W.B Civil Service Examination (Main)- 2005
(Optional Papers)
Botany Paper-I
Time Allowed-3 Hours Full Marks-100
If the question attempted are in excess of the prescribed number only the questions attempted first up to the prescribed number shall be valued and the remaining ones ignored.
Answer may be given either in English or in Bengali but all answers must be in one and the same language.
Group - A
Answer any three questions
1. Write brief notes on any four of the following :
(a) Structure of flagella of Gram-ve bacteria.
(b) Asexual reproduction in vaucheria sp.
(c) Role of mycorrhiza in forest development.
(d) Koch's postulates.
(e) Sporohphyte of Anthoceros sp.
(f) Anatomy of stem of Lyginopteris oldhamla. 5 x 4
2. Comment on the following : (any four)
(a) Complementary chromatic adaptation.
(b) Coralloid root of Cycag sp.
(c) Lysogeny.
(d) Incubation period.
(e) Role of enzymes in pathogenesis.
(f) Fruit body of Ascobolus sp. 5 x 4
3. (a) Write in brief steps of endospore formation. 5
(b) Compare the spore dispersal mechanism of Porella sp. and Funaria sp. 5
(c) Give an account of the symptoms and control measures of the disease 'Late blight of potato'. 5 x 5
4. Give brief answers : (any four)
(a) Cell wall and pigments in Cyanophyceae.
(b) Economic importance of Bacillariophyceae.
(c) Ecological significance of lichens.
(d) Mention the sources and uses of protese and glautmic acid.
(e) Structure of a plant virus. 5 x 4
5. Distinghish between any four of the following :
(a) Cystocarp are sperrnocarp.
(b) Male cone of Sycas sp and Pinus sp.
(c) Cellular permineralization and autoigenic preservation.
(d) Compare the morphology of photossynthetic tissues of Riccia sp. and Marchantta sp.
(e) L.S. of strecelus of Lcopodium sp and Selaginella sp. 5 x 4
Group-B
Answer any two questions.
6. Define the following terms citing suitable examples and with illustrations (any four) :
(a) Fetrady namous stamen.
(b) Interpetiolar stipule.
(c) Syngenceious androceium.
(d) Chathium inflorescence.
(e) Androgynophore. 5 x 4
7. (a) Discuss briefly the role of an ideal botanical garden. 6
(b) Draw and describe any two types of ovules as found in angiosperms. 8
(c) Economic importance of solanaceae. 4
(d) Define indented key.
8. (a) Answer any two of the following :
(i) Diagonostic characters of Leguminosae.
(ii) Contrivances for anemophily and zoophily.
(iii) Major difference of aggregate fruits and composite fruits.
(iv) Inflorescence of Labiatae. 4 x 2
(b) Give botanical names of the plants yielding the following products, assign them to their respective families and comment on economic importances, (any three)
(i) Junt (ii) Tea (iii) Cotton (iv) Rubber. 4+4+4
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