WEST BENGAL CIVIL SERVICE
EXAMINATION - 2005
Zoology Paper-II
Time Allowed-3 Hours Full Marks-100
Group - A
(Answer any three questions.)
1. (a) Draw and describe the structure of fluid-mosaic model of Plasmalemma. What is fluid in it ? 13+2
(b) Distinguish between Ribosome and Lysosome. 5
2. What is fate map ? State the significance of fate map. Describe the process of gastrulation in chick. 2+2+16
3. Give the actual chemical name and structure of urea. What do you mean by ammonotelic, ureotelic and uricotelic animals. Describe the chemical cycle with structures by which urea is produced in mammals. 2+2+6+10
4. Comment on (any four) : 5x4
(a) Cytoplasmic inheritance
(b) Sex-limited trait
(c) Cloning
(d) Colour-blindness
(e) PCR
5. Distinguish between : 4x5
(a) Holotype and paratype
(b) Colouration and mimicry
(c) Poikilothermic and homeothermic
(d) Classification and identification
(e) Spermatogenesis and oogenesis
6. (a) What is replication ? Briefly describe the semiconservative mothod of replication. 2+8
(b) Give a short account of Down's syndrome. 10
7. Write a brief account on the evolution of Horse. 20
Group—B
Answer any two questions.
8. (a) What is Glycogenesis ? Describe in details the different steps of Glycolysis. 2+10
(b) State the function of Vit-C and Vit-K. 4+4
9. What is osmoregulation ? Describe the process of osmoregulation in some fresh water and marine animals. 2+9+9
10. Write notes on (any four) : 5x4
(a) Types of vertebrate eggs
(b) Function of placenta
(c) Biological species concept
(d) Polyspermy
(e) Neo-Darwinism
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