Zoology IFS Paper 2 UPSC 2021 with Solutions

Zoology Optional UPSC Forest Service Paper 2 2021

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SECTION-B

Zoology 1(a) Briefly explain the contributions of George Gamow, Har Gobind Khorana, Marshall Nirenberg and Severo Ochoa in deciphering the genetic code. (IFS 2021, 8 Marks)

Zoology 1(b) How do proteins move through the Golgi apparatus? Explain. (IFS 2021, 8 Marks)

Zoology 1(c) Explain synonymy and homonymy in context of the International Code of Zoological Nomenclature. (IFS 2021, 8 Marks)

Zoology 1(d) Briefly discuss the role of geographical and reproductive isolations in speciation. (IFS 2021, 8 Marks)

Zoology 1(e) Describe different types of intercellular junctions in animal cells. (IFS 2021, 8 Marks)

Zoology 2(a) Explain molecular mechanism of chromosome movements in eukaryotes. (IFS 2021, 15 Marks)

Zoology 2(b) What is an Operon? Explain how a polycistronic structural gene is regulated by a common promoter and a combination of regulatory genes in a lac-operon. (IFS 2021, 15 Marks)

Zoology 2(c) Give an account of ancestry of Miocene and Pliocene proboscideans. (IFS 2021, 10 Marks)

Zoology 3(a) Define Linkage. Give an illustrated account of complete, incomplete and sex linkages. (IFS 2021, 15 Marks)

Zoology 3(b)  How does continental drift theory explain the discontinuous and restricted distribution of organisms ? (IFS 2021, 15 Marks)

Zoology 3(c) Explain the phenomenon of endocytosis in organisms with suitable examples. (IFS 2021, 10 Marks)

Zoology 4(a) Describe the principle, procedure and applications of DNA fingerprinting. (IFS 2021, 15 Marks)

Zoology 4(b) Define Mimicry. Enlist its causes. Explain different types of mimicry with suitable examples. (IFS 2021, 15 Marks)

Zoology 4(c) Give the structure and functions of nuclear envelope. (IFS 2021, 10 Marks)

SECTION B

Zoology 5(a) Explain quaternary structure of haemoglobin. (IFS 2021, 8 Marks)

Zoology 5(b) What is Bohr’s effect? How does it promote gaseous exchange in the lungs and the tissues? (IFS 2021, 8 Marks)

Zoology 5(c) What are oligosaccharides? Give structural formulae and functions of biologically important maltose, sucrose and lactose. (IFS 2021, 8 Marks)

Zoology 5(d) Explain morphogenetic movements in gastrulation of frog. (IFS 2021, 8 Marks)

Zoology 5(e) Briefly write about hormonal control of digestive secretions in humans. (IFS 2021, 8 Marks)

Zoology 6(a) Describe structural differences among glycogen, starch and cellulose and elaborate their functions. (IFS 2021, 15 Marks)

Zoology 6(b) Explain countercurrent mechanism of urine concentration in the kidneys of higher vertebrates. (IFS 2021, 15 Marks)

Zoology 6(c) What is invasive placenta? Discuss its types, causes and risk factors. (IFS 2021, 10 Marks)

Zoology 7a) Give schematic representation of electron transport chain. Describe the energy coupling mechanism in oxidative phosphorylation using chemiosmotic model. (IFS 2021, 15 Marks)

Zoology 7(b) Enumerate different blood coagulation factors. Explain their role in the process of blood coagulation. (IFS 2021, 15 Marks)

Zoology 7(c) Classify Vitamins. Discuss deficiency symptoms of fat-soluble vitamins. (IFS 2021, 10 Marks)

Zoology 8(a) Why do cells die? Discuss apoptosis, necrosis and autophagy. Add a note on “cell death proteins”. (IFS 2021, 15 Marks)

Zoology 8(b) Explain hormonal regulation of menstrual cycle in women. (IFS 2021, 15 Marks)

Zoology 8(c) Describe the structure and functions of neutral fats. (IFS 2021, 10 Marks)