Paper : IFS - Indian Economic Service Zoology Previous Year Paper (II) (2003)

Paper-II : SECTION A
1. Distinguish between any four of the following: (Each answer may be in about 150 words) (10 x 4 = 40)
(a) Active and Passive transport across cell membrane
(b) Radiation and Chemical mutagenesis
(c) Sympatric and Allopatric speciations
(d) Missence and Nonsense mutations
(e) Mitochondria and Chloroplasts

2. Explain in details with suitable diagrams, the process of meiotic cell division with reference to a cell within 2N=4. Give biological significance of meiosis. (40)

3. What is an operon? Explain the structure and regulation of the lactose operon. (40)

4. Write notes on the following: (10 x 4 = 40)
(a) Haldane-Oparin hypothesis on origin of life
(b) Evolution of elephant
(c) Five kingdom classification and its basis
(d) Hardy-Weinberg law-its proof and applications

SECTION B
5. Distinguish between any four of the following (each answer may be in about 140 words): (10 x 4 = 40)
(a) Glycolysis and Citric acid cycle
(b) Digestion in stomach and in intestine
(c) Blastula of frog and of chick
(d) Metamorphosis in insect and in frog
(e) Starch and Glycogen

6. What are enzymes ? Explain their characteristics. Give the basis of their classification with appropriate example of eachclass. (40)

7. Explain the terms ‘resting’ and ‘action’ potentials. Describe how a nerve impulse travels along a neuron mentioning roles of different ion channels and gates. (40)

8. With suitable examples discuss the role of cytoplasm and nucleus in the process of early embryonic development. (40)