IAS Mains Botany Papers 1992
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IAS Mains Botany 1992
Paper-I
Section A
- Answer any three of the following in not more than 200 words each:
- How do eukaryote cells differ from prokaryote cells?
- Write about different types of pollutants.
- How has apomixes helped in evolution?
- Write about commensalisms with examples. How does differ from ammensalism?
- What are mycoherbicides? Explain with examples.
- Give a concise account including control measures, of any four of the following:
- Red rot of sugarcane
- Green ear disease of Bajra
- Yello ear rot of wheat
- Bacterial blight of rice
- Yellow mosaic virus
- Answer the following questions
- Give a short account of the moss protonema
- List three most important characters from which Pteridophytes differ from the Bryophytes.
- Why is Marselia sporocarp not considered a seed?
- Why were Bryophytes not successful on land as the vascular plants?
- Answer the following questions
- How will you differentiate a long shoot from a dwarf shoot in pinus?
- What characters are common to cycads and Fern?
- Compare the mature embryo of Pinus with that of Cycas.
- Tripharic life cycles in Algae. Discuss.
Section B
- Answer any three of the following in not more than 200 words each:
- How does serology help in taxonomy of plants?
- Explain the significance of palynological characters in systematics.
- What characters are used for identification of wood
- Outline the scope, usefulness and limitations of Chemotaxonomy and Numerical taxonomy.
- Answer the following questions
- Write briefly about the following:
- Allergens
- Nodel anatomy and taxonomy
- Endothelium
- Vivipary
- Distinguish between:
- Solanaceae and Ranunulaceae
- Euphorbiaceae and Asclepiadaceae
- Gramineae and Musaceae
- Write briefly about the following:
- Answer the following questions
- Write on causes of pollen incompatibility and suggest methods to overcome the same
- Name the centres of origin and the regions of present day cultivation of any two of the following:
- Black pepper
- Cloves
- Sorghum
- Name the source and economic importance of any two
- Lac
- Teak
- Opium
- Katha
- Give a brief illustrated account of the following:
- Protoplasm culture
- Bordered pit
- Tyloses
- Wood seasoning
- Transfusion tissue
Paper-II
Section A
- Answer any three of the following in not more than 200 words each part:
- Describe the structure of thylakoid membrane in relation to its function.
- What are the principal chromosomal aberrations and how do they alter genetic ratios?
- Give briefly essential features of the development of gene concept.
- Discuss in short role of mutations in evolution.
- Answer the following questions
- What is sex-linked inheritance? Explain with suitable examples.
- Discuss various methods employed in gene mapping.
- How does gene recombination take place in population? Explain genetic drift give basic principles of population genetics.
- Answer any two of the following:
- Write major objectives for plant breeding. Discuss the techniques of breeding used for plant improvement.
- What are his tones? Examine their role as genetic repressors in the light of modern knowledge.
- Critically evaluate the principal mechanism of organic evolution.
Section B
- Answer any three of the following in not more than 200 words for each part:
- What is oxidative pentose phosphate pathway? What is its role in plant metabolism?
- Mention of causes of seed dormancy. Give the methods breaking the dormancy.
- What is SPAC concept? Discuss he importance of this notion in plant water relations.
- Present a brief account of the process of nitrate reduction in plants.
- How is the CO2 concentrating mechanism during photosynthesis achieved in certain plants? Explain in detail this pathway and its superiority over the C3 photosynthesis.
- Answer any two of the following:
- What is plant succession? Discuss the process in relation to water factor.
- Describe the various types of forest met within India.
- Classify growth movements. Briefly mention the hormonal control of tropic movements in plants.
- Answer the following questions
- Write a short account of the need and technique of a forestation programme.
- Mention the complete botanical names of plants yielding the following products, their families, the morphology of the part of economic importance and the uses in each case
- Cashew
- Ginseng
- Til
- Sugarcane
- Describe the role of biotic factors in the determination of plant communities.