C. S. (Main) Exam: 2011
Paper I
Time·AIlowed 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, wh,'ich 1J1.ust be stated clearly on the c'lver of the answer-book in the space provided for the purpose. No marks will be given for the answers l:Uritten in a medium other than that specified in the Admission Certificate;
Candidates should attempt Questions no. 1 and 5 which are any three of remaining questions selecting at least one question from each Section.
The number of marks carried each question is indicated at the end of the question.
Provide diagrams ·l,n the answer·book, wherever necessary.

SECTION A

1. Briefly describe the importance. of the following: 10x6=60
Somaclonal variation

Lichens in environment

Polarity

Microbes in bioremediation

Cryptogams

Parasexuality



2. Citing suitable examples, explain the following: 20x3=60
What are prions and why is there a need to understand them thoroughly

How are moulds both a bane and boon' for human beings?

The embryo rescue techniques for successful raising of recombinants.


3. Draw well labelled diagrams of the following 15x4=60.
L.S. cone of Selaginella
L.S. capsule of Funaria

Sex organs of Chara


Cleistothecia'of ErysiJihe and Phyllactinia



4. Discuss the role of amphibious plants In the evolution of land plants. 15
Describe to what extent has the technique of micropropagation been successful in achieving our goals. 15
What is meant by modelling and how does it help in disease forecasting? 15
Giving suitable reasons, describe inter-alia. evolutionary status of Psilotum, Selaginella and Marsilea. 15


SECTION B

5. What are the differences between the following: 10x6=60
Systematics and Classification
Fascicular and Cork cambium. .
Megasporogenesis and Megagametogenesis
Apiaceae aJ?d.Umbelliferae
PaJaeozoic and plants •
Isotype and Syntype

6. What are Ubisch bodies? How and where are these formed and what is their role? 5+10=15
What is interxylary phloem? How is it formed? . Support your reply with suitable examples and at least one diagram. 2+3+10=15
Describe the characteristic features of the component on the basis of which the basic souTCelS of a sample of honey is/are determined. 15
Citing suitable examples, explain how laxity in. . quarantine procedure can have disastrous effects. 15

7. Citing suitable examples, defend the statement that "there is need to combine ethnobotany with IPR". 12

Describe various mechanisms employed to raIse hybrids between incompatible species. 12
Explain the role of macro and micro biomolecules in taxonomy. 12
Describe the evolutionary status of Gnetum. 12
What is Nemec phenomenon? Comment on its significance. 12

8. Describe the following
Energy plantations
Gynoecium Poaceae in Asclepiadaceae, Brassicacea and poacoae
Stomatal Paa. apparatus In Brassica, Dianthus and poa
Pollinium
Retting
OTUs

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