W.B.C.S Main 2008 Optional Question Paper Zoology.

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W.B.C.S Main 2008 Optional Question Paper Zoology Paper 1

Group – A.Continue Reading W.B.C.S Main 2008 Optional Question Paper Zoology.

(Answer any three questions.)

1.  Define metamorphosis and retrogressive metamorphosis।  Explain the retrogressive and progressive changes in the life cycle of Ascidia.  Give an example of non-chordate having retrogression in adult.     (2+2)+(7+7)+2

2.  Mention the course of water circulation in the canal system of Sycon. Name the various cells found in sponges. Write a note on the spicules in sponges with suitable diagrams.     5+5+10

3.  Explain the comparative anatomy of kindney of fish, amphibia, reptilia and mammals. Add a note on the fate of ducts of the urogenital system in the course of evolution।      4×4+4

4.  Elucidate the changes of nuclei in Paramoecium in the course of typical conjugation. Write on the significance of conjugation. Discuss on the detailed structure of cilia or flagella.    10+4+6

5.  Write short notes on any four:     5×4

a.  Swim bladder

b.  Echolocation

c.  Torsion

d.  Cercaria

e.  Polian vesicles

f.  Mouth parts of Periplaneta.

Group – B

Answer any two

6.  a.  Explain the concept of fixed action pattern with suitable examples in terms of behaviour.    10

b. Define biological clock. Explain circadian clock with example. 2+8

7.  Define gross and net productivity. Explain the factors influencing productivity. Explain energy flow with a suitable model.    2+2+8+8

8.  Write scientific name of two pearl producing mollusks. Write the composition of pearl. How pearls are formed ?  Explain the technique of pearl culture.    2+3+5+10

9.    Define probability. Write on one-tail test and two-tail test. State the general properties of normal distribution.    4+8+8

W.B.C.S Main 2008 Optional Question Paper Zoology paper 2

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.          4×5

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)  αα, ββ, γγ-taxonomy

(e)  Category

(f)  Cryptic species

(g)  Biological species concept.     4×5

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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