IFS-2000: Zoology
Paper-I
Section A

1 Write briefly on any four of the following in not more than 150 words each

The concept of species and its significance in classification

Metamerism in Neries

Retrogressive metamorphosis

Poison apparatus of snakes and mechanism of biting

Anatomical peculiarities and affinities of Apoda

2 Answer the following questions

Illustrate the structure of an ommatidium and explain the mechanism of image formation in insects

With suitable examples describe the parasitic adaptations in helminths

3 Answer the following questions

Describe the general organisation of Echinodermata and comment on its affinities

Give a brief account of migration in birds

4 With suitable diagrams and examples describe the dentition in mammals. Comment on its relationship with their feeding habits

Section B

5 Write notes on any four of the following in not more than 150 words each:

Characteristics of population

Sources, effects and fate of air pollutants

Parasitic protozoans

Methods and significance of induced breeding in fish

Periplaneta americana as a household pest and its control measures

6 Evaluate critically the present status of wildlife conservation in India. Suggest suitable corrective measures, if required

7 Answer the following questions

With suitable examples explain the role of pheromones in insect behaviour

Giving appropriate examples describe the different measures of central tendency

8 Answer the following questions

Discuss briefly the role of water as an abiotic factor

Present a brief review of the fundamental concepts related to energy flow in the environment