W.B Civil Service Examination (Main)- 2006
(Optional Papers)
Botany Paper-II
Time Allowed-3 Hours Full Marks-100
Group - A
Answer any three questions
1. Answer any five questions. 4 x 5 = 20
(a) What is apoplast and symplast ?
(b) Comment on the dark period in plants,
(c) What is Law of Limiting factor ? What is its significance ?
(d) What is acid rain ? How does it effect the plants and our forest ?
(e) Give the specific reaction of glycolysis which is oxidative in nature. How many moles of ATP are produced by substrate level phosphorylation in glycolysis ?
(f) What do you mean by competitive and non-competitive inhibition in enzymatic action ? Give specific examples of each type.
2. Answer any five questions : 4 x 5 = 20
(a) What is cutrophication ?
(b) Define biodiversity. How has deforestation affected biodiversity ? Give some (at least two) preventive measures against this,
(c) What is soil erosion ? How can you control it ?
(d) Describe with neat sketches the different stages of succession in pond,
(e) What do you mean by ephemeral plants ? Give at least two examples,
(f) Distinguish between glyoxysomes and perioxysomes.
3. Answer any five questions : 4 x 5= 20
(a) What are microchromosome and minichromosomc ?
(b) Explain emasculation,
(c) Describe in short the roles of three different RNAs in protein synthesis,
(d) What is mutator gene ? — Explain,
(e) Distinguish between double trisomic and tetrasomic.
(f) Explain DNA finger painting.
4. Answer any five questions : 4 x 5 = 20
(a) Give the scientific name and families of plant yielding—
(i) Teak, (ii) Quinine, (iii) Ground nut, (iv) Coco.
(b) Mention the scientific nameund family of the plain yielding wheat. Discuss the climate and type of soil suitable for wheat cultivation.
(c) Refer the following plants to their respective families and men-tion their useful parts :
(i) Arachis hypogea, (ii) Linum Ustitatissimum, (iii) Glycine max, (iv) Lens esculenta.
(d) What types of adaptations are found in hydrophytes ?
(e) Give the scientific name of two oil yielding plants (one each from monocot and dicot). Mention their respective family and parts used.
(f) Give the medicinal use of Bask and Rauvolfia. Mention their scientific name and respective family.
5. Answer any four questions : 5 x 4 = 20
(a) What is Z-DNA ? How it differs from normal B-DNA ?
(b) What is apoenzyme ? Give the mechanism of protease activity.
(c) What is redox potential ? Explain it with the help of electrochemical gradient,
(d) Explain protoplast fusion,
(e) What is transcription and translation ?
Group-B
Answer any two questions.
6. Attempt any five questions : 4 x 5 = 20
(a) Why is photosynthesis not possible in shorter or longer wave lengths of the visible range of light ?
(b) What do you mean by critical photoperiod and photoperiodic induction ? — Explain,
(c) Briefly elucidate the mechanism of uptake of ion against concentration gradient,
(d) Elucidate diagrammatically the biosynthesis of ct-kctoglutaric acid from pyruvic acid mentioning the enzymes, coenzymes and the utilization or, production of ATP,
(e) State briefly the types of duplication or, replication of DNA.
(f) What are intercalating agents ?
7. Attempt any five questions : 4 x 5 = 20
(a) What do you understand by reductional and equatorial division ?
(b) Explain, briefly, the semi-conservative DNA replication,
(c) Briefly discuss the role of poly ploidy in crop improvement,
(d) State the advantages of genetic engineering,
(e) What are the different genes associated to protein synthesis ?
(f) What is pletonemic and paranemic coiling ?
8. Answer any five questions : 4 x 5 = 20
(a) Explain the climax vegetation,
(b) Explain why the RQ of fatty or proteinaceous matter is less than one. When RQ = 0.
(c) Give the scientific name of Ginger. Name the family to which it belongs. What are the medicinal uses of the plant ? Name the active principles of Ginger,
(d) Refer the following plants to their respective families and briefly state their economic importance mentioning the nature of plant parts used :
(i) Carchorous capsularis. (ii) Madhuca indica. (iii) Carthamus tinctorius. (iv) Aleurites fordii.
(e) What are the major differences in structural organisation of eukaryotic with that of prokaryotic ones ?
(f) With suitable examples and reaction, explain transmination and nitrification.
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