Write any two features of second stage.
Answer:

1. 2nd metaphase, 3rd anaphase
2. Chromosomes are arranged at equator
3. Spindle fibres are attached to kinetochore of chromosomes

Question 10.
Observe the figure given below.

Identify the parts a, b. Write their functions.
Answer:
a) Grana
b) Stroma
• In grana light reaction takesplace and energy rich molecules are produced
• In sroma dark reaction takesplace and energy rich molecules are utilized

Question 11.
C₄ plants have a special leaf anatomy. Name that antomy. Write three peculiarities of this kind of anatomy.
Answer:

1. Kranz anatomy
2. Two types of chloroplast present
3. Bundle sheath chloroplast is large and agranal

Question 12.
Observe the figure given below.

Name the complex. Write its functions, go
Answer:

1. ATP synthase complex
2. It act as proton channel and oxidative phosphorylation takesplace.

Question 13.
Observe the elements given below.
Copper, Phosphorus, Boron, Magnesium, Potassium, Manganese, Chlorien Choose microelements from the above.
Answer:
Copper, boron, manganese and chlorine

Question 14.
Match the items of column A with B

A	B
a) Reduction	i) Formation of oxygen
b) Photolysis	ii) Formation of 3-PGA
c) Photorespiration	iii) Formation of PEP
d) Carboxylation	iv) Formation of glucose
	v) Formation of phosphoglycolate

Answer:

A	B
a) Reduction	formatipn of glucose
b) Photolysis	formation of oxygen
c) Photorespiration	formation of phosphoglycolate
d) Carboxylation	formation of 3PGA

Answer any three questions from 15 to 18. Each carries three score. (3 × 3 = 9)

Question 15.
Write thee peculiarities of gynoecium seen in solanaceae and fabaceae.
Answer:

1. Solanaceae – bicarpellary, syncarpous and superior ovary with axile placentation
2. Fabaceae – monocarpellary, superior or half inferior ovary with marginal placentation

Question 16.
Plantgrowth regulators perform various functions in piant body.
a) Name the hormones responsible for apical dominance and bolting. Define the two phenomena.
b) Which plant hormone is referred to as an antagonist to gibberellic acid?
Answer:

1. Apical dominance-auxin Bolting-gibberellins
2. Apical dominance-Growth of apical bud inhibit the growth of lateral bud
3. Bolting-internodal elongation just prior to flowering

Question 17.
Name of three plants are given below.
a) Rhizophora eeognragnnoo
b) Bougainvillea aaiMaracnlnflgj
c) Pea oKoxd a.ajs1
Name the modifications seen in these plants. Write theirfunctions.
Answer:
a) Rhizophora-pneumatophore
• It helps in respiration

b) Bougainvillea-thorn
• It acts as defense structure

c) Pea-leaf tendril
• It helps in climbing

Question 18.
Observe the terms given below.
Xylem, Root hairs, Pith, Stomata, Cambium, Bulliform cells. From this, identify and write the structures seen in epidermal tissue system. Write their functions. (Hint: 3 structures)
Answer:

1. Root hair : absorption of water and minerals
2. Stomata : helps in gaseous exchange
3. Bulliform cells : it helps in rolling and unrolling of lamina.This help to reduce transpiration rate.

Teachers recommend solving Kerala Syllabus Plus One Botany Previous Year Question Papers and Answers Pdf March 2020 to improve time management during exams.

Kerala Plus One Botany Previous Year Question Paper March 2020

Part – A

I. Answer any 3 questions from 1 to 5. Each carries 1 score. (3 × 1 = 3)

Question 1.
Choose the correct answer. The organelle known as power house of the cell is :
a) Ribosome
b) Vacuole
Answer:
Mitochondria

Question 2.
Choose the correct answer
Caspanan strips are present in:
a) Dicot root
b) Dicot stem
c) Dicot leaf
d) Monocot stem
Answer:
Dicot root

Question 3.
Observe the figure given below. Name the Organism.

Answer:
Euglena

Question 4.
Observe the relationship between the first two terms and fill in the blank.
Metaphase : Spindle fibres attach to kinetochores.
_______ : Chromatids move to opposite poles
Answer:
Anaphase

Question 5.
Fill in the blank.
The number of carbon atoms in acetyl co-enzyme A, which take part in Kreb’s cycle is ______ .
Answer:
2

II. Answer any 9 questions from 6 to 16. Each carries 2 scores. (9 × 2 = 18)

Question 6.
Observe the figure given below:

a) Name the process.
b) Define the above identified process.
Answer:
a) Facilitated diffusion
b) In facilitated diffusion, special membrane proteins help the movement of substances across membranes without expenditure of ATP or energy

Question 7.
Analyse the table given below and fill in the blanks.

A	B
Zygotene	(a)
(b)	Crossing over
(c)	Dissolution of synaptonemal complex
Diakinesis	(d)

Answer:
a) Pairing of homologous chromosomes
b) Pachytene
c) Diplotene
d) Terminalisation of Chiasmata

Question 8.
Define hydroponics. Write one advantage of it.
Answer:
This technique of growing plants in a nutrient solution is known as hydroponlbs. In this method essential elements are used and their deficiency symptoms can be studied.

Question 9.
Peculiarities of certain cell organelles are given below:
a) Involved in protein synthesis.
b) Made up of many flat, disc shaped sacs or cisternae.
c) Bear ribosomes on their surface.
d) Rich in hydrolytic ensymes.
e) Membrane is absent

Copy the table given below and write the above pecularitie column.

Lysosome	Golgi apparatus	Ribosome

Answer:

Lysosome	Golgi apparatus	Ribosome
d) Rich in hydrolytic enzymes Golgi apparatus	b)Made up of many flat disc	a) Involved in protein synthesis e) Membrane is Absent

Question 10.
Analyse the table given below and fill in the blanks a, b, c, d

Processes	Cyclic photo phosporylation	Non-cyclic phtotopho sphorylat ion
Movement of electrons	Cyclic	(a)
Number of photosy-stems	(b)	(c)
Splitting of water	(d)	(d) Present

Answer:

Processes	Cyclic photo phosporylation	Non-cyclic phtotophosp horylation
Movment of electrons	Cyclic	(a) Non-cyclic
Number of phot-osystems	(b) 1, PS I	(c) 2, PS I & PS II
Splitting of water	(d) Absent	present

Question 11.
The first step in respiration is glycolysis.
a) Define glycolysis.
b) Write the site of glycolysis.
Answer:
a) It is the Partial oxidation of glucose into 2 molecules of Pyruvic acid.
b) Cytoplasm

Question 12.
Observe the given figure showing C₄ pathway.
Atmospheric CO₂

a) Identify the cells A and B.
b) Name the C₄ acid formed through this pathway.
c) Name the enzyme involved in the formation of C₄ acid.
Answer:
a) It is the Partial oxidation of glucose into 2 molecules of Pyruvic acid.
b) Cytoplasm

Question 13.
Aerobic respiration and anaerobic respiration are two types of respiration.
a) What is anaerobic respiration?
b) Write the change that occurs to pyruvic acid in yeast cells.
Answer:
a) Anaerobic respiration is the respiration taking place without the involvement of oxygen.
b) Pyruvic acid is converted to Ethanol and CO₂

Question 14.
Notice the three stages of Calvin cycle given below:
a) Arrange the above stages in correct order.
b) Kelvin cycle is also known as C₃ cycle (Pathway). Give reason.
Answer:
a) Carboxylation, Reduction, Regeneration
b) First CO₂ fixation product is a C₂ acid or 3PGA. Hence it is called as C₂ cycle

Question 15.
Match the items of column A with B :

A	B
a) Double fertilisation	i) Bryophte
b) Heterospory	ii) Algae
c) Protonema	iii) Gymnosperm
d) Naked seeds	iv) Angios sperm

Answer:

A	B
a) Double fertilisation	v) Angiosperm
b) Heterospory	iv) Pteridophyte
c) Protonema	i) Bryophyte
d) Naked seeds	iii) Gymnosperm

Question 16.
Cell theory was formulated by two scientists.
a) Name the scientists.
b) Write the two main points in cell theory.
Answer:
a) Schleiden and Schwann
b)
1. All living organisms are composed of cells and their products
2. All cells arise from pre-existing cells

III. Answer any 3 questions from 17 to 20. Each carries 3 scores. (3 × 3 = 9)

Question 17.
Observe the figures A and B.

a) Identify the aestivation A and B.
b) Write one peculiarity of A.
c) Name the three kinds of petals in B.
Answer:
a) A.Twisted
B. Vexillary
b) In twisted aestivation, the one margin of the appendage overlaps the next one and so on .
c) In this the largest petal (standard petal) overlaps the two lateral petals (wing petals) which in turn overlap the two smallest anterior petals (keel petals)

Question 18.
The plant growth regulators are divided into growth promoters and growth inhibitors.

a) Name the three hormones, which are known as plant growth promoters.
b) Name the growth inhibitor which is known as ‘stress hormone’.
c) Write any two roles of the above identified stress hormone.
Answer:
a) Auxin, Gibberellin, Cytokinin
b) Abscisic acid (ABA)
c) 1) It promotes abscission and dormancy.
2) It acts as inhibitor of plant metabolism

Question 19.
Observe the figures A and B given below:

a) Name the type of venation in A and B.
b) Define venation.
Answer:
a) A.Reticulate
B. Parallel
b) Arrangement of veins and veinlets in the lamina of leaf

Question 20.
Observe the figure given below:

Write any three features on mesophyll cells from the figure.
Answer:

1. Mesophyll possesses chloroplasts of two types palisade parenchyma and spongy parenchyma.
2. Numerous large space and air cavities are found between spongy cells.
3. Palisade parenchyma arranged to wards daxial side.