Previous Year Questions
2025
ZOOLOGY — HONOURS
Paper : DSCC-9
(Chordate Structure and Function)
Full Marks : 75
Group - A
1. Answer any ten questions :
2 × 10
(a) What is retrogressive metamorphosis? Give one example of animal where it is present.
(b) How anus is different from cloaca?
(c) State two mammalian features of Monotremata.
(d) What is meant by paedomorphosis? Give one example.
(e) Write any two distinguished features of Agnatha.
(f) Distinguish between primary and secondary gill bars.
(g) State briefly the location and function of pygostyle.
(h) What are filoplumes? Mention its occurrence.
(i) Mention two important structural differences between Ratitae and Carinatae.
(j) What is carnassial teeth? In which animal is it found?
(k) Differentiate between Urodela and Anura.
(l) What is Monimostylic jaw suspension? Name one animal where it is present.
(m) Distinguish between Ductus arteriosus and Ductus caroticus.
(n) How pronephric kidney differs from opisthonephric kidney?
(o) What is meant by acoelous centrum? Where is it found?
Group - B
2. Write short notes on (any three) :
5 × 3
(a) Accessory respiratory organs in fish
(b) Structure and derivatives of integuments in Amphibia
(c) Ruminant stomach in mammals
(d) Poison apparatus in snake
(e) Echolocation in Microchiropterans.
Group - C
Answer any four questions.
3. (a) Describe the role of endostyle in the feeding of Branchiostoma.
(b) Elaborate the role of thyroid hormones in paedomorphosis of Axolotl larva.
(c) What is bunodont teeth? Where is it found? 5+3+2
(b) Elaborate the role of thyroid hormones in paedomorphosis of Axolotl larva.
(c) What is bunodont teeth? Where is it found? 5+3+2
4. (a) Classify Amphibia up to living orders with examples.
(b) Mention the functional significance of electric organ in Torpedo.
(c) Distinguish between pectoral girdle of Pigeon and that of Guinea pig. 5+3+2
(b) Mention the functional significance of electric organ in Torpedo.
(c) Distinguish between pectoral girdle of Pigeon and that of Guinea pig. 5+3+2
5. (a) Compare the anatomy of aortic arches in reptiles and birds with diagrams.
(b) Mention the role of different muscles involved in the biting mechanism of poisonous snake.
(c) What is diastema? 5+3+2
(b) Mention the role of different muscles involved in the biting mechanism of poisonous snake.
(c) What is diastema? 5+3+2
6. (a) Briefly explain the aerodynamics of flight in birds.
(b) Distinguish between poisonous and non-poisonous snakes with suitable examples. 5+5
(b) Distinguish between poisonous and non-poisonous snakes with suitable examples. 5+5
7. (a) Describe different types of skull with reference to temporal vacuities.
(b) Draw and label the air sacs of pigeon.
(c) Add a note on olfactory apparatus in Tilapia. 3+4+3
(b) Draw and label the air sacs of pigeon.
(c) Add a note on olfactory apparatus in Tilapia. 3+4+3
8. (a) Describe in brief, the Dipleurula concept of origin of chordates.
(b) Distinguish between Chondrichthyes and Osteichthyes with suitable examples.
(c) What do you mean by venous heart? Why is it called so? 5+3+(1+1)
(b) Distinguish between Chondrichthyes and Osteichthyes with suitable examples.
(c) What do you mean by venous heart? Why is it called so? 5+3+(1+1)
9. (a) Describe the structure of cerebellum of birds.
(b) State the modifications of physoclistous type of swim bladder.
(c) State the role of notochord in Ascidian tadpole. 3+5+2
(b) State the modifications of physoclistous type of swim bladder.
(c) State the role of notochord in Ascidian tadpole. 3+5+2
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