LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
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M.Sc. DEGREE EXAMINATION – ZOOLOGY
FIRST SEMESTER – APRIL 2007
ZO 1807 – PHYLOGENY OF INVERT.& CHORDATA
Date & Time: 25/04/2007 / 1:00 – 4:00 Dept. No. Max. : 100 Marks
Part-A
Answer ALL. (10×2=20 marks)
- Give the dental formulae of the following animals.
- Rat b. Elephant
- Write the zoological names of the following animals.
- Lion b. Pigeon c. Peacock d. Squirrel
- Explain the piercing and sucking type of mouth parts with an example.
- Define.
- Blind Spot b. Ductus caroticus
- Write short notes on any one echinoderm larva.
- Write any two affinities of Rotifera towards lower invertebrates.
- Give any two economic importance of invertebrates.
- Distinguish heterocercal and reversed heterocercal caudal fins
- Define the following
- Metamerism b. Polymorphism
- Write the disease caused by the following.
- Plasmodium b. Taenia
Part-B
Answer any FIVE. (5×8=40 marks)
- Give a comparative account of the respiratory system in vertebrates
- Give an account on the larval forms of crustacea.
- Explain the organ and organ systems of the minor phylum rotifera highlighting its
phylogeny.
- Classify the gnathostomes.
- Write a note on sericulture.
- Discuss in detail the phylum hemichordata bringing in its affinities.
Part-C
Answer any TWO. (2×20=40 marks)
- a. What are jawless vertebrates?
- Classify the class ostracoderms
- Discuss in detail the phylogeny of ostracoderms
- a. What is ponsvaroli?
- Mention the ventricles of brain
- Bring out a comparative account of the brain of invertebrates and chordates
- Give a detailed account of the following highlighting their phylogeny.
- Brachiopoda
- Chaetognatha
- Write an essay on the invertebrate parasites and their impact on human elaborating their life cycle.
- a. What is a geological time scale?
- Chart out the distribution of invertebrates and chordates