Zoology IFS Paper 2 UPSC 2019 with Solutions

Zoology Optional UPSC Forest Service Paper 2 2019

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SCTION-A

Zoology 1(a) Describe the structure of the mitotic spindle and the role of different types of fibres in chromosome movement. (IFS 2019, 8 Marks)

Zoology 1(b) What are the salient features of the genetic code? Write the nonsense codons and their theoretical anticodons. (IFS 2019, 8 Marks)

Zoology 1(c) Write the Urey and Miller experiment relating to the origin of life on the earth. (IFS 2019, 8 Marks)

Zoology 1(d) Give the salient features of International Code of Zoological Nomenclature. (IFS 2019, 8 Marks)

Zoology 1(e) Describe the genetics of ABO human blood groups. Can a man of blood group B be the father of the child of a woman of blood group A? The blood group of the child is O. Explain the genotypes. (IFS 2019, 8 Marks)

Zoology 2(a) Explain the following about plasma membrane structure: (IFS 2019, 15 Marks)

Zoology 2a (i) Fluidity of the membrane. 

Zoology 2a (ii) Functions of the membrane proteins. 

Zoology 2a (iii) Selective permeability. 

Zoology 2(b) How does sex determination take place in Drosophila? Add a note on genic balance theory. (IFS 2019, 10 Marks)

Zoology 2(c) Explain the Hardy-Weinberg law of genetic equilibrium and give its algebraic expression. At a locus with a dominant and a  recessive allele in Hardy-Weinberg equilibrium, 16% of the individuals are homozygous for the recessive allele. What is the frequency of the dominant allele in the population? (IFS 2019, 15 Marks)

Zoology 3(a) Explain with the help of diagrams, how the transport of electrons through the four complexes of the respiratory chain in mitochondria leads to the formation of a proton gradient and ATP synthesis. (IFS 2019, 15 Marks)

Zoology 3(b) What phenotypic ratio do you expect from the following crosses with reference to colour blindness in human beings? (IFS 2019, 15 Marks)

Zoology 3b (i) When a colour-blind woman marries a normal man. 

Zoology 3b (ii) When a carrier woman marries a normal man.

Zoology 3b (iii) When a normal woman marries a colour-blind man.

Zoology 3(c) Explain continental drift and write the evidences in its support. (IFS 2019, 10 Marks)

Zoology 4(a) Explain the role of transcription factors of RNA polymerase II in eukaryotes. (IFS 2019, 10 Marks)

Zoology 4(b) In a Mendelian cross, a round yellow pea plant (RRYY) was crossed to a wrinkled green pea plant (rryy). What will be the F1 and F2 offsprings? Give their genotypic and phenotypic ratios. (IFS 2019, 15 Marks)

Zoology 4(c) Describe the palaeontological evidences in favour of evolution of man. (IFS 2019, 15 Marks)

SECTION B

Zoology 5(a) What are the different types of coenzymes? Explain the action of anyone. (IFS 2019, 8 Marks)

Zoology 5(b) Describe chloride shift with reference to carbon dioxide transport. (IFS 2019, 8 Marks)

Zoology 5(c) Describe aging process and explain the physiological basis of aging. (IFS 2019, 8 Marks)

Zoology 5(d) Explain the role of ADH and juxtaglomerular complex in the regulation of kidney function. (IFS 2019, 8 Marks)

Zoology 5(e) Describe the differences between α-helix and β-pleated sheet protein structures. (IFS 2019, 8 Marks)

Zoology 6(a) Give a detailed account of oxidation of lipids. (IFS 2019, 15 Marks)

Zoology 6(b) What is binocular vision? Write the role of rods and cones in physiology of vision. (IFS 2019, 15 Marks)

Zoology 6(c) Describe in vitro fertilization and add a note on embryo transfer techniques. (IFS 2019, 10 Marks)

Zoology 7(a) Explain the mechanism of peptide hormone action on a liver cell. (IFS 2019, 15 Marks)

Zoology 7(b) Explain how action potential is generated and propagated in the nerve fibre. (IFS 2019, 10 Marks)

Zoology 7(c) Describe the process of organogenesis of vertebrate eye. (IFS 2019, 15 Marks)

Zoology 8(a) Draw the structures of different types of immunoglobulins. Which type of immunoglobulin production is stimulated in case of allergic reactions? (IFS 2019, 15 Marks)

Zoology 8(b) Describe the role of hormones in digestion. (IFS 2019, 10 Marks)

Zoology 8(c) Describe the morphological and histological types of placenta in mammals. Explain the role of HCG in human beings. (IFS 2019, 15 Marks)