CSS Zoology Past Paper 2012
Paper-I
PART-2(Subjective) 80 Marks
Attempt ONLY FOUR Questions from PART-II by selecting TWO questions from EACH
SECTION. (20×4)
PART-II
SECTION-I
Q. No. 2
(a) Define parasitism. What are parasitic adaptations in platyhelminthes?
(b) Discuss water circulating pathways in:
(i) An ascon sponge
(ii) Sycon Sponge
(iii) Leucon Sponge. Illustrate answer with diagrams.
Q. No. 3
(a) Describe parasitism in Protozoa.
(b) What are corals and coral reefs? What are different types of coral reefs? Discuss. Give suitable diagrams.
Q. No. 4
(a) Describe feeding in bivalves and the mechanism of food movement in the cephalopod digestive tract. Does it differ (cephalopod) from other molluscs?
(b) Give an account of appendages and body divisions in crayfish. Provide suitable diagrams.
SECTION-II
Q. No. 5
(a) What are the variations in vertebrae in fishes, amphibians, reptiles, birds, and mammals? Provide diagrams.
(b) Describe pronephros, mesonephros, and metanephros kidneys in vertebrates. Illustrate answer with diagrams.
Q. No. 6
(a) Discuss with suitable diagrams Amniote aortic arches.
(b) Give a description of the primitive vertebrate heart and its diagram.
Q. No. 7
(a) Describe Reflex arc and its action in the mammalian spinal cord. Provide diagrams.
(b) Give a brief comparative account of the structure of the brain in fish, Amphibia, reptiles, birds, and mammals. Provide suitable diagrams.
Q. No. 8
(a) Give a brief account of the biting mechanism in snakes. Provide a suitable diagram.
(b) Provide diagrams while giving an account of different types of vertebrate eggs.
Paper-II
PART-2(Subjective) 80 Marks
Attempt ONLY FOUR Questions from PART-II by selecting TWO questions from EACH
SECTION. (20×4)
PART-II
SECTION-I
Q. No. 2
(a) Describe the structure and function of ribosomes.
(b) Describe the structure and function of the endoplasmic reticulum.
Q. No. 3
(a) In the respiratory mechanism, explain the transport of oxygen in the arterial blood.
(b) How does the transport of carbon dioxide in blood take place? Explain.
Q. No. 4
(a) Under what conditions are the following phenotypic ratios obtained:
(i) 9:7
(ii) 9:3:4
(iii) 13:3
(iv) 9:3:3:1
(b) Explain the following chromosomal aberrations and their evolutionary significance:
(i) Deficiency
(ii) Duplication
(iii) Translocation
(iv) Inversion
Q. No. 5
(a) Describe in detail glomerular filtration and glomerular filtrate. Illustrate your answer with suitable diagrams.
(b) Discuss absorption in the small intestine of different food constituents like carbohydrates, fats, water, and lipids. Provide suitable diagrams.
SECTION-II
Q. No. 6
(a) What is the role of natural selection in the biological process? Explain.
(b) How would you compare Lamarck’s theory of evolution and Darwin’s concept of evolution? Explain.
Q. No. 7
(a) Explain pond ecosystem with reference to:
(i) Abiotic substances
(ii) Producer organisms
(iii) Consumer organisms
(iv) Decomposers
(b) Give a description of biogeochemical cycles:
(i) Nitrogen cycle
(ii) Phosphorus cycle
Q. No. 8
(a) Explain the important features of Watson and Crick’s model of DNA.
(b) Explain transcription and the role of messenger RNA.
Q. No. 9
(a) Write short notes on:
(i) Linkage
(ii) Habitat
(iii) Biological species
(iv) Gene mutation