Zoology IFS Paper 2 UPSC 2020 with Solutions
In this article, all questions of Zoology Optional Paper 2 are answered. Click on the question links to view the answers.
This article is part of Synopsis IAS Zoology Optional Course for UPSC IFS.
Zoology Optional UPSC Forest Service Paper 2 2020
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SECTION-A
Zoology 1(a) Explain the hormonal regulation of sex determination in mammals. (IFS 2020, 8 Marks)
Zoology 1(b) What is reverse transcription? Explain it with an example. (IFS 2020, 8 Marks)
Zoology 1(c) Briefly explain Neo-Darwinism. (IFS 2020, 8 Marks)
Zoology 1(d) “Lysosomes are the suicidal bags of the cell.” Justify. (IFS 2020, 8 Marks)
Zoology 1(e) Define Cladistics. Comment on its significance. (IFS 2020, 8 Marks)
Zoology 2(a) Define Mutation. Explain various physical and chemical mutagens with suitable examples. (IFS 2020, 15 Marks)
Zoology 2(b) Give an illustrated account of the evolutionary history of horse. (IFS 2020, 15 Marks)
Zoology 2(c) Briefly describe the modern methods of taxonomy for animals. (IFS 2020, 10 Marks)
Zoology 3(a) Explain the transport of large molecules across the plasma membrane. (IFS 2020, 15 Marks)
Zoology 3(b) What are Transposons? Explain the general structure and mechanism of transposition of Tn3 elements in prokaryotes. (IFS 2020, 15 Marks)
Zoology 3(c) Differentiate between Parapatric and Sympatric speciation. (IFS 2020, 10 Marks)
Zoology 4(a) Describe with well-labelled diagram, the stages involved in Meiotic prophase. (IFS 2020, 15 Marks)
Zoology 4(b) Write an account of the methods of determination of the age of fossils. (IFS 2020, 15 Marks)
Zoology 4(c) Give an account of the molecular mechanism of crossing over. (IFS 2020, 10 Marks)
SECTION B
Zoology 5(a) Describe the role of cholesterol in steroidogenesis. (IFS 2020, 8 Marks)
Zoology 5(b) Explain how animals can survive in varying salinities. (IFS 2020, 8 Marks)
Zoology 5(c) Briefly describe the sliding filament theory of muscle contraction. (IFS 2020, 8 Marks)
Zoology 5(d) Illustrate the fate map of frog during gastrulation. (IFS 2020, 8 Marks)
Zoology 5(e) Differentiate between primary and secondary immune response. (IFS 2020, 8 Marks)
Zoology 6(a) Give a diagrammatic representation of citric acid cycle and discuss its role in metabolism. (IFS 2020, 15 Marks)
Zoology 6(b) Describe the process of synthesis, secretion, and action of acetylcholine during synaptic transmission. (IFS 2020, 15 Marks)
Zoology 6(c) Give a brief account of hormonal regulation of metamorphosis in insects. (IFS 2020, 10 Marks)
Zoology 7(a) Discuss the laws of thermodynamics and their applications in biological systems. (IFS 2020, 15 Marks)
Zoology 7(b) Define Apoptosis. Explain its mechanism with suitable example. (IFS 2020, 15 Marks)
Zoology 7(c) Discuss the structure of inner ear and explain its mechanism in hearing. (IFS 2020, 10 Marks)
Zoology 8(a) Give an account of the genetic basis of axis specification with one suitable example. (IFS 2020, 15 Marks)
Zoology 8(b) What is blood coagulation? Enumerate the various steps involved in blood coagulation. (IFS 2020, 15 Marks)
Zoology 8(c) Define Teratogen. Briefly explain the different teratogenic agents. (IFS 2020, 10 Marks)