W.B Civil Service Examination (Main)- 2009
(Optional Papers)
Botany Paper-I
Time Allowed-3 Hours Full Marks-100
Group - A
Answer any three questions
1. Write brief notes on any four of the following:
(a) Plasmid
(b) Geminivirus
(c) Role of F' factor in eubacteria
(d) Life cycle of chara
(e) Control measure of potato wilt disease
(f) Organ development in flowers 5 x 4
2. Comment on any four of the following:
(a) Industrial uses of bacteria
(b) Role of mycorrhiza in plant development
(c) Stele-evolution in pteridophytes
(d) Alternation of generations in Pinus
(e) Non-ferm features of Ophioglossum
(f) Non-gymnosperm features of Gnetum 5 x 4
3. Explain any four of the folloing:
(a) Nature and function of a bacteriophage
(b) Serotypes of pathogenic bacteria
(c) Inocula nature and function
(d) Host pathogen relation
(e) Fertilization process in salvinia
(f) Function of glands in insectivorous pitcher plant 5 x 4
4. Distinguish between any four of the following:
(a) Virus and viroid
(b) Grampositive and gramnegative bacteria
(c) Heterocyst and endospore's
(d) Soil and airborne disease symptoms
(e) Male and female gametophytes of Pinus
(f) Racemose and cymose inflorescence 5 x 4
5. Give a short account of the following {any four):
(a) Ergot disease of cereals
(b) Importance of algae in industries
(c) Heterosexual behaviour in green algae
(d) Aflatoxin
(e) Heterospory evolution in ferms
(f) Embryo development types in angiosperms 5 x 4
Group-B
Answer any two questions.
6. (a) Define a lichen. Mention its components and discuss their roles. Indicate its roles as pollution indicator. 2+2+2+2
(b) Compare male and female gametophytes of an angiosperm their evolution from a pteridophyte. 4+8
7. (a) Do you consider flower is a telescopic structure ? If so, discuss with reasons. 2+8
(b) Give an account of the occurrence of primitive gymnosperms in the Godwana land. Give suitable examples. 10
8. (a) Trace the evolution of gametophytes in Bryophytes studied by you. 8
(b) Compare the female gametophytes of Pinus with Gnetum-which one do you consider as most evolved ? Give reasons for your answer. 6+1+5
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