W.B Civil Service Examination (Main)- 2008
(Optional Papers)
Botany Paper-II
Time Allowed-3 Hours Full Marks-100
Group - A
Answer any three questions
1. Answer any five of the following :
(a) what are meant by 'light-harvesting complexes' (LHCs) ?
(b) Distinguish between antibiotic and antibody.
(c) What do you understand by allosteric enzyme ? Cite two examples.
(d) What is cAMP ? State its major functions.
(e) Differentiate between autecology and synecology.
(f) What is meant by Ozone hole ? What are the major hazards caused due to Ozone hole ? 4x5
2. Answer any five of the following :
(a) Name of principal pollutants responsible for air pollution. Mention its sources.
(b) Briefly state the role of Pollution Control Board.
(c) What is meant by energy flow in eco-system ? Point out the features of energy flow.
(d) What are 'Red Data BooK' and 'Green Data Book' ?
(e) What are Xerophytes ? Cite two examples of Xerophytic plant found in India.
(f) Distinguish between 'Biological Oxygen Demand' and 'Chemical Oxygen Demand'. 4x5
3. Answer any five of the following :
(a) What are euchromatin and heterochromatin ?
(b) What do you understand by DNA supercoiling ?
(c) What is frame shift mutation ?
(d) Distinguish between 'lagging strand' and 'leading strand' during DNA replication.
(e) What do you understand by polycistronic mRNA ?
(f) What is polymerase chain reaction ? 4x5
4. Answer any five of the following:
(a) Give the scientific names and families of the plants yielding
(i) Vasicine (ii) Nicotine (iii) Betanidin (iv) Holaphyllamine
(b) Mention the scientific name and family of the plant yielding paddy. Discuss the climate and type of soil suitable for cultivation of paddy.
(c) Refer the following plants to their respective families and mention their useful parts :
(i) Aloe Vera (ii) Daucus carota (iii) Cocos nucifera (iv) Vigna radiata
(d) What types of physiological adaptations are found in Ratophytes ?
(e) Give the scientific name of two drug yielding plants and mention their respective family and part used.
Group-B
Answer any two questions.
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