Civil Services IAS Mains Exam: Zoology Optional Paper-1 (2019)
Baljit Dhaka
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HCS Mains test series

Civil Services IAS Mains Exam: Zoology Optional Paper-1 (2019)

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Civil Services IAS Mains Exam: Zoology Optional Paper-1 (2019)

Marks-250                                                                                                                                   Time: Three Hours


Q1. Write notes on the following in about 150 words each: 10X5=50 marks

(a) General characters and classification of Porifera.  10 marks

(b) Metagenesis - Does it differ from alternation of generations? 10 marks

(c) Parasitic adaptations in Platyhelminthes.  10 marks

(d) Water Vascular System in Asterias.  10 marks

(e) Connecting link between Reptiles and Aves.   10 marks

Q2.(a) Give an account of Nutrition in Protozoa.  20 marks

(b) What do you understand about Torsion and Detorsion in Mollusca? Elucidate.  15 marks

(c) Give an account on Types of Skulls in Reptilia with the help of relevant diagrams.  15 marks

Q3.(a) Write an account on the Social Behaviour in Apis and Termites.  20 marks

(b) Describe the external features of Nereis. What is Heteronereis and how does it differ from Nereis? Comment upon Metamerism in Annelida.  15 marks

(c) Define Migration and describe various types of Migration in Fishes with suitable examples. Comment upon its significance.  15 marks

Q4.(a) Describe the Dentition in Mammals along with relevant diagrams.  20 marks

(b) Define parental care. Give an illustrated account of parental care in Amphibia.  15 marks

(c) Describe urinogenital system in both the sexes of Amniotes with the help of diagrams only (No description is required). 15 marks


Q5. Write notes on the following in about 150 words each: 10x5=50 marks

(a) Greenhouse effect and its impact on the atmosphere. 10 marks
(b) Biome. 10 marks
(c) Pheromones in alarm spreading. 10 marks
(d) Elephantiasis. 10 marks
(e) Ultracentrifuge.  10 marks

Q6.(a) What is Biogeochemical cycle? Discuss in detail the Nitrogen cycle. 20 marks

(b) Explain orientation and navigation with examples in different animals. Add a note on Homing behaviour. 15 marks

(c) Write the systemic position of a sugarcane pest. Give an account of its life-cycle and the damage caused by this pest. Write a note on its control measures.  15 marks

Q7.(a) Through a labelled diagram show the stages of life history of Mulberry silkworm. Explain various aspects of rearing techniques in sericulture and add a note on different diseases of silkworm.  20 marks

(b) What is community ecology? Explain different stratification in biotic community. Add a note on species abundance and species diversity.  15 marks

(c) Explain the principle and procedure of “ELISA”. Give a note on its application. 15 marks

Q8.(a) Give an account of causes, consequences and control of water pollution. Comment on "Ganga action plan". 20 marks

(b) What is ANOVA? Differentiate between One-way and Two-way ANOVA. Comment on its application in Biostatistics. 15 marks

(c) Describe different types of social hierarchies in primates.  15 marks