ZOOLOGY Paper-I civils mains 2012
I Time Allowed Three Hours I I Maximum Marks 300 I
INSTRUCTIONS
Each question is printed both in Hindi and in English.
Answers must be written in the medium specified in the
Admission Certificate issued to you, which must be stated
clearly on the cover of the answer-book in the space provided
for the purpose. No marks will be given for the answers
written in a medium other than that specified in the
Admission Certificate.
Candidates should attempt Question Nos. 1 and which are
compulsory, and any three of the remaining questions
selecting at least one question from each Section.
The number of marks carried by each question is indicated at
the end of the question.
fllustrate your answers with suitable diagrams, wherever
necessary.
A graph sheet is attached to the question paper for your use.
This may be carefully detached and securely attached to
your answer-book.
Important Note tt!henever a question is being attempted,
all its parts/ sub-parts must be attempted contiguously. This
means that before moving on to the next question to be
attempted, candidates must finish attempting all parts/
sub-parts of the previous question attempted. This is to be
strictly followed.
Pages left blank in the answer-book are to be clearly struck
out in ink. Any answers that follow pages left blank may not
be given credit.

Section-A
1. Answer the following in about 150 words each: 12x5=60
Draw labelled sketches of Alima and Phyllosoma larvae. Identify the neuroendocrine factors that cause metamorphic changes in them.
Compare the structure and function of uricotelic and ureotelic kidney with suitable examples and diagrams.
Differentiate between pheromones and hormones. How do they help in communication and behaviour?
What are the evidences against the traditional concept that pituitary gland is the 'master of endocrine orchestra'? Highlight the current concept on this endocrine gland.
"Birds are glorified reptiles." Justify the statement.

2.
Give an illustrated account of interaction of neuroendocrine secretions in promoting metamorphosis m an orthopteran and a lepidopteran insect. Mention the type of metamorphosis that these insects undergo. 20
What is torsion? How does it occur in certain gastropods? Give an illustrated account of torsion and detorsion in this molluscan class.
Enumerate the anatomical and physiological changes that occur m a venous heart during vertebrate evolution leading to emergence of heart with separate chambers for arterial and venous blood and a pacesetter mechanism.
3.
Draw a labelled diagram of hypothalamohypophyseal ovarian axis, and comment on the following 30 Effect of photoperiod Role of hormones in ovarian cycle Feedback regulation of hormonal cycle
Compare the tornaria larva of Balanoglossus with bipinnaria larva of echinoderm. Give reasons for including Hemichordata as a distinct phylum of invertebrates.
4.
Fasciola, Taenia and Ascaris are adapted to parasitic mode of life. Define the convergent and divergent strategies employed by these parasites for successful existence and propagation. 20
Differentiate among anapsid, diapsid and synapsid reptiles. Give examples. 20
Differentiate between structure and functions of parathyroid hormone and thyroid gland hormones. 20

Section-B

5. Answer the following in about 150 words each: 12x5=60

Draw diagrams to differel)tiate between ecological pyramids based on predator· prey relationship and energy flow in an ecological niche.
What are the merits of remote sensing m sustainable development? Give examples.
With suitable examples and diagrams, explain the concept of ecological succession.
How is the degree of freedom calculated in a chi-square analysis? Use a graph to convert x2 -values to p--values.
Compare the social organization of termites and honeybees.

6.
Differentiate between conditioning and habituation with suitable examples from primates and rodents. 20
What is biological clock and how does it function? Discuss the role of intrinsic and extrinsic factors in its entrainment. 20
Delineate the principal steps m initiating sericulture. Add a note on various aspects of rearing techniques to get quality product in sericulture. 20

7.
Discuss the role of biotechnology in forensic science givmg suitable examples.
Identify and write the characteristics of ectoparasites of catties. Describe the symptoms of their infection and ways to treat them. 20
How do animals navigate in the dark? Use owl and chiropterans as examples, and highlight the features of their navigational sensory equipment. 20
8.
With suitable example(s), enumerate the method for conducting one-way and two-way F-tests. 15
What is PCR? Give an illustrated account of various steps of this technique in DNA amplification. 15
Tabulate the differences among prototherians, metatherians and eutherians with suitable examples. 15
Describe the role of liver and endocrine pancreas in blood-glucose regulation. 15

Note English version of the Instructions is printed on the front cover of this question paper.