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7th December 2014, 10:50 AM
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Join Date: Apr 2013
Re: WBCS question papers for Zoology

Here is the WBCS question papers for Zoology which you are looking for

Time Allowed-3 Hours Full Marks-100


Group - A

(Answer any three questions.)


1. (a) Describe the ultra structures of Golgi bodies. 8

(b) Write briefly how Golgi bodies are formed. 4

(c) Enumerate principal functions of the Golgi bodies. 5

(d) Name three enzymes found in outer membrane, inner membrane and the matrix of mitochondria. Comment on their functions. 3



2. (a) Name and describe the molecular changes exhibited by ejaculated sperms favouring fertilization. 8

(b) Give diagram and explain the structure of zona proteins. 5

(c) Write short notes on :

(i) Role qf yolk in cleavage 31/2

(ii) Ultra structure of sperm 31/2



3. (a) Explain with a diagram the nucleosome model. 6

(b) How from Klinefelter and Turner karyotypes and their corresponding sexual phenotypes, you may conclude that Y chromosome determines maleness in human ? 4

(c) What is specialised transduction ? Explain with example. 5

(d) State the role of RNA polymerase-II in transcription. 5



4. Write notes on any five :

(a) Southern blot technique

(b) ‘C value paradox

(c) X ist gene

(d) YAC

(e) Sex-influenced traits

(f) Shine-Dalgarno Sequence

(g) Okazaki fragments. 4x5



5. (a) Explain Hardy-Weinburg equilibrium. 2

(b) Cystic fibrosis is an autosomal recessive disorder, in certain population in North Europe, this disorder show an incidence of 1/2500. What proportion of individuals in this population are carriers for this disease ? Justify your calculations. 6

(c) What do you mean by “stabilizing selection” and “directional selection” ? 4

(d) Point out the phyletic gradualistic trends in the equine evolution. 8



Group-B

Answer any two questions.


6. Write notes on any five :

(a) Zoological nomenclature

(b) Lectotype and syntype

(c) ‘OTU‘

(d) \alpha, \beta, \gamma-taxonomy

(e) Category

(f) Cryptic species

(g) Biological species concept. 4x5



7. (a) What is “All-or-Nothing” principle ? 2

(b) Explain all the factors that determine the resting membrane potential of nerve fibres. 4

(c) What are the successive stages of the action potential which we find in a nerve fibre, during transmission of signals ? Explain with diagram. 8

(d) What is gluconeogenesis ? Schematically describe this pathway. 6



8. (a) Discuss briefly the primary, secondary, tertiary and quarternary structure of protein. 8

(b) What is allosteric modulation. 2

(c) What do you know about competitive, noncompetitive and uncompetitive inhibition of enzyme ? 6

(d) What is xerophthalmia and beriberi. 4


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