WEST BENGAL CIVIL SERVICE
EXAMINATION - 2004
Zoology Paper-II
Time Allowed-3 Hours Full Marks-100
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. 5x4=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. 5x4=20
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