NEPN (Sem–2) MAJ–ZOO–2:1
2026
ZOOLOGY (MAJOR)
Paper: 2:1
(Diversity of Chordates)
Full Marks: 45
Time: 2 hours
The figures in the margin indicate full marks for the questions.
1. Answer the following questions:
1×5 = 5
(a) Give two examples of Cephalochordata.
(b) Define retrogressive metamorphosis.
(c) Name the larva of Urochordata.
(d) Give two examples of cartilaginous fishes.
(e) Name any two zoogeographical realms of the world.
2. Answer any five of the following questions:
2×5 = 10
(a) Mention any three basic characters of chordates.
(b) Distinguish between Hemichordata and Cephalochordata.
(c) Mention four general characteristics of class Agnatha.
(d) Write a short note on osmoregulation in marine fishes.
(e) Write a short note on parental care in amphibians.
(f) Write a short note on the affinities of Sphenodon.
(g) What is Archaeopteryx?
(h) Write a short note on the affinities of Prototheria.
(i) What is adaptive radiation?
(j) What do you mean by a zoogeographical realm?
3. Answer any two of the following questions:
5×2 = 10
(a) Describe the general characters of Hemichordata with a suitable example.
(b) Write a note on parental care in fishes.
(c) Describe the general characteristics and classification of class Amphibia up to order.
(d) Describe the continental drift theory and its role in the distribution of animals.
4. Answer any two of the following questions:
10×2 = 20
(a) Write a note on poison apparatus and biting mechanism in snakes.
5 + 5 = 10
(b) Describe the general characters of class Pisces. Write a note on migration in fishes.
4 + 6 = 10
(c) Describe the general characters of class Aves. Write a note on the principles of aerodynamics of flight in birds.
4 + 6 = 10
(d) Write a note on Plate Tectonic Theory and Continental Drift Theory with reference to the distribution of animals.
3 + 7 = 10