👉 Download Biology Question Paper PDF - SET 8
PART A: BOTANY
I. Answer any 3 questions from 1 – 5. Each carries 1 score. (3 x 1 = 3)
✅ Conjunctive tissue
✅ Tonoplast
✅ Telophase
a) Xanthophyll b) Carotenoids
c) Chlorophyll b d) Chlorophyll a
✅ Chlorophyll a
✅ Hans Krebs
II. Answer any 9 questions from 6 – 16. Each carries 2 scores. (9 x 2 = 18)
✅ Answer
Euglena.Features:
• Instead of a cell wall, they have a protein rich layer called pellicle. It makes their body flexible.
• They have two flagella, a short and a long one.
✅ Answer
• Flagella are not present in gamete and spores.• Red pigment r-phycoerythrin is present.
• Stored food-Foridean starch is present.
✅ Answer
• Mycorrhiza: It is the symbiotic association of algae and fungi.• Coralloid root: It is theassociation of fungus with root.
(b) ………………. were discovered as kinetin from the autoclaved herring sperm DNA.
✅ Answer
(a) In plants, Ethylene promotes fruit ripening. It enhances respiration rate during fruit ripening. This is called respiratory climactic.(b) Cytokinins
✅ Answer
In amphibolic pathway, both catabolism and anabolism are involved.In respiratory pathway, fat is breakdown into fatty acid and glycerol, fatty acid again splits into acetyl coA. If body require the synthesis of fat, acetyl coA withdraws from pathway and used in the synthesis of fat.
✅ Answer
In alcoholic fermentation, glucose undergoes incomplete oxidation in the presence of yeast and forms ethyl alcohol and CO2.In lactic acid fermentation, glucose undergoes incomplete oxidation in the presence of lactobacillus and forms lactic acid.
i) ABAii) NAA
iii) IAA
iv) IBA
b) List some physiological responses of gibberellins in plants.
✅ Answer
a) ABAb) 1) GA3 increases the length of grapes stalks.
2) Gibberellins elongate and improve the shape of fruits like apple.
3) They delay senescence.
4) GA3 is used to speed up the malting process in brewing industry.
✅ Answer
⊕ - Actinomorphic⚥ - Bisexual
K - Calyx
C - Corolla
A - Androecium
G - Gynoecium
a) Name the accessory pigments in plant leaves.
b) Mention any one function of accessory pigments.
✅ Answer
(a) Chlorophyll b, Xanthophylls and Carotenoids.(b) Functions of accessory pigments:
o They absorb light at different wavelength and transfer the energy to chlorophyll a.o They protect chlorophyll a from photo-oxidation.
✅ Answer
✅ Answer
Placentation is the arrangement of ovules on the placenta within the ovary.A= Parietal
B= Free central
III. Answer any 3 questions from 17 – 20. Each carries 3 scores. (3 x 3 = 9)
b) Illustrate the major advantages of C4 plants over C3 plants.
✅ Answer
a) Kranz anatomy.b) C4 plants are photosynthetically efficient than C3 plants because energy wasteful process photorespiration occurs in C3.
C4 plants can tolerate high temperature conditions than C3 plants.
i) Leptoteneii) Zygotene
iii) Pachytene
iv) Diplotene
b) Summarize the significance of meiosis in sexually reproducing organisms.
✅ Answer
a) Pachyteneb) 1) Meiosis conserves the specific chromosome number of each species across generations in sexually reproducing organisms.
2) It results in reduction of chromosome number by half.
3) It increases the genetic variability from one generation to the next.
4) Variations are very important for the process of evolution.
✅ Answer
Fluid mosaic model of cell membrane:According to this, the quasi-fluid nature of lipid enables lateral movement of proteins within the overall bilayer. It consists of lipid bilayer. They are arranged within the membrane with the polar head towards the outer sides and the hydrophobic tails towards the inner part. The peripheral proteins lie on the surface of membrane while the integral proteins are buried in the membrane.
i) Radial and polyarch xylem bundlesii) Parenchymatous (homogenous) cortex
iii) Large pith
iv) Epidermis with epidermal hairs
v) Pericycle
vi) Endodermis with casparian strips
a) Identify the T.S.
b) Re-arrange the given regions from the periphery to the centre in their correct sequence.
c) Give an account of casparian strips.
✅ Answer
a) Monocot rootb)
iv) Epidermis with epidermal hairsii) Parenchymatous (homogenous) cortex
vi) Endodermis with casparian strips
v) Pericycle
i) Radial and polyarch xylem bundles
iii) Large pith
c) The tangential and radial walls of the endodermal cells of roots have a deposition of water-impermeable, waxy material suberin in the form of casparian strips.
PART B: ZOOLOGY
I. Answer any 3 questions from 1 – 5. Each carries 1 score. (3 x 1 = 3)
a) Insulin: Hypoglycemic hormone
.....................: Hyperglycemic hormone.
b) Over secretion of Growth hormone: Gigantism
Low secretion of Growth hormone: ……………….
✅ (a) Glucagon (b) Dwarfism
✅ Lecithin
Hilum leads to funnel shaped cavity called ………………. with projections called calyces.
✅ Renal pelvis
(a) Cat (b) Lion
(c) Leopard (d) Tiger
✅ (a) Cat
✅ Spirometer
II. Answer any 9 questions from 6 – 16. Each carries 2 scores. (9 x 2 = 18)
a) Radula b) Cnidoblast
c) Pneumatic bone d) Proboscis gland
✅ Answer
a) Molluscab) Cnidaria
c) Chordata – Aves
d) Hemichordata
a) What are the two types of metabolites in cells?
b) Give an example for each type of metabolites.
✅ Answer
a) Primary metabolites & secondary metabolites.b) Primary metabolites: Amino acids, protein, carbohydrate etc.
Secondary metabolites: Alkaloids, terpenoids etc.
“The phylum includes the comb jellies, also called walnuts. They are noted for their bioluminescence and comb plates.”
a) Identify the phylum.
b) What is meant by bioluminescence?
c) What is the function of comb plates?
✅ Answer
(a) Ctenophora(b) Bioluminescence is the ability of organisms to emit light from the body.
(c) Locomotion.
✅ Answer
A= Vasa efferentiaB= Testis
C= Urinogenital duct
D= Cloaca
a) Justify the statement.
b) Define cardiac cycle and cardiac output.
✅ Answer
a) SA node initiates, regulate and maintains heart beat.b) Cardiac cycle: Sequence of events during the completion of one heart beat (systole and diastole).
Cardiac output: Volume of blood pumped by each ventricle per minute.
✅ Answer
a) Which theory explains the process of muscle contraction?
b) Identify two contractile proteins seen in muscle.
✅ Answer
a) Sliding filament theory.b) Actin and Myosin.
✅ Answer
In Urochordata, notochord is present only in larval tail.In Cephalochordata, it extends from head to tail region and is persistent throughout their life.
a) Find out the pO2 at which 90% saturation of haemoglobin with oxygen occurs.
b) Write any three factors that favours dissociation of Oxyhaemoglobin.
✅ Answer
a) 60 mmHgb) low pO2, high pCO2, high H+ ions, high temperature.
✅ Answer
• The substrate binds to the active site of enzyme (E+S).• The substrate is tightly bound with active site of enzyme to form enzyme- substrate complex (ES).
• The active site breaks chemical bonds of substrate to form enzyme- product complex (EP).
• The enzyme releases the products (E+P).
✅ Answer
Insulin decreases blood glucose level (hypoglycemic hormone) and Glucagon increases blood glucose level (hyperglycemic hormone).Likewise, PTH increases Ca2+ level in blood (hypercalcaemic hormone). Calcitonin decreases Ca2+ level in blood (hypocalcaemic hormone).
Thus PTH and TCT are antagonistic in action.
III. Answer any 3 questions from 17 – 20. Each carries 3 scores. (3 x 3 = 9)
✅ Answer
Impulse reaches at axon terminal → synaptic vesicles bind on plasma membrane → release of neurotransmitter → It diffuses across synaptic cleft → combine with receptors on the post synaptic membrane → opening of ion channels allowing entry of ions → generates action potential.
✅ Answer
a) Do you agree with this statement?
b) Justify your answer with suitable reasons.
✅ Answer
a) Yes.b) ADH is produced by hypothalamus. It regulates the kidney function by constricting blood vessels and helping in water reabsorption.
JGA is found in the distal convoluted tubule. A fall in GFR activate the JG cells to release renin which stimulate the glomerular blood flow.
ANF is found atrial wall of heart. It causes vasodilation (dilation of blood vessels) and thereby decrease the blood pressure.
✅ Answer
