IAS Mains Botany Papers 1993

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IAS Mains Botany 1993


Section A

  1. Answer any three of the following in not more than 200 words each:

    1. Define Bio-control. Give examples of diseases controlled using this method.

    2. Describe the different ways by which genetic variation is brought about in bacteria.

    3. Write an account of the different aspects of microbiology in relation to human welfare.

    4. How viruses differ from other prokaryotes?

  2. Write in detail with illustration about any four of the following diseases:

    1. Late blight of potato

    2. Tabacco Mosaic Virus

    3. Tikka disease of ground-unit

    4. Citrus canker

    5. Loose smut of wheat

  3. Answer the following questions

    1. How would you differentiate between a leafy liverwort and a moss?

    2. Describe the feren-like structure of Cyacas.

    3. Write about the development eof rhizophore in Selaginella.

    4. Write in short about:

      1. Bars of sanio

      2. Centripetal and centrifugal xylem

      3. Pollen grains of Cycas and Ephedra

  4. Answer the following questions

    1. Write in brief about any four:

      1. Pigmentation in algae

      2. hetereotrichy

      3. Palmelloiid stage

      4. Cystocarp in red algae

      5. Diplanetism

      6. compatibility

    2. Virus directs the machinery of the host for its own reproduction. Explain

    3. What are lichens? Apart from lichens, where else algae have associated with other organism?

Section B

  1. Answer any three of the following in not more than 200 words each:

    1. Why international rules of botanical nomenclature are important and when were they propounded? What are the main principles governing these rules?

    2. Discuss the role of tissue culture in production and propagation of virus-free plants.

    3. Discuss the role of biosystematics in the understanding of the taxonomy of angiosperms.

    4. What are the advantages of using plant cell culture to produce industrial compounds? Explain the term biotransformation

  2. Answer the following questions

    1. What is extracellular cambium? Discuss about it activity with examples.

    2. Write note on:

      1. Pllen development in Cyperaceae

      2. Embryo sac-like pollen grains

      3. Anther tapetum

      4. unorganized embryo

    3. What are penumatophores and in what type of habitat are they found?

  3. Answer the following questions

    1. Why the Compositae are regarded as the most highly evolved taxon?

    2. What is it useful in agro-forestry?

    3. How vegetation helps in control of pollution?

  4. Answer the following questions

    1. What are the sources of the following? In what way are the economically important?

      1. Ergot

      2. Pencillin

      3. Yeast

      4. Agar-agar

    2. Name the source and economic importance of any two:

      1. Tea

      2. Arrowroot

      3. hashish

      4. Cashew-nut

    3. State the Latin names, families, morphology and specific part of the plants from which the following are obtained

      1. Coir

      2. Cotton

      3. Flax

      4. hemp

      5. Jute

    How are the different form each other?


Section A

  1. Answer any three of the following in not more than 200 words for each part:

    1. What are the criteria for distinguishing between autopolyoidy and allopolyploidy?

    2. How does epistasis differ from dominance?

    3. Histones act as gene repressors and hormones as gene activators. Explain.

    4. Point out the differences between point mutation and chromosomal aberrations.

  2. Answer the following questions

    1. Explain the chromosome theory of inheritance.

    2. How will you demonstrate that the genetic crossing over has a cytological basis?

  3. With the help of suitable diagrams bring out the differences between meiotic and meiotic prophase.

  4. Answer any two of the following:

    1. What is hybrid vigour? Mention its utilization and achievements in plant breeding.

    2. Genetic activity is not the sole monopoly of the nucleus. Explain.

    3. What are the isolating mechanisms, which play a part in the evolution of plant species?

Section B

  1. Answer any three of the following in not more than 200 words for each part.

    1. Write on the metabolic pathway of aerobic respiration.

    2. What do you understand by C3, C4 and CAM plants?

    3. Describe the role of man as an ecological factor.

    4. Discuss in short the regulation of protein synthesis.

  2. Photosynthetic pigments are organized into two systems with different photochemical function. Comment.

  3. Answer any two of the following:

    1. Is the concept of Florigen purel hypothetical? Can in be homologous to Gibberellins?

    2. Write on energy flow in ecosystem.

    3. Describe in brief the biogeochemical cycle.

  4. Answer the following questions

    1. What is social forestry? What are its advantages?

    2. What are herbicides? What is the effect of herbicides on seed germination, seed dormancy and growth?

    3. Name the plants, their families and the parts of plant from which following is obtained:

      1. Indigo

      2. Quinine

      3. Nicotine

      4. Saffron

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