ZOOLOGY Paper-II 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.
Illustrate your answers with suitable diagrams, wherever
necessary.
Important Note Whenever a question is being attempted,
all its parts/ s u b -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.
How does the structure of antibody give its specificity of functions? Add a note on the causes of allergic reaction. 15
On your answer-book, write down the name of each of the ganglia marked to in the diagram below on the parasympathetic and sympathetic divisions of autonomic nervous system <img src='./qimages/704-1b.jpg'> How do they regulate the visceral and reflex functions of the body? 15
Compare the role of pancreatic and intestinal glandular secretions in the digestion of food. 15
Differentiate between the mechanism of capacitational changes in the mammalian sperm under in vitro and in vivo conditions. How are these sperms stored and used in artificial insemination and in vitro fertilization? 15

2.
Differentiate between polytene and lampbrush chromosomes on the basis of their structure and functions. 20
Using suitable examples of natural and induced mutations, discuss their role in the evolution of species. 20
Compare the action of steroidal and peptide hormones at organismal and cellular levels. 20
3.
Define the types of cell receptors and enumerate their role in signal transduction/ cell-cell interaction. 20
Discuss the trends in primate evolution that began as an adaptation for arboreal life. 20
What controls heartbeat, and the rate at which blood flows through the circulatory system?

4.
Differentiate between principles and methods of DNA cloning and whole animal cloning.

What are morphogens? How do they function during various stages of morphogenesis (use frog/ chick as an 20 example)? 20
Draw a diagram to show the arrangements of various types of contractile proteins in skeletal muscles, and explain the bioenergetics of contraction.

Section-B
5.
Give the chemical composition of mammalian semen (use humans as example). How does seminal fluid contribute to sperm survival, capacitation and acquisition of fertilizing ability? 15
Compare the structure and function of 30s and 70s ribosomes. 15
What is DNA motif How does it facilitate DNA replication and transcription?
Through a chequerboard, display the various types of genetic code 3 Identify the initiation, termination and nonsense codon, and explain their functions. 15

6.
Discuss the interactive role of thyroxine and prolactin during various phases of growth and differentiation in amphibian metamorphosis. 20
What 1s Rh factor and how is it determined? What is the cause and what is/ are the symptom(s) of erythroblastosis fetalis, and how can it be corrected?
With suitable examples, compare the chemical structure and functions of acetylcholine (in cholinergic adrenaline (in adrenergic neuron) and serotonin/ 5-hydroxytryptamine /y-amino- butyric acid (in peptidergic neurons). 20
7.
Enumerate the factors responsible for cell senescence and death. 20
Give the causes and symptoms of heritable diseases in man due to defects in Y-chromosomes and autosomes. 20
How do isolation factors facilitate speciation?

8.
What is mitotic cell cycle? How does it differ from meiotic cell cycle? Add a note on their molecular regulation. 20
Mention the role of ion channels ion gates) and ion pumps in cell functions with appropriate examples and diagrams. 20
What are transgenic animals? How are they produced and utilized m ecoreha bili tation conservation and m human welfare? 20

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