LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

           B.Sc. DEGREE EXAMINATION – ADVANCED ZOOLOGY & BIOTECH.

DE 9

FOURTH SEMESTER – APRIL 2008

AZ 4500/ ZO 4500 – EMBRYOLOGY & EVOLUTION

 

 

 

Date : 26-04-08                  Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

PART – A

 

Answer ALL questions                                                                                  (10 X 2 = 20 marks)

 

1. Define Spermiogenesis.
2. What is Amphimixis?
3. Write about delamination.
4. Comment on Somatopleure.
5. What are fate maps?
6. Describe Batesian mimicry.
7. Define ethological isolation.
8. Differentiate phyletic and true speciation.
9. Give an account on petrifaction.
10. Write about Mesozoic era.

PART – B

 

Answer any FOUR questions                                                                  (4 x 10 = 40 marks)

 

1. Describe any two important theories of fertilization.
2. Explain briefly spemann’s experiments on organizer.
3. Write about the different types of placenta.
4. Comment on Neo – Lamarckism.
5. Give an account on post – zygotic isolation.
6. Describe the nature of fossils.

PART – C

 

Answer any TWO questions                                                                    (2 x 20 = 40 marks)

 

1. Trace out the embryonic development of heart of frog.
2. What are foetal membranes?  Describe the origin, structure and functions of them.
3. Explain the theory of Natural selection.
4. Trace evidences from biochemistry and physiology in favour of the theory of organic evolution.

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