Zoology Optional 2020 Paper UPSC | IFS Indian Forest Services Paper 1 and Paper 2 Questions | Previous Years Papers (PYQs)

Zoology Optional UPSC Forest Service Paper 1 2020

Paper 1 2020 SECTION A

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

1(a) Salient features of Rotifera with suitable examples (IFS 2020/8 Marks)

1(b) Parasitic adaptations of Fasciola (IFS 2020/8 Marks)

1(c) Feeding mechanisms of Mollusca (IFS 2020/8 Marks)

1(d) Skull types of Squamata (IFS 2020/8 Marks)

1(e) Air-breathing fishes (IFS 2020/8 Marks)

2(a) What are Great Barrier Reefs? Describe how climate change influences coral reef formation. (IFS 2020/15 Marks)

2(b) Write an account on recent system of animal classification. Outline its differences from earlier empirical approach(es). (IFS 2020/15 Marks)

2(c) Describe the life cycle of Nereis. (IFS 2020/10 Marks)

3(a) Write an account on modification of mouthparts in Insecta. Give suitable examples and diagrams. (IFS 2020/15 Marks)

3(b) Discuss that Sphenodon is the most primitive and Crocodile is the most advanced of all living reptilians. (IFS 2020/15 Marks)

3(c) Polychaetes exhibit different modes of life adapted to different habitats. Elaborate. (IFS 2020/10 Marks)

4(a) Enumerate the functions and main components of endoskeleton of vertebraten. Give an account on the types of jaw suspensoria with suitable diagrams. (IFS 2020/15 Marks)

4(b) Describe the structural organization of thyroid and parathyroid glands in different vertebrate groups with a note on the hormone-producing cells and hormones. (IFS 2020/15 Marks)

4(c) Herdmania is primitive and degenerate descendant of ancestral chordates. Discuss (IFS 2020/10 Marks)

Paper 1 2020 SECTION B

5. Differentiate between the following:

5(a) Biomes and Ecotones (IFS 2020/8 Marks)

5(b) Ecto and Endo-parasites of cattle (IFS 2020/8 Marks)

5(c) Pyrilla and Achaea pests (IFS 2020/8 Marks)

5(d) Spectrophotometry and Flame photometry (IFS 2020/8 Marks)

5(e) Polyculture and Integrated fish farming (IFS 2020/8 Marks)

6(a) What is ecological succession? Explain the causes and theories of ecological succession. (IFS 2020/15 Marks)

6(b) Define apiculture. Explain the methodology, status and scope of apiculture in India. (IFS 2020/15 Marks)

6(c) Describe the principle and application of ANOVA. (IFS 2020/10 Marks)

7(a) With suitable examples, explain different methods of studying animal behaviour. (IFS 2020/15 Marks)

(b) Primates exhibit a system of social hierarchy. Explain it in the context of territoriality and dominance. (IFS 2020/15 Marks)

7(c) Write about the pathogenicity of cholera with a note on control measures. (IFS 2020/10 Marks)

8(a) Explain the importance of fisheries in India. Write about the conservation strategies of finfish and shellfish. (IFS 2020/15 Marks)

8(b) Describe the role of hormones in prey-predator detection and predator tactics. (IFS 2020/15 Marks)

8(c) Define population. Explain the characteristics of a population. (IFS 2020/10 Marks)

Zoology Optional UPSC Forest Service Paper 2 2020

Paper 2 2020 SECTION A

Q1. (a) Explain the hormonal regulation of sex determination in mammals. (IFS 2020, 8 Marks)

(b) What is reverse transcription? Explain it with an example. (IFS 2020, 8 Marks)

(c) Briefly explain Neo-Darwinism. (IFS 2020, 8 Marks)

(d) “Lysosomes are the suicidal bags of the cell.” Justify. (IFS 2020, 8 Marks)

(e) Define Cladistics. Comment on its significance. (IFS 2020, 8 Marks)

Q2. (a) Define Mutation. Explain various physical and chemical mutagens with suitable examples. (IFS 2020, 15 Marks)

(b) Give an illustrated account of the evolutionary history of horse. (IFS 2020, 15 Marks)

(c) Briefly describe the modern methods of taxonomy for animals. (IFS 2020, 10 Marks)

Q3. (a) Explain the transport of large molecules across the plasma membrane. (IFS 2020, 15 Marks)

(b) What are Transposons? Explain the general structure and mechanism of transposition of Tn3 elements in prokaryotes. (IFS 2020, 15 Marks)

(c) Differentiate between Parapatric and Sympatric speciation. (IFS 2020, 10 Marks)

Q4. (a) Describe with well-labelled diagram, the stages involved in Meiotic prophase. (IFS 2020, 15 Marks)

(b) Write an account of the methods of determination of the age of fossils. (IFS 2020, 15 Marks)

(c) Give an account of the molecular mechanism of crossing over. (IFS 2020, 10 Marks)

Paper 2 2020 SECTION B

Q5. (a) Describe the role of cholesterol in steroidogenesis. (IFS 2020, 8 Marks)

(b) Explain how animals can survive in varying salinities. (IFS 2020, 8 Marks)

(c) Briefly describe the sliding filament theory of muscle contraction. (IFS 2020, 8 Marks)

(d) Illustrate the fate map of frog during gastrulation. (IFS 2020, 8 Marks)

(e) Differentiate between primary and secondary immune response. (IFS 2020, 8 Marks)

Q6. (a) Give a diagrammatic representation of citric acid cycle and discuss its role in metabolism. (IFS 2020, 15 Marks)

(b) Describe the process of synthesis, secretion, and action of acetylcholine during synaptic transmission. (IFS 2020, 15 Marks)

(c) Give a brief account of hormonal regulation of metamorphosis in insects. (IFS 2020, 10 Marks)

Q7. (a) Discuss the laws of thermodynamics and their applications in biological systems. (IFS 2020, 15 Marks)

(b) Define Apoptosis. Explain its mechanism with suitable example. (IFS 2020, 15 Marks)

(c) Discuss the structure of inner ear and explain its mechanism in hearing. (IFS 2020, 10 Marks)

Q8. (a) Give an account of the genetic basis of axis specification with one suitable example. (IFS 2020, 15 Marks)

(b) What is blood coagulation? Enumerate the various steps involved in blood coagulation. (IFS 2020, 15 Marks)

(c) Define Teratogen. Briefly explain the different teratogenic agents. (IFS 2020, 10 Marks)