RAMAKRISHNA MISSION VIDYAMANDIRA
(Residential Autonomous College affiliated to University of Calcutta)
Date : 19/03/2016
Time : 12 noon – 1 pm
FIRST YEAR (BATCH 2015-18)
B.A./B.Sc. SECOND SEMESTER (January – June) 2016
Mid-Semester Examination, March 2016
ZOOLOGY (General)
Paper : II
Full Marks : 25
[Use a separate Answer Book for each group]
Group – A
1) Answer any five questions of the following:
(5 × 1)
a) Scoliodon & Sphyrna belong to the subclass _______________.
b) In cartilaginous fishes, epidermis is covered by closely set __________ scales.
c) Site a living example form the Infraclass Teleosti.
d) Write two major characteristic features of the order Urodela.
e) What is the basic difference between anapsid and diapsid skulls?
f)
Plastron is found in the order _____________.
g) In which group can we find the Organ of Jacobson?
h) In reptiles, kidney is of ______________ type generally.
2) Answer any two questions of the following:
(2 × 5)
a) Why does water flow to the opposite direction of the blood flow in gill filaments? What are
the major functions of retia mirabilia? “In fishes, swim-bladder is a vital aquatic adaptation”
– justify.
(1+1+3)
b) Explain briefly why respiration in birds is considered as a double respiration.
c) Write major differences between mesonephric and opisthonephric kidneys.
d) Illustrate the importance of air sacs in an avian body.
Group – B
3) Answer any five questions of the following:
(5 × 1)
a) What is Oogenesis?
b) State the difference between spermatogenesis & spermiogenesis.
c) Mention the significance of primitive streak.
d) What is gray crescent?
e) Distinguish between centrolecithal and alecithal eggs.
f)
Which extra-embryonic membranes develop on the first-day chick?
4) Answer any one question of the following:
a) Describe the role of yolk in cleavage.
b) Briefly enumerate the fertilization event in Sea Urchin with a suitable diagram.
c) Briefly describe the day sequence of gastrulation in chick embryo.
———— × ————
(1 × 5)