UPSC Civil Services Mains Exam: Zoology Optional 2018 Paper-I
Baljit Dhaka

UPSC Civil Services Mains Exam: Zoology Optional 2018 Paper-I

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UPSC Civil Services Mains Exam: Zoology Optional 2018 Paper-I

Marks-250                                                                                                                                        Time: Three Hours

Question Paper Specific Instructions:

Please read each of the following instructions carefully before attempting questions.

  • There are EIGHT questions divided into two sections.
  • A candidate has to attempt FIVE questions in all.
  • Questions no 1 and 5 are compulsory and out of the remaining, THREE are to be attempted choosing at least ONE from each section.
  • The number of marks carried by a question /part is indicated against it.
  • Word limit in questions, wherever specified should be adhered to.
  • Attempts of questions shall be counted in chronological order. Unless struck off, attempt of a question shall be counted even if attempted partly. Any page or portion of the page left blank in the answer book must be clearly struck off.


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

(a) Protostomes and Deuterostomes 10 marks
(b) Peripatus 10 marks
(c) Paedomorphosis 10 marks
(d) Status of Sphenodon 10 marks
(e) General characters of Cetaceans and Primates 10 marks

Q2. (a) Describe the Integumentary derivatives in Mammals along with labelled diagrams. 20 marks

(b) Give an account of the structure and life cycle of Wucheraria bancrofti. Add a note on the pathogenecity and control of the disease caused by this parasite. 15 marks

(c) What is retrogressive metamorphosis? Give an illustrated account of this phenomenon in Herdmania. Also, write a note on its affinities. 15 marks

Q3.(a) Describe different larval forms of Echinoderms and comment on their evolutionary significance. 20 marks

(b) Explain HPA axis. Draw a transverse section of the Adrenal gland and descr?be the functions of its different hormones. 15 marks

(c) Give an illustrated account of the life cycle of Plasmodium vivax. 15 marks

Q4. (a) Give an illustrated account of different types of mouth parts in insects and write a note on their functional significance. 20 marks

(b) Give an account of Migration in birds. Add a note on the problems faced by them during migration. 15 marks

(c) With the help of labelled diagrams only, explain the structure and different stages of the life cycle of Obelia (no description is required). With reference to Obelia, also explain the polymorphism and the status of metagenesis. 15 marks


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

(a) Ozone layer depletion 10 marks
(b) Population dynamics 10 marks
(c) Endemism with reference to India 10 marks
(d) Habituation and Conditioning 10 marks
(e) PCR 10 marks

Q6. (a) What is ecological succession? Give an account of the causes, types and general process of ecological succession in nature. 20 marks

(b) What is eusocialism? Describe this phenomenon with reference to Honey Bees. 15 marks

(c) What is the systemic position of rice pest? Give an account of its life cycle and the damage caused by this pest. Write a note on the measure for its prevention and control. 15 marks

Q7. (a) Give an account of sources, impacts and prevention of air pollution. Comment on Montreal and Kyoto protocol also. 20 marks

(b) What is "Lac-culture"? Explain the methodology employed in lac-culture. Also describe the uses of lac. 15 marks

(c) What is resolution of a microscope? Comment on the principles of SEM and TEM. Describe the structure, working and applications of any one of the electron microscope in biology. 15 marks

Q8. (a) What is biological rhythm? Give an account of its types and characteristics. What is the role of different factors in their entrainment? 20 marks

(b) What is Chi-square test? Give a detailed account of the computation of Chi-square for tests of independence, homogeneity and goodness of fit using biological data. 15 marks

(c) Describe the structure of the pathogen responsible for AIDS. How it is transmitted? Also, mention the pathogenesis and prevention of AIDS. 15 marks