LOYOLA  COLLEGE (AUTONOMOUS), CHENNAI-600 034.

B.Sc. DEGREE  EXAMINATION  – ZOOLOGY

SECOND  SEMESTER  – APRIL 2003

ZO 2500/ ZOO 502 – CHORDATA

23.04.2003

9.00 -12.00                                                                                       Max : 100 Marks

 

 

PART – A                                       (10 ´ 2 = 20 Marks)

 

1. Answer ALL the following questions.

 

1. Give the outline classification of class Reptilia.
2. Draw a neat labelled pectoral girdle of varanus.
3. What is a wheel organ?
4. Comment on placoid scale.
5. List four flightless birds.
6. Give the dental formula of dog and man.
7. What is a synsacrum?
8. What are accessory respiratory organs? Give two examples.
9. Comment on Hippocampus.
10. Give the modifications of Draco volans.

 

PART – B                                        (4 ´ 10 = 40 Marks)

II   Answer any FOUR of the following.

 

11. Explain the arterial system of shark.
12. Briefly explain jaw suspensions.
13. What is retrogressive metamorphosis? Explain with reference to Ascidia.
14. Illustrate the male and female urinogenital systems of Calotes.
15. Describe the venous system of rat.
16. Briefly explain the different types of respiration in frog.

 

 

PART – C                                       (2 ´ 20 = 40 Marks)

III  Answer any TWO of the following

 

17. Explain the organisation and affinities of Amphioxus.
18. Write an essay on migration of birds.
19. Parental care is exhibited by amphibians –
20. a) Give the key to identification of poisonous and non poisonous snakes?

b)Give an account on snakevenom and biting mechanism.

 

 

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