W.B Civil Service Examination (Main)- 2004
(Optional Papers)
Botany Paper-I
Time Allowed-3 Hours Full Marks-100
Group - A
Answer any three questions
1. (a) Differences between a gram '+' ve and gram '-' ve bacteria. 4
(b) Describe the structure of endospore and outline the steps in its formation. 4+4
(c) Give a detail account of the generalized and specialized transduction method of genetic recombination. 8
2. (a) How does a 'rot' differ from a 'blight' ? State the symptoms and control measures of 'Stem Rot of Jute' disease. 2+4+4
(b) What are phytoalexins ? State the role of phytoalexin in host parasite interaction. 2+6
(c) What are systemic fungicides ? Give examples. 2
3. Write explanatory notes (any four)
(a) Tetrapolar heterothaliism
(b) Vegetative propagation in Hesaticopsida
(c) Crozier formation
(d) Forms of prothalli in Lycopodium
(e) Cellular permineralization. 5 x 4
4. (a) Describe the life cycle of Cajeochaete with appropriate diagrams. Add a note on the role of the genus in the origin of tracheophytes. 8+4
(b) Draw & describe the structure (ultrastructure) of heterocyst. Point out it's importance in agriculture. 6+2
5. (a) Homospory -----> Heterospory ------> Seed habit, discuss the sequence with appropriate examples from fossil record,
(b) Draw & label the longitudinal section passing through the capsule of Funaria. How are the spores dispersed in the genus ? 4+4
Group-B
Answer any two questions.
6. (a) Characterize the class Gnetopsida. Compare the structure of mature ovule of Pinus and Cneturr. 4+8
(b) Write notes on any two :
i) Economic uses of gymnosperms
ii) Distribution of Cycas in India
iii) Microsporogenesis in anciosponu. 4 x 2
7. (a) Distinguish between the following pairs of families on the floral characters only (any three) :
i) Malvaceae and Cucurbitaceae
ii) Solanaceae and Lamiaceae
iii) Alisroataceae and Magnoliaceae
iv) Acanthaceae and Apocynaceae. 5 x 2
(b) Discuss the importance of Botanic Gardens. 5
8. (a) Give the binomial, family, part used and uses of any three : Vasak, Ground nut. Cotton, Mustard. 4x3
(b) Explain with examples the different modifications of seeds and fruits for wind dispersal. 6
(c) Give binomial of two plants in the vegetation of Sunderbans. 2
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