civil services mains 2009

BOTANY

Paper II

I Time Allowed Three Hours 11 Ma.xi111um Marks 3oof

INSTRUCTIONS

Each question is printed botlz in Hindi and
in English.

Answers nutst be written 1n the 1nediu1n
specified in the Admission Certificate issued
to you, which 1nust be stated clearly on the
cover of the ans,ver-book in the space
provided for the purpose. No ,narks 1vill be
given for the answers lvritten in a mediuni
other than that specified in the Adrnission
Certificate.

Candidates shollld atten1pt Question Nos. 1
and 5 which are co,npulsory, and any tliree
of the re,naining questions selecting at least
one question fronz each Section.
The nu,nber of nzarks carried by each
question is indicated at the end of the
question.

Answers should be precise and to tlze point.
Provide diagra,ns lll the answer-book,
wherever necessary.

Section

1. Write short notes on any three in about 200 words
each 20x3=60

Organelle genomes
Tautomeric shifts and mutations
Bidirectional synthesis of DNA in E. Coli
Backcross method of breeding

2. Distinguish betveen channels and carrier proteins
and their roles in regulating membrane
transport. 30
Distinguish between Heterochromatin and
Euchromatin. 30

3. Discuss the origin, production and uses of
haploids. 30
Describe biosafety regulatory measures for
raising transgenic crops. 30

4. Comment briefly on the contributions
made by Herman Nilsson-Ehle. 15
List the important statistical methods of
studying association and relationship
between two variables. 15
Give an account of the PCR based molecular
markers and their applications 1n p 1 ant
breeding. 30

Section

5. Write short notes on any three in about 200 words
each: 20x3=60

Crassulacean Acid Metabolism
Stomata) movements
Hydrosere
Kyoto Protocol and CDM

6. Describe the mitochondrial electron transport
chain and theories for ATP synthesis. 30
Describe vemalization and its role 1n
flowering. 30

7. Write short notes on the following 1n about 200
words each 20x3=60
Leaf sene??cence
Physiological effects of ethylene in plants
Ecological pyramids

8. Describe C4 pathway of CO2 fixation. In what
respects does it differ from the C3 pathway?
Mention the specialised anatomical features
associated with C4 photosynthesis. 60

Note English version of the lnstn1ctions is printed on
the front cover of this question paper.
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