Zoology IFS Paper 2 UPSC 2023 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 2023
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SECTION A
Zoology 1(a) Illustrate the mechanism of initiation of DNA replication and formation of primosome in prokaryotes. (IFS 2023, 8 Marks)
Zoology 1(b) Diagrammatically compare paracentric and pericentric inversions. (IFS 2023, 8 Marks)
Zoology 1(c) Distinguish between sympatric and allopatric speciation. (IFS 2023, 8 Marks)
Zoology 1(d) Explain the inheritance pattern of an autosomal recessive congenital disease showing a three-generation pedigree. (IFS 2023, 8 Marks)
Zoology 1(e) Discuss the significance of cladistics in the field of taxonomy. (IFS 2023, 8 Marks)
Zoology 2(a) Explain the use of minisatellite DNA in the process of DNA fingerprinting. (IFS 2023, 15 Marks)
Zoology 2(b) Discuss the isolating mechanisms that prevent interspecific crosses. (IFS 2023, 15 Marks)
Zoology 2(c) Describe the composition of prokaryotic ribosomes and illustrate sequential assemblies of 30S and 50S subunits during the formation of translation initiation complex. (IFS 2023, 10 Marks)
Zoology 3(a) Diagrammatically describe prophase stages and differentiate between anaphase I and II of meiotic cell division. (IFS 2023, 15 Marks)
Zoology 3(b) Describe the factors which are known to affect the Hardy-Weinberg equilibrium. (IFS 2023, 15 Marks)
Zoology 3(c) Explain the genic balance theory of sex determination in Drosophila. (IFS 2023, 10 Marks)
Zoology 4(a) Illustrate fluid mosaic model of plasma membrane and explain the mechanism of active transport through the membrane. (IFS 2023, 15 Marks)
Zoology 4(b) Distinguish between founder effect and bottleneck effect. How do these forces affect gene frequency of a large population? (IFS 2023, 10 Marks)
Zoology 4(c) Describe the role of multiple alleles in the inheritance of ABO blood group system in humans. (IFS 2023, 15 Marks)
SECTION B
Zoology 5(a) Explain the physiological role of cholesterol. (IFS 2023, 8 Marks)
Zoology 5(b) Compare the mechanism of osmoregulation in terrestrial and marine mammals with examples. (IFS 2023, 8 Marks)
Zoology 5(c) Describe the role of G protein-coupled receptors in the action of steroid hormone. (IFS 2023, 8 Marks)
Zoology 5(d) Justify the statement with examples “Coenzymes function as second substrate of concerned enzyme”. (IFS 2023, 8 Marks)
Zoology 5(e) Discuss paedogenesis and neoteny with examples. (IFS 2023, 8 Marks)
Zoology 6(a) Draw the structure of F0F1-ATP synthase and explain the chemiosmotic concept of oxidative phosphorylation. (IFS 2023, 15 Marks)
Zoology 6(b) Illustrate actin myosin sliding mechanism of muscle contraction and relaxation. (IFS 2023, 15 Marks)
Zoology 6(c) Describe different types of placenta in eutherian mammals. (IFS 2023, 10 Marks)
Zoology 7(a) Discuss the process of teratogenesis in animals. (IFS 2023, 15 Marks)
Zoology 7(b) Describe the structure of IgG and the process of generation of antibody secreting cells. (IFS 2023, 15 Marks)
Zoology 7(c) Explain the counter current mechanism operating at vasa recta and its role in urine formation. (IFS 2023, 10 Marks)
Zoology 8(a) Describe hormonal regulation of menstrual cycle. (IFS 2023, 15 Marks)
Zoology 8(b) Explain the principle and protocol of in vitro fertilization in humans. (IFS 2023, 15 Marks)
Zoology 8(c) Describe alpha helix and tertiary structure of protein. (IFS 2023, 10 Marks)