Zoology Optional 2019 Paper UPSC | IFS Indian Forest Services Paper 1 and Paper 2 Questions | Previous Years Papers (PYQs)

Zoology Optional UPSC Forest Service Paper 1 2019

Paper 1 2019 SECTION A

Q.1. Answer the following questions:

(a) Write in brief about the method(s) of ingestion, digestion of food and excretion of wastes in Paramaecium. (IFS 2019/8 Marks)

(b) Define body symmetry. Give its types with examples. (IFS 2019/8 Marks)

(c) Elaborate on the structural organization of compound eye in prawn. (IFS 2019/8 Marks)

(d) Elucidate the structural diversity of shells in molluscs. Also, write their functions. (IFS 2019/8 Marks)

(e) Briefly describe types of dermal scales and their structures in fishes. (IFS 2019/8 Marks)

Q.2(a) Describe the structure of human internal ear. Also, explain the mechanism of hearing and balancing. (IFS 2019/15 Marks)

(b) How is Ascariasis caused? Describe the mode of transmission and life history of Ascarias. Give the harmful effects of Ascariasis and its control measures. (IFS 2019/15 Marks)

(c) Explain the structure and mechanism of action of nematocysts in the defense mechanism of coelenterates. (IFS 2019/10 Marks)

Q.3(a) Explain the structure of respiratory organs and write the mechanism of terrestrial and aquatic respiration in arthropods. (IFS 2019/15 Marks)

(b) Enlist the distinctive features of various subelasses of Reptilia. Also, write the differentiating characters of poisonous and non-poisonous snakes. (IFS 2019/15 Marks)

(c) Highlight various characteristics of egg-laying mammals, pouched mammals and aquatic mammals. (IFS 2019/10 Marks)

Q.4(a) Describe in detail about the structural organization of mammalian pituitary gland with emphasis on its hormones and their functions. (IFS 2019/15 Marks)

(b) Enumerate the general features and parasitic adaptations of Fasciola. (IFS 2019/15 Marks)

(c) Giving suitable examples and diagrams, describe the phenomenon of parental care in Apoda, Anura and Caudata. (IFS 2019/10 Marks)

Paper 1 2019 SECTION B

Q.5. Answer the following questions:

(a) What is greenhouse effect? How does it influence our environment? (IFS 2019/8 Marks)

(b) Explain the principle, working and applications of Geiger - Muller counter. (IFS 2019/8 Marks)

(c) Differentiate between population dispersal and population dispersion. (IFS 2019/8 Marks)

(d) Explain the various methods of lac cultivation. (IFS 2019/8 Marks)

(e) What are biological rhythms? Explain the various types of biological rhythms, citing examples. (IFS 2019/8 Marks)

6(a) Explain the biological and non-biological modes of nitrogen fixation. Also, draw the nitrogen cycle. (IFS 2019/15 Marks)

(b) Enlist the various species suitable for prawn culture. Also, describe methods of its seed production and culture techniques. (IFS 2019/15 Marks)

(c) What is correlation ? Give its types. Briefly explain the various methods of calculation of correlation between X and Y variables. (IFS 2019/10 Marks)

Q.7(a) Differentiate between primary and secondary pollutants. Describe different sources as well as management methods of gaseous pollutants. (IFS 2019/15 Marks)

(b) Citing examples, explain the different types of social groupings in primates. Also, mention the advantages of group living. (IFS 2019/15 Marks)

(c) Describe the life history and pathogenicity of Pyrilla perpusilla. note on its preventive measures. (IFS 2019/10 Marks)

Q.8(a) What is meant by AIDS? How is it transmitted? Comment on the pathology of HIV infection and its preventive measures. Add a note on its present status in India. (IFS 2019/15 Marks)

(b) Write the principle, working and applications of TEM. (IFS 2019/15 Marks)

(c) Differentiate between primary and secondary succession. Explain the various steps involved in primary community succession. (IFS 2019/10 Marks)

Zoology Optional UPSC Forest Service Paper 2 2019

Paper 2 2019 SECTION A

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

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

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

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

(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. (IAS 2019, 8 Marks)

Q.2. (a) Explain the following about plasma membrane structure: -(IAS 2019, 15 Marks)

(i) Fluidity of the membrane

(ii) Functions of the membrane proteins

(iii) Selective permeability

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

(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? (IAS 2019, 15 Marks)

Q.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. (IAS 2019, 15 Marks)

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

(i) When a colour-blind woman marries a normal man

(ii) When a carrier woman marries a normal man

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

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

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

(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. (IAS 2019, 15 Marks)

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

Paper 2 2019 SECTION B

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

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

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

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

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

Q.6.(a) Give a detailed account of oxidation of lipids. (IAS 2019, 15 Marks)

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

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

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

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

(c) Describe the process of organogenesis of vertebrate eye. (IAS 2019, 15 Marks)

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

(b) Describe the role of hormones in digestion. (IAS 2019, 10 Marks)

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