The UPSC
Civil Services Main Examination 2011 commenced on October 29, 2011.The
following is the Question Paper of Zoology Paper II of IAS Main Exam 2011.
Zoology
Paper-II
Instructions
Each
question is printed both in Hindi and in English.
Answer
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.
Candidate
should attempt Question Nos. 1 and 5 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 question.
Illustrate
your answer with suitable diagrams, wherever necessary.
1. (a) Discuss the role of various oxidoreductases in metabolism of
glucose (aerobically/ an aerobically) to differentially release ATP
molecules. 15
(b) Using skin colour as an example of polygenic inheritance, work out
the results of F1 and F2 From a mating between pure black Negro man and
quantitative terms. 15
(c) Enumerate the selection pressures that led to bipedal locomotion
in hominids.15
(d) Differentiate between electrical and
chemical synapse. How does summation occur at the axon hillock? 15
2. (a) What is H-antigen ? Illustrate its role in the emergence of Bombay
phenotype. 20
(b) Construct and compare the ‘fate maps’ of gastrula of frog and
chick. Tabulate the tissues/ organs that differentiate and develop from the
three germinal layers.20
(c) Give the chemical composition of human haemoglobin and discuss its
role in O2/CO2 transport during various physiological states. 20
3. (a) Discuss the role of molecular taxonomy in coding of
biodiversity. 20
(b) Write the sequence of stages for production of clonal and
non-clonal embryos by in vitro fertilization (IVF) for transfer in recipient
females(s)/surrogate(s). 20
(c) Compare the neuroendocrine basis of puberty and menopause in
humans. 20
4. (a) Mention the principal steps in the biosynthesis of insulin in
β-cells of the islets of Langerhans. Add a note on the reasons for hypoglycemia
and hyperglycemia, and their effects on body functions. 20
(b) Differentiate between DNA finger-printing and ribozyme
technologies. Add a note on their applications. 20
(c) Identify the reasources and techniques for procuring and
maintaining stem cells, and their cell lines in culture. Add a note on their
biomedical applications. 20
Section-B
5. (a) Compare the sex-determining mechanism of
Drosophila and humans. Add a note on the genic balance theory. 15
(b) Discuss the role of cosmids and artificial chromosomes as vectors
in recombinant DNA technology. 15
(c) Trace the development of heart from the primordial cells during
development of chick. 15
(d) Draw a labelled diagram of a metanephric neuron to explain (i)
ultra filtration, (ii) absorption and (iii) secretion. Define the role of
hormones in these processes. 15
6. (a) Write the characteristics of principal stages of menstrual cycle
and explain its neuroendocrine regulation cyclically. 20
(b) What is hemophilia and how is it inherited? Work out the
results of F1 and F2 mating (with reasons) between: 20
(i) Haemophilic woman x Normal man
(ii) Haemophilic man x Normal woman
(iii) Carrier woman x haemophilic man
(iv) Carrier woman x Normal man
(c) Compare the functions of prostaglandins and histamine Give reasons
for their being considered as hormones. 20
7. (a) Draw a labelled flow chart of β- oxidation of fats to display the
types of enzymes that catalyze the formation of intermediates and step-wise
release of ATP. 20
(b) With suitable examples, compare genetic and induced teratogenesis. 20
(c) Discuss the role of continental drift in the geographical
distribution of animals with suitable examples. 20