W.B Civil Service Examination (Main)- 2006
(Optional Papers)
Botany Paper-I
Time Allowed-3 Hours Full Marks-100
Group - A
Answer any three questions
1. Write notes on the following (any two):
(a) (i) Structure of baekterio phage; (ii) Nature of chemical compo-sition in gram-ve bacteria; (iii) Lysogeny; (iv) Bacterial flagellum. 4 x 2
(b) What is blight ? Describe the symptoms and control measures of the disease "Late blight of potato". 1+3+4
(c) Give a brief account of the following (any one):
(i) Economic uses of Lichen; (ii) Aflatonin; (iii) Plasmid. 4
2. Comment on the following structures (any two):
(a) (i) Hetero Cyst; (ii) Auxo spore; (iii) Primary and secondary inocula. 4 x 2
(b) Give a brief account of the following :
(i) Post fertilisation changes in Polysiphonia; (ii) Nanandrous species of Oedogonium; (iii) Ascocarp of Ascobolus. 4 x 3
3. (a) Discuss the evolution of gamctophytes in bryophytes studied by you. 12
Or,
Distinguish between the internal organization of sporogonium in Marchantia and Porella with labelled sketches.
(b) Write notes on the following (any two):
(i) Mature Sporophyte of Anthoceros, with points of advancement, (ii) Rhizophore of Selaginella. (iii) Structure of capsule and spore dispersal in sphagnum. 4 x 2
4. (a) Distinguish between homospory and heterospory. Give a comparative account of the strobilli of one homo and one hetero sporous ptcridophytes that you have studied. 2+8
Or,
Answer any two of the following :
(i) Stem anatomy of calamities; (ii) Sporangia of Psilotum; (iii) Morphology of the spike of Ophioglossum. 5 x 2
(b) Answer any two of the following :
(i) State the characteristic features of Rhynea. (ii) Write a short ac-count of the soral morphology of Pteris, mentioning the position of sori and spore dispersal, (iii) Give a brief account of the gametophytes of Lycopodium. 5 x 2
5. (a) Compare the female gametophytes of Pinus and Gnetum. Which one is considered as most evolved among gymno sperms ? Name one Indian species under each of Cycas and Pinus. 7+3+2
(b) Comment on the following :
(i) Archaeopteris. (it) Fern nature of Cycas. 4 x 2
Group-B
Answer any two questions.
6. (a) State the morphological characters of the flowers by which self-pollinated flowers can be identified from the insect pollinated.
Describe the process of pollination in any one of the following :
Salvia, Ficus. 8 + 3
(b) Place the following plants into their respective families, state their economic uses and the parts used (any three):
Jute, Coffee, Ginger, Mustard, Coconut. 3 x 3
7. (a) Distinguish between the following families on the basis of characters mentioned against each pair (any three):
(i) Cucurbitaceae and Rubiaceac (Gynaecium); (ii) Solanaceae and Labiatae (Corolla); (iii) Compositae and Umbelliferae (Fruit); (iv) Cruciferae and Magnoliaccae (Androecium). 3 x 3
(b) State the importance of Herbarium. Mention the procedures in maintenance of herbarium. Name two important herbaria in India. 2+3+1
(c) (i) State the nature of fruit in Gramineae; (ii) Economic importance of Zingiberaceae; (iii) Inflorescence of Euphorbiaceae. 2+2+1
8. Answer any two of the following :
(a) Why the phyllo genetic system of classification is preferred over natural system ? Comment on the merits and demerits of the natural system of classification of Bentham and Hooker. 6+4
(b) Describe the formation of female gametophyte in angiosperm with neat labelled sketch. 8+2
(c) Comment on the following structures :
(i) Diplostemonous androecium; (ii) Syngenesious stamens; (iii) Monochlamydeous flower; (iv) Accrescent calyx; (iv) Liguladate corolla. 2 x 5
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