Zoology IFS Paper 1 UPSC 2023 with Solutions

Zoology Optional UPSC Forest Service Paper 1 2023

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SECTION A

1. Write a brief account on each of the following:

Zoology 1(a) Protostomes vs. Deuterostomes (IFS 2023/8 Marks)

Zoology 1(b) Skeleton in Porifera. (IFS 2023/8 Marks)

Zoology 1(c) Vision in arthropods (IFS 2023/8 Marks)

Zoology 1(d) Scales in fishes (IFS 2023/8 Marks)

Zoology 1(e) Shell diversity in mollusca (IFS 2023/8 Marks)

Zoology 2(a) What is sexual dimorphism? With the help of labelled diagrams, exhibit this in Ascaris, Give an account of the life history of Ascaris (IFS 2023/15 Marks)

Zoology 2(b) Give an account of locomotor organelles in Protozoa. Discuss various modes of locomotion in this unicellular group. (IFS 2023/15 Marks)

Zoology 2(c) What is coelom? Describe different types of coelom with the help of suitable diagrama. Draw a linear diagram to show the evolutionary relationship among different phyla based on their coelom. (IFS 2023/10 Marks)

Zoology 3(a) “Class Reptilia is divided into five subclasses on the basis of certain openings through the skull.” Substantiate this statement with the help of five well-labelled diagrams and examples. (IFS 2023/15 Marks)

Zoology 3(b) Give an elaborate account of dentition in mammals. (IFS 2023/15 Marks)

Zoology 3(c) Write an essay on 'migration in birds'. (IFS 2023/10 Marks)

Zoology 4(a) Give a comparative account of heart in vertebrates with the help of diagrams only (no description in required). (IFS 2023/15 Marks)

Zoology 4(b) Give an account of systemic position, habit, habitat and external morphology of Herdmania. Also discuss the affinities of Herdmania. (IFS 2023/15 Marks)

Zoology 4(c) Define neoteny and paedogenesis. Give an account of paedogenesis in Amphibia. (IFS 2023/10 Marks)

SECTION B

5. Write a brief account on each of the following:

Zoology 5(a) Ozone layer and its importance (IFS 2023/8 Marks)

Zoology 5(b) AIDS (IFS 2023/8 Marks)

Zoology 5(c) Student's t-test (IFS 2023/8 Marks)

Zoology 5(d) Conditioning behaviour (IFS 2023/8 Marks)

Zoology 5(e) Social behaviour in honeybees (IFS 2023/8 Marks)

Zoology 6(a) Define biological rhythm. Write an account on circadian, tidal and seasonal rhythms. (IFS 2023/15 Marks)

Zoology 6(b) What are biogeochemical cycles? Describe carbon cycle with a flow diagram. (IFS 2023/15 Marks)

Zoology 6(c) Describe the principle, working mechanism and applications of Geiger Muller counter. (IFS 2023/10 Marks)

Zoology 7(a) Write about the causative organism, pathogenecity and control measures of tuberculosis. (IFS 2023/15 Marks)

Zoology 7(b) Define pollution. Explain the sources, impacts and preventive measures of water pollution. (IFS 2023/15 Marks)

Zoology 7(c) Discuss about the nature of damage caused by and life cycle of the rice pest. Comment on its control measures. (IFS 2023/10 Marks)

Zoology 8(a) What is population dynamics and what are its controlling factors? State how population size and density are calculated. Write a note on the importance of population dynamics. (IFS 2023/15 Marks)

Zoology 8(b) What is aquaculture and its importance? Mention different phyla/groups and their candidate species used in aquaculture. Describe any two major aquaculture practices carried out in India. (IFS 2023/15 Marks)

Zoology 8(c) What are two types of variables? Explain regression analysis in this context along with biological examples. (IFS 2023/10 Marks)