civil services mains EXAM, 2009

BOTANY

Paper-I

Time Allowed Three Hours Maximum Marks 300

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 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 the
question.

Provide diagrams in the answer-book,
wherever necessary.

Section-A

1. Answer any three of the follovving in not more
than 200 words each 20x3=60

Narne three enzyines commonly used for
the isolation of plant protoplasts. Which
of the following tissues would give a
better yield of enzymatically isolated
protoplasts and why?
Aerenchyma
Mesophyll

What cellular/ subcellular changes
would demonstrate polarity induction
in cell suspensions? How can these
changes be demonstrated?

Compare the methods of asexual and
sexual reproduction in Zygomycota,
Ascomycota and Basidiomycota.

Compare the nature of photosynthetic
pigments and carbohydrate reserves
in Euglenophyta, Bacillariophyta and
Phaeophyta.

2. Comment on the following (in about 200
words each) 20x3=60

Heterotrichous habit of growth in moss
protonema
Differences between hydroids and
leptoids
Structure of chloronema and caulonema
cells in mosses

3. Write brief notes on the following (in not
more than 200 words each) 20x3=60

Semi-moist preservation of food
Fructifications in cup-fungi
Microbes in the control of water
pollution

4. Write brief notes on the following (in not
more than 200 words each) 20x3=60

Iron bacteria
Cleavage polyembryony
Thallus organisation in Chlorophyceae

Section-B

5. Answer any three of the following in not more
than 200 words each 20x3=60

Diagrammatically explain the structurefunction
relationship of plasmodesmata.
Comment on the formation of
amphivasal vascular bundles 1n
Dracaena
Name the genera belonging to phylum
Gnetophyta. Mention their angiospermlike
features, types of tracheary
elements and leaves.
What are the salient features of
Bennettitales?

6. With the help of well-labelled diagrams,
explain the distinguishing features of the
following 20x3=60

Porogamy and Chalazogamy
Flower of Dolichos and Caesalpinia
Ovule of Gnetum and Pinus

7. Write critical notes on the following: 20x3=60
Plants as sources of insecticides
(Pyrethrin and Rotenone)
Contributions of the following scientists
in plant systematics
A. P. de Condolle
Carl Linnaeus
Theophrastus
Significance of Energy Plantations

8. Discuss the following 30x2=60

Tetrasporic embryo sac
Omega taxonomy with reference to
chemical substances

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