CSS Zoology Past Paper 2004
Paper-I
PART-2(Subjective) 80 Marks
Attempt ONLY FOUR Questions from PART-II. (20×4)
PART-II
SECTION-I
Q. No. 2
(a) Give a brief account of pathogenic protozoa.
(b) Describe different types of canal system found in sponges.
(c) “In Tapeworm, true segmentation is absent.” Comment on this statement.
Q. No. 3
(a) “Polyp and medusa are strictly homologous structures.” Justify the statement.
(b) Tracheal apparatus of insects and those of arachnids are essentially different. Discuss the above statement.
(c) Give an account of podium in mollusca.
Q. No. 4 Write short notes on the following:
(a) Schizocoel
(b) Secondary segmentation
(c) Echinoderm larvae
(d) Water vascular system in echinoderms
SECTION-II
Q. No. 5
(a) “Hemichordata should not be included in Chordata.” Justify the statement.
(b) “Amphioxus is certainly related to ancestral vertebrates.” Comment upon the statement.
Q. No. 6
(a) Discuss the evolution of aortic arches in different vertebrate groups.
(b) Discuss birds as a flying machine.
Q. No. 7
(a) Briefly describe the structure, formation, and function of the placenta in mammals.
(b) Amplify the statement that monotremes show a mixture of mammalian and reptilian characters.
Paper-II
PART-2(Subjective) 80 Marks
Attempt ONLY FOUR Questions from PART-II. (20×4)
PART-II
Q. No. 2
(a) Give a diagrammatic representation of the structure of the mitochondrion and its molecular skeleton to show its association with electron transport and oxidative phosphorylation.
(b) Define “Respiration,” and explain “external” and “internal” respiration. How do the air conducting passageways and the respiratory membranes function to achieve these goals?
Q. No. 3
(a) How are “genetic maps” of chromosomes constructed in Drosophila? What techniques should be used in humans for this purpose? Could “natural selection” alone produce “speciation” in natural populations?
Q. No. 4
(a) Differentiate between physical and chemical regulation of body temperature.
(b) Explain the meaning of “conduction,” “convection,” and “radiation” in relation to the loss of heat from the body.
Q. No. 5
(a) Is there any truth in “Neo-Lamarckism”? How does the “Baldwin effect” fit into this concept?
(b) Briefly describe polyploidy as a method of the origin of species.
Q. No. 6
(a) Differentiate between immunity against a disease and resistance against a pesticide in natural populations.
(b) Define “industrial melanism.” Explain why in a polluted area near Birmingham, U.K., most specimens of the peppered moth are melanistic, while in the countryside, these are typically light-colored.
Q. No. 7
(a) Define “pesticidal pollution.” How does it affect human health?
(b) Show how the complementary interactions of two independent pairs of alleles in seed color in corn or coat color in rodents modify the “Mendelian ratio” of independent assortment. Do these modified ratios disprove “Mendelian’s second law of independent assortment”?
Q. No. 8
Write short notes on the following:
(a) Genetic drift
(b) Aggressive mimicry
(c) Acid rain
(d) Chemogeny