IAS Mains Botany Papers 1994

IAS Mains Botany 1994

Paper-I

Section A

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

    1. Which features does Anthocers share with Pteridophytes?

    2. Explain the mechanism of a symbiotic nitrogen fixation.

    3. What are the criteria that must be met to prove that an organism is a pathogen?

    4. Examine the salient features of microphylls and megaphylls.

  2. Write about the causal organism, symptoms and methods of control of any four of the following plant diseases:

    1. Koleroga of Coffee

    2. Black rot of Cabbage

    3. Powdery mildew of Wheat

    4. Sheath blight of Rice

    5. Bud rot of Cocount

  3. Answer the following questions

    1. Write an account on vegetative propagation in hepaticae.

    2. Give an account of life-cycles in Rhodophyceae.

    3. Explain the soral thpes in fems based on the order of development of Sporangia. What is phyletic slide?

  4. Answer the following questions

    1. Discuss the morphological nature of the rhizophore in Selaginella.

    2. Describe the mechanism of conjugation in bacteria.

    3. Write explanatory notes on the following:

      1. Sex chromosomes in Bryophytes

      2. Heterocyst

      3. Elaters

      4. Male flower of Gnetum

Section B

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

    1. Magnoliales possess evolutionarily primitive flower. Substantiate.

    2. indicate the role of anatomy in angiosperm systematic.

    3. Outline the technique of pollen culture. Indicate its importance.

    4. What are mangroves? How do they adapt to the habitat?

  2. Answer the following questions

    1. Write an account on the secondary growth in lianas

    2. Explain the applications of mocropropagation.

    3. Comment on the following:

      1. Phlem in gymnosperms and angiosperms.

      2. Male gametophyte in Cycas, Pinus and angiosperms

  3. Answer the following questions

    1. What is periderm? Explain its development in monocoty ledons.

    2. Write an account on the importance of Karyotypein taxonomy.

    3. Distinguish between:

      1. Alpha taxonomy and omega taxonomy

      2. Homocellular and heterocellular rays

      3. Polygonum and Oenothera types of embryo sac

    4. Give an account of adventive embryonic.

  4. Answer the following questions

    1. Give the floral formula and draw the floral diagram a diandrous orchid.

    2. What is stomatal apparatus? Explain the different stomata types.

    3. Write explanatory notes on any three of the following:

      1. Dichogamy

      2. Sycouns

      3. Vessel less angiosperms

      4. Amphivasal vascular bundle

    4. Name the source and economic importance of any three of the following:

      1. Asafoetida

      2. Senna

      3. Haematoxylin

      4. Sal

      5. Manila hemp

Paper-II

Section A

  1. Answer the following questions

    1. With the help of a diagram, explain the ultra structure of the granum of chloroplast.

    2. What is the modern concept of cell membrane?

    3. What do you understand by genetic code?

    4. What are the exceptions to Mendel's laws? Explain with examples

  2. Discuss the numerical changes in chromosomes and their importance. How can triploids lead to seedless ness?

  3. Answer the following questions

    1. Explain various evidences for organic evolution.

    2. Write a note on sex-liked inheritance.

  4. Write a note on sex-liked inheritance.

    1. H. G. Khorana

    2. Multiple alleles

    3. Reproductive isolation

    4. Agro bacterium mediated gene transfer

Section B

  1. Answer the following questions

    1. Discuss the relationship between osmotic pressure, turgor pressure and diffusion pressure deficit in a vacuolated plant cell.

    2. Write about the path of carbon in photosynthesis in the maize plant.

    3. What do you know about the centre of origin of wheat and the relatives of wheat?

    4. Write a note on the applications of plant growth regulations in agriculture.

  2. Describe the chemical nature of cytokining. Discuss in detail the various physiological effects of cytokinins.

  3. Answer the following questions

    1. How are long chain fatty acids synthesized in plant cells?

    2. What is agro forestry? What are its advantages?

  4. Answer the following questions

    1. Write critical notes on the following:

      1. Behaviour of guard cells during water stress

      2. Food chain and food web

    2. Write the botanical name, family, plant part form which it is obtained, and uses of the following:

      1. Vetiver oil

      2. Teak wood

      3. Reserpine

      4. Sesame oil