Zoology Optional 2018 Paper UPSC | IFS Indian Forest Services Paper 1 and Paper 2 Questions | Previous Years Papers (PYQs)

Zoology Optional UPSC Forest Service Paper 1 2018

Paper 1 2018 SECTION A

Q1. Write a brief account of the following:                                

(a) Sol-gel hypothesis of protozoan locomotion (IFS 2018, 8 Marks)

(b)  Spicules in Porifera (IFS 2018, 8 Marks)

(c) Parasitic mode adaptations in nematodes    (IFS 2018, 8 Marks)

(d) Ciliary mode of feeding in Branchiostoma (IFS 2018, 8 Marks)

(e) Phenomenon of Paedomorphosis in Amphibia (IFS 2018, 8 Marks)

Q2. (a)  Schematically present the process of conjugation in Paramoecium sp. Comment on its biological significance. (IFS 2018, 15 Marks)

(b) Define metagenesis. Elaborate the process of metagenesis in Obelia with suitable diagram. (IFS 2018, 15 Marks)

(c) Sphenodon is considered to be a living fossil — Justify. (IFS 2018, 10 Marks)

Q3. (a) Explain the neuro-endocrine regulation of insect metamorphosis with suitable illustrations. Comment on the role of JH (Juvenile Hormone) in insect metamorphosis. (IFS 2018, 15 Marks)

(b) Give an account of accessory respiratory structures in fishes with a note on their biological significance. (IFS 2018, 15 Marks)

(c) What is emergency hormone? How is the secretion of this hormone being regulated? (IFS 2018, 10 Marks)

Q4. (a) Give a comparative account of aortic arches in different Vertebrates with suitable illustrations. (IFS 2018, 15 Marks)

(b)  Peripatus is a living connecting link between Annelida and Arthropoda. Explain. (IFS 2018, 15 Marks)

(c) Give the scientific name of one amphibious mollusc. How does it respire in aquatic medium? (IFS 2018, 10 Marks)

Paper 1 2018 SECTION B

Q5.(a) Differentiate between culture and capture fisheries. (IFS 2018, 8 Marks)

(b) Comment on the prospects of Sericulture in India. (IFS 2018, 8 Marks)

(c) Write a brief note on Climax Community. (IFS 2018, 8 Marks)

(d) Distinguish between hormone and pheromone with a note on alarm hormone. (IFS 2018, 8 Marks)

(e) Write a brief note on the principle and applications of a spectrophotometer. (IFS 2018, 8 Marks)

Q6. (a) Give an account on the forest types of India. Why do tropical rainforests support a large number of life forms? (IFS 2018, 15 Marks)

(b) What is population growth? Delineate different factors affecting population growth. Distinguish between “J” shaped and “S” shaped growth curve with examples. (IFS 2018, 15 Marks)

(c) Mention the aims and objectives of “Project Tiger”. Comment on its limitations. (IFS 2018, 10 Marks)

Q7. (a) Why do birds migrate? Give an account of different methods of navigation during bird migration. (IFS 2018, 15 Marks)

(b) Briefly narrate different techniques of courtship display among birds. (IFS 2018, 15 Marks)

(c) Give an account on the echolocation in bats. (IFS 2018, 10 Marks)

Q8. (a) Mention the nature of damage caused by Pyrilla sp. to sugarcane. Describe the lifecycle stages of the said pest with proper diagram. Suggest measures to control the pest. (IFS 2018, 15 Marks)

(b) Name important malaria vectors of India. Elaborate the life cycle of any malaria vector of India. How can the transmission of malaria be checked? (IFS 2018, 15 Marks)

(c) | What is null hypothesis? Elaborate the application of chi square test in biology. (IFS 2018, 10 Marks)

Zoology Optional UPSC Forest Service Paper 2 2018

Paper 2 2018 SECTION A

Q1. (a) Explain the role of endoplasmic reticulum in lipid biosynthesis. (IFS 2018, 8 Marks)

(b) Explain the types of transposons with a note on any two transposition events. (IFS 2018, 8 Marks)

(c) Describe the different types of vectors. (IFS 2018, 8 Marks)

(d) Explain how mimicry helps animals to lead a successful life. (IFS 2018, 8 Marks)

(e) Discuss the various types of zoological nomenclature with suitable examples. (IFS 2018, 8 Marks)

Q2. (a) Discuss the application of pedigree analysis in identifying diseases. (IFS 2018, 15 Marks)

(b) What are lysosomes? Discuss their role in intracellular digestion. Give an example of lysosomal storage disorder. (IFS 2018, 15 Marks)

(c) Describe the steps involved in gene regulation in eukaryotes. (IFS 2018, 10 Marks)

Q3. (a) With a neatly labelled diagram, explain sodium-potassium pump and its role in membrane transport. (IFS 2018, 10 Marks)

(b) Explain the mode of speciation in evolution with examples. (IFS 2018, 15 Marks)

(c) Explain how protein synthesis is the key to the expression of biological information. (IFS 2018, 15 Marks)

Q4. (a) Explain how unknown five-toed Condylarthra evolved in Equus. State the evolutionary pattern in each geological era. (IFS 2018, 10 Marks)

(b) Discuss the structure and functions of Ribosomes and Golgi bodies with an emphasis on secretion of proteins. (IFS 2018, 15 Marks)

(c) Describe the mechanism of DNA replication. (IFS 2018, 15 Marks)

Paper 2 2018 SECTION B

Q5.(a) Explain enzyme kinetics with suitable examples. (IFS 2018, 8 Marks)

(b) Explain how the biological energy transformations obey the laws of thermodynamics.    (IFS 2018, 8 Marks)

(c) Explain the extrinsic pathway for initiation of blood clotting. (IFS 2018, 8 Marks)

(d) Describe the respiratory regulation of acid-base balance in body fluids. (IFS 2018, 8 Marks)

(e) What is neoteny? Discuss the phenomenon in Amphibia giving suitable example. (IFS 2018, 8 Marks)

Q6. (a) Draw the structure of cAMP. Explain how cAMP acts as second messenger for B-adrenergic receptor system. (IFS 2018, 15 Marks)

(b) Describe the molecular mechanism of skeletal muscle contraction. (IFS 2018, 10 Marks)

(c) Define cloning. Explain somatic cell nuclear transfer method with suitable examples. (IFS 2018, 15 Marks)

Q7. (a) Discuss the transport of oxygen in the blood. Give an account of various factors that shift oxygen-hemoglobin dissociation curve. (IFS 2018, 15 Marks)

(b) Explain enzyme specificity with suitable examples. How is enzyme activity controlled? (IFS 2018, 15 Marks)

(c) Describe the process of metamorphosis in frogs and explain the role of thyroxin. (IFS 2018, 10 Marks)

Q8. (a) What is embryonic induction? Describe the mechanism of induction giving examples. (IFS 2018, 15 Marks)

(b) Enlist the composition of bile. Discuss the role of bile salts in fat digestion and absorption. (IFS 2018, 15 Marks)

(c) What is immunity? Giving suitable examples explain humoral and cell mediated immunity. (IFS 2018, 10 Marks)