Civil Services Main Examination 2020 Zoology (Optional) Paper I


Section A

1.Write notes on the following in about 150 words each:10×5=50

(a) Gamonotogamy in Monocystis 10
(b) Skeleton in sponges 10
(c) Describe different kinds of coral reefs on the basis of their formation 10
(d) Write a note on general characters of Prototheria 10
(e) Flight adaptations in birds 10


2.(a) With the help of labelled diagrams, describe the mouth parts of house-fly, butter-fly and honey bee. 20
(b) With the help of suitable diagrams, describe the different stages of life cycle of Nereis.15
(c) With the help of labelled diagrams, give an account of the larvae found in Asteroidea, Ophiuroidea and Holothuroidea.15


3.(a) Describe the distribution, habits and habitat of Rhynchocephalia. Write a note on crocodilian and lacertilian characters of Sphenondon. 20
(b) Explain origin of Amphibia and classify Amphibia up to sub class with characters and examples.15
(c) With the help of labelled diagrams only, explain the different larval stages in the life cycle of Fasciola hepatica (No description is required).15


4.(a) Describe various accessory respiratory organs of fishes with examples. 20
(b) Describe the respiratory organs and mechanism of respiration in Unio.15
(c) Give an account of aortic arches in reptiles, birds and mammals.15


Section B


5.Write notes on the following in about 150 words each:10×5=50

(a) Division of biosphere 10
(b) Give an account of biological rhythms 10
(c) Phosphorus biogeochemical cycle 10
(d) Transgenic animals 10
(e) T E M 10


6.(a) What are the uses of Biotechnology in Forensic science? 20
(b) Describe the uses of remote sensing in sustainable development.15
(c) Explain the principle of spectrophotometer and describe its following components:

(i) Radiation sources
(ii) Phototube
(iii) Prism15


7.(a) Describe the names of any four diseases of silkworm and their causal agents (scientific names), sources of infection, symptoms and management.20
(b) Describe the characteristics of social insects with examples.15
(c) Describe chromosome painting and its versatility in modern diagnostics.15


8.(a) Describe the differences between f-test and t-test. 20
(b) Describe the principle and applications of gel electrophoresis. 15
(c) Write scientific names of any three pests of stored grains and describe the nature of damage and management of Sitophilus oryzae. 15