LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – ZOOLOGY

TS 8

FOURTH SEMESTER – APRIL 2006

                                              ZO 4500 – EMBRYOLOGY AND EVOLUTION

(Also equivalent to ZOO 506)

 

 

Date & Time : 25-04-2006/9.00-12.00         Dept. No.                                                       Max. : 100 Marks

Part A                                     (Answer All)                          10 ´ 2 = 20

1. Comment on thelytoky.
2. Define vitellogenesis
3. Differentiate epiboly from emboly.
4. What do you mean by otocyst?
5. Comment on primordial germ cells.
6. Differentiate organic evolution from inorganic evolution.
7. With one suitable example explain Batesian mimicry.
8. What are living fossils?
9. Bring out the biological significance of Mesozoic era.
10. Define Biogenetic law.

 

Part B                                     (Answer any four)                 4 ´ 10 = 40

 

11. Describe spermatogenesis.
12. Briefly explain development in sponges.
13. What is a fate map? Explain the same with an example.
14. Write notes on animal colouration.
15. Categorise modes of speciation.
16. Write notes on : (1) Biochemical recapitulation (2) Biochemical metamorphosis.

 

Part C                                     (Answer any two)                              2 ´ 20 = 40

 

17. Write an essay on fertilization and add a note on theories of fertilization.
18. Trace the development of eye in a vertebrate.
19. Categorise mutations and explain their role in evolution.
20. Assess the nature and significance of available fossil records.

 

 

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