LOYOLA COLLEGE (AUTONOMOUS), CHENNAI– 600 034

M.Sc. DEGREE EXAMINATION  –     ZOOLOGY

FIRST   SEMESTER  – NOVEMBER 2003

ZO 1801/Z  720  phylogeny of invertebrata                            

06.11.2003                                                                                        Max: 100 Marks

1.00 – 4.00

 

PART – A                                                    

Answer all the questions                                                        (2 ´ 10 =20 Marks)

1. Define parazoa and mesozoa with an example each.
2. Differentiate coelomata and pseudocoelomata.
3. What are polyclads? Mention their significance.
4. Name any two polymorphic forms of coelenterates.
5. What is the evolutionary significance of hermaphroditism?
6. Show the adaptive radiation met with Mollusca.
7. State any one theory on origin of bilateria.
8. State binomy and trinomy.
9. Mention any four types of spicules of sponges with importance.
10. Name any four minor phyla with their hallmarks.

 

  PART – B

Answer any four briefly.                                                     (4 ´ 10 = 40 Marks)

 

11. Outline the systematic position of Balanoglossus.
12. Describe a canal system with due illustration.
13. Explain any two theories of coelom formation or metamerism.
14. List the parasitic adaptations of helminthes and add a note on the evolutionary significance of parasitism.

 

15. Give an account on the origin of metazoa.
16. State the types, patterns and significance of cleavage.

   PART – C

Answer any Two questions.                                                   (2 ´ 20 = 40 Marks)

17. Evaluate the functional modification and phylogenetic significance of protozoa.
18. Discuss the evolutionary significance of echinoderm larvae.
19. Give an account of regeneration and it’s significance.
20. Illustrate the various types of corals with a note on threats posed on them and suggest methods for conservation.

 

 

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