civils mains 2013 ZOOLOGY
Paper I
Time allowed: Three Hours

Maximum Marks: 250

Question Paper Specific Instructions

Please read each ofthe 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.
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 ofmarks carried by a 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 Booklet in the space provided. No marks will be given for answers written in a medium other than the authorized one. Word limit in questions, wherever specified, should be adhered to.
Illustrate your answers with suitable sketches and diagrams, wherever considered necessary. Attempts of questions shall be counted in chronological order. Unless struck attempt of a question shall be counted even if attempted partly. Any page or portion ofthe page left blank in the answer book must be clearly struck off.

SECTION A

Ql. Answer the following in about 150 words each; 10x5=50
Comment on the evolutionary change in the proportion of limbic system versus cerebral hemisphere in vertebrates. 10
What is circadian and circannual rhythm? Discuss briefly the influence of exogenous cycles on these rhythms. 10
Describe locomotion in Hirudinaria. 10
Draw a labelled diagram of alimentary canal and salivary apparatus in Periplaneta americana. 10
Describe hyoid apparatus in Frog or Necturus. 10

Q2. Describe the functional anatomy of neuro-endocrine inter-relationship in mammalian hypophysis. Name hypothalamic and hypophyseal hormones in the tabular form showing their functional relationship. With the help of the diagram only, explain feedback mechanism in the HPG axis. 25

Write an account of parental care in Amphibia. 25

Q3. Through a comparative chart, give an account of accessory sex glands in the male vertebrate animal types such as dogfish, frog, lizard, pigeon and rabbit. 25

Give an elaborate account of canal system in Porifera and discuss the taxonomic importance of spicules. 25

Q4. Give an account of coral reefs, their constituent compartments and significance. 25

Describe the life cycle of Taenia solium through a labelled diagram only and discuss its parasitic adaptations. 25

SECTIONB.

Q5. Answer the following in about 150 words each: 10x5=50
While using a compound microscope, how will you know how much you are magnifying an object? Through a diagram show the relative working distance under low and high powers. 10
Define 'insight'. Explain this behaviour using the example of
Chimpanzees. 10
What is forensic biotechnology? Discuss its significance. 10
(d)Describe the method of studying animal behaviour using T-maze. 10
Through a labelled diagram, show the stages of. life-history of Bombyx mori. 10

Q6. Describe the carbon cycle and discuss its peculiarities. How do human activities interfere with the carbon cycle? 25
Define ecosystem. Discuss the dynamics of the ecosystem and the factors influencing it. 25
Q7. State briefly what are biomes, ecotones and ecological succession. Give an account of the causes, trends and general process of ecological succession in nature. 25
What is filariasis Discuss the structure and life-history of filarial worm. Highlight its pathogenic aspects and preventive measures. 25

Q8. What is the principle of spectrophotometry Discuss the details of instrumentation and application of spectrophotometer. Comment upon the common feature of spectrophotometric assay and ELISA, if any. 25
Name four human genetic diseases. Give an account of human genome research and its applications. 25