W.B.C.S Main 2004 Optional Question Paper Zoology.

W.B.C.S Main 2004 Optional Question Paper Zoology paper 1

Group – A.Continue Reading W.B.C.S Main 2004 Optional Question Paper Zoology.

(Answer any three questions.)

1.  What is amoebiasis ?   Describe the morphology of three phases in the life cycle of Entamoeba histolytica.  How many metacystic trophozods are developed from a cyst of E.histolytica.     3+12+5

2.   Define torsion.  Mention the mechanism involved in the process of torsion.  Describe the torsion that is manifesed in the nervous system of Mollusca.

3.  What is retrogressive metamorphosis? Explain the phenomenon in the life history of an ascidia. State its significance.      5+12+3

4.  What is accessory respiration ?   Describe the structure and functions of the accessory respiratory organs of four fishes.  What are the adaptive and evolutionary significance of the accessory respiratory organ.      4+12+4

5.  Write short notes on any four of the following :      5×4

(a)  Retia mirabilia

(b)  Echolocation in Chiroptera

(c)  Foramen Panizza

(d)  Parthenogenesis

(e)  Alternation of generations

(f)  Aerodynamics.

Group — B

Answer any two questions

6.   How does a sanctuary differ from a National Park ?  Describe some important wild life sanctuaties and National Parks with their characteristic animal fauna. Name two endangered species of mammal and two threatened species of fish.    4+12+4

7.  What is composite fish culture ?  Describe the principle and different steps involved in the composite culture of carps.   Comment on the production and carrying capacity of the pond.     3+3+10+4

8.  Write short notes on any four of the following :     5×4

(a)  Ecological backlash

(b)  Edge effect

(c)  PAN

(d)  Biomagnification

(e)  Photoperiodism

(f)  Standard deviation.

W.B.C.S Main 2004 Optional Question Paper Zoology paper 2

Group – A

(Answer any three questions.)

1. (a) Give an account of distribution, structure and functin of different types of Lysosome.

(b) What is Cartwheel structure ?

(c) What is forming and maturing face of Golgi ?

(d) What is Zonula occludens and Zonula adherence ? 10+2+1+4=20

2. Discuss any four of the following with justification :

(a) Knelow fragment is essential for DNA repliction ?

(b) An evidence for semiconservative mode of chromosomal replication,

(c) XXY human are Klinefelter make but XXY Drosophik are female,

(d) y chromosome is genetically active in make sex dcterminatin of human,

(e) Role of Amber, Opal, Ochre in protein synthesis,

(f) he RNA is precursor of m RNA. 5×4=20

3. (a) A man belongs io A blood group while his wife has B blood group. Predict the probable genotype and phesv-type of their offspring,

(b) Define multiple allele. Prove that ABO blood group is a multiple allele,

(c) What is Bombay phenotype ?

(d) What does Rh factor stands for ? 8+2+5+3+2= 20

4. What is placenta ? Mention the types of placenta. Describe with suitable diagram the formation of placenta of rabbit. State the function of placenta. 2+4+10+4-20

5. Write notes on the following (any four) :

(i) Acrosome reaction,

(ii) Organizer concept,

(iii) Extra embryonic membrene.

(iv) Oestrous cycle,

(v) Phenetic and cladistic classification

(vi) Law of priority.

Group — B

Answer any two questions

6. Describe how nerve impulse is propagated along a nerve fibre. What is saltatory conduction ? Name the instrument by which nerve impulse can be measured. What is Spike potential ? Describe the mechanism of synaptic transmission.

7. What is Hamburger phenomenon ? Briefly explain that phenomenon which involved in CO2 transport What is sarcomere ? Illustrate the mechanism of muscle contraction. 2+10+ 2+6=20

8. Write short notes (any four) ;

(a) Osmoconformer and Osmoregutor

(b) Peptide linkage and Glycosidic linkage,

(c) Essential fatty acid and essential amino acid,

(d) Chylomicron and Micelles,

(e) Competitive and non-competitive “enzyme inhibition,

(f) Classification of Enzyme and classification of Protein. 5×4=20

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