(Download) UPSC IAS Mains Exam Paper - 2017 : Zoology

ZOOLOGY
Paper - 1

Time Allowed : Three Hours

Maximum Marks : 250

QUESTION PAPER SPECIFIC INSTRUCTIONS

(Please read each of the following instructions carefully before attempting questions)

There are EIGHT questions divided in two Sections and printed both in HINDI and in ENGLISH.

Candidate has to attempt FIVE questions in all.

Question Nos. 1 and 5 are compulsory and out of the remaining, THREE are to be attempted choosing at least ONE question from each Section.

The number of marks carried by each question/part is indicated against it.

Answers must be written in the medium authorized in the Admission Certificate which must be stated clearly on the cover of this Question-cum-Answer (QCA) Booklet in the space provided. No marks will be given for answers written in a medium other than the authorized one.

Assume suitable data, if considered necessary, and indicate the same clearly.

Unless and otherwise indicated, symbols and notations carry their usual standard meanings.

Attempts of questions shall be counted in sequential 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 Question-cum-Answer Booklet must be clearly struck off.

SECTION-A

Q1. Answer the following in about 150 words each :

(a) Differentiate between major and minor phyla. Describe the salient features of any one minor phylum.
(b) Some fishes can breathe air. Elaborate.
(c) Explain the types of metamorphosis in insects and their hormonal regulation.
(d) Give general features and examples of egg-laying mammals and pouched mammals.
(e) Discuss the origin of Tetrapods.

Q2. (a) Give an account of larval forms in Crustacea with examples and diagrams. Also write a note on the significance of larvae.
(b) Give the structure of cnidoblast, the defensive organ in Cnidaria. Also, describe its mechanism of action.
(c) What are Bilateria ? Explain the theories of origin of Bilateria.

Q3. (a) Give an elaborate account of various flight adaptations in birds.
(b) Explain various types of dentition in mammals.
(c) Describe the roles of three eye layers in vision in humans.

Q4. (a) Give an account of evolution of aortic arches in reptiles, birds and mammals.
(b) Discuss respiration in Mollusca indicating suitable examples.
(c) Explain primitive, degenerate and advanced characters of Branchiostoma. Comment on its systematic position.

SECTION-B

Q5. Answer the following in about 150 words each :

(a) Describe FISH : Principle, Procedure and Applications'.
(b) What are Ecotones ? Are wetlands ecotones ? Justify.
(c) Discuss Thermal Pollution and its preventive measures.
(d) How is 'Composite Carp Culture advantageous over 'Traditional Carp Culture' ?
(e) Explain the role of chemical signals in alarm spreading.

Q6. (a) Mention the advantages of social living. Describe different types of social hierarchies in primates.
(b) Discuss the concept and importance of genetic counselling and gene therapy.
(c) Write about phase contrast and fluorescence microscopy with notes on their principles and applications in Zoology.

Q7. (a) What is meant by biostatistics ? Explain the role of correlation, regression and ANOVA in data analysis in Zoology.
(b) Elaborate the term 'Ecosystem' and explain its structural components with examples. Comment on Trophic Dynamics concept.
(c) Explain the principle, types and applications of ultracentrifuge.

Q8. (a) Discuss environmental degradation with regards to inland water resources. Suggest measures to restore the water quality of our rivers, lakes and reservoirs.
(b) What is meant by Biodiversity ? Explain Protected Area Networking w.r.t. their establishment, monitoring and management.
(c) Explain adaptations of animals inhabiting fast flowing waters.

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ZOOLOGY
Paper - 2

Time Allowed : Three Hours

Maximum Marks : 250

QUESTION PAPER SPECIFIC INSTRUCTIONS

(Please read each of the following instructions carefully before attempting questions)

There are EIGHT questions divided in two Sections and printed both in HINDI and in ENGLISH.

Candidate has to attempt FIVE questions in all.

Question Nos. 1 and 5 are compulsory and out of the remaining, THREE are to be attempted choosing at least ONE question from each Section.

The number of marks carried by each question/part is indicated against it.

Answers must be written in the medium authorized in the Admission Certificate which must be stated clearly on the cover of this Question-cum-Answer (QCA) Booklet in the space provided. No marks will be given for answers written in a medium other than the authorized one.

Assume suitable data, if considered necessary, and indicate the same clearly.

Unless and otherwise indicated, symbols and notations carry their usual standard meanings.

Attempts of questions shall be counted in sequential 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 Question-cum-Answer Booklet must be clearly struck off.

SECTION-A

Q1. (a) What is meant by a ‘Lamp brush' chromosome ? Explain its structure and functional significance.
(b) What are multiple alleles ? Explain the phenomenon of multiple allelism by giving suitable examples.
(c) Explain in brief the role of 'isolation in evolution by giving suitable examples.
(d) Differentiate between molecular taxonomy and classical taxonomy.
(e) Explain ‘Whole animal cloning' by giving suitable examples. Enumerate the steps involved in whole animal cloning.

Q2. (a) What is protein targetting ? Illustrate the same with reference to transport of proteins to plasma membrane.
(b) What is meant by RFLP ? Explain the applications of RFLP.
(c) What is meant by molecular drive ? Explain its significance in evolution giving suitable examples.

Q3. (a) Explain in detail the structural organisation and functions of Golgi-Complex.
(b) Outline the course of evolution of modern day horse.
(c) Bring out the differences between prokaryotic and eukaryotic gene organisation.

Q4. (a) Give a brief account of the various theories of 'Origin of Life' on earth.
(b) What is a ‘CLADE' ? Explain the importance of cladistics' in evolution.
(c) Explain in detail how a DNA molecule gets organised into a chromosome ?

SECTION-B

Q5. (a) What are 'Co-enzymes'? Explain their importance in metabolism.
(b) What is a morphogen ? Explain its role in embryonic development.
(c) Describe the process of digestion and absorption in small intestine.
(d) What is meant by Rh factor ? Explain Rh incompatibility in human beings.
(e) What are homeotic genes ? Explain with the help of suitable examples.

Q6. (a) Give a comprehensive account of gaseous transport in blood.
(b) Describe the ultrastructure of 'Sarcomere' and explain the process of muscle contraction.
(c) Explain the process of oögenesis. Discuss the importance of meiotic arrest during oogenesis.

Q7. (a) What is an Organiser? Explain the role of Organiser in axis formation in amphibians.
(b) Discuss antibodies as key players of humoural immunity.
(c) Give the structure of cyclic AMP and discuss its role as a second messenger by giving suitable examples.

Q8. (a) Illustrate the organisation of electron transport particles on the inner mitochondrial membrane and explain their role in ATP synthesis.
(b) What is menopause ? Discuss its occurrence, consequences and significance in human females.
(c) What are stem cells ? Discuss their sources, types and applications in human welfare.

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