IAS Mains Botany Papers 1996

IAS Mains Botany 1996

Paper-I

Section A

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

    1. Give an account of the role of microbes in industry.

    2. Describe the process of fertilization (from pollination to gametic fusion) in angiospermic plants.

    3. Describe the development of cyst carp in Rhodophyceae.

    4. Trace the evolutionary trends in the gametophytes in bryophytes.

  2. Answer the following questions

    1. Describe the life cycle of a blue green algae and discuss ite role in nitrogen economy of the soil. Why it is otherwise called as cyan bacterium?

    2. Give a general account of plant viruses, their ultra structure and mode of transmission.

    3. Describe the structure and discuss the morphological £nature of the spike of Ophioglossum.

  3. Give a concise account of the symptoms, disease cycle, life cycle of the causal organism and control measures of any four of the following:

    1. Powdery mildew of wheat

    2. Downy mildew of grapes

    3. Early blight of potato

    4. Bacterial blight of paddy

    5. Yellow vein mosaic of bhindi

  4. Answer the following questions

    1. Discuss the salient features in the life cycle of Coleochaete and their evolutionary significance.

    2. Describe the steps of dikar oxidation and development of basidium in Basidiomycetes.

    3. Write short notes on the following:

      1. Apothecium

      2. Elator

      3. Oogonial conceptacle of Focus

      4. Azolla

Section B

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

    1. Discuss the role of palynology in systematizes of flowering plants.

    2. Describe the development of typical dicot embryo.

    3. Discuss the role of hormones in cell differentiation.

    4. Give an account of the staminate strobilus in Gnetum upto the stage of pollen germination.

  2. Answer the following questions

    1. Describe anomalous secondary growth in the stems of

      1. Aristolochia

      2. Dracaena

    2. What is a natural system of classification of plants? Give the outline of Bentham and Hooker's system of classification justifying that it is a natural system.

    3. Describe the development of the male cone of pinus till the germination of pollen grain.

  3. Answer the following questions

    1. Give an account of the characteristic features of the family Asclepiadaceous along with floral diagram and floral formula. Give botanical names of three plants belonging to the family.

    2. What are haploid plants? How do they originate? What is their utility in crop improvement?

    3. Write brief notes on the following

      1. Periderm

      2. Helobial endosperm

      3. Protoplast

      4. Pinus needle

  4. Answer the following questions

    1. What is micro propagation? Describe various routes by which plants are micro propagated through tissue culture.

    2. Give an account of the family Arecacea (Palmae) with floral diagram and floral formula of any representative member. Give botanical names of five plants of the family having economic importance.

    3. Write short notes on the following:

      1. Flower of Hibiscus

      2. Female gametophyte of Gnetum

      3. Pollen embryo sac

    4. Give brief account of the following:

      1. Senescence

      2. Nucellus

      3. Interxylary phloem

      4. Coenospecies

      5. Embryo culture

Paper-II

Section A

  1. Answer any three of the following. Each part should be answered in not more than 200 words.

    1. Describe the sub-microscopic structure of a living plant cell. How does it differ from a prokaryotic cell?

    2. In modem concept of evolution, natural selection and mutation are not alternative but complementary processes-Explain.

    3. What are the forest types of India? Write the botanical names of 1. Redwood, 2. Hemp fibre, 3. Linseed, 4. Penicillium and 5. Rye.

    4. Explain the origin of nitrogenous compounds in the soil.

  2. In genetic language both divisions of meiosis are partly reductional and party equational-Explain.

  3. Distinguish between:

    1. Gynandromorphs and Intersexes

    2. Transductsion and Bacterial Transformation

    3. Deoxyribonucleic acid (DNA) and Ribonucleic acid (RNA)

    4. Forward mutation and Frame-shift mutation

  4. What is transpiration? Discuss its importance to plant biology. Is there any difference between transpiration and evaporation?

Section B

  1. Answer any three of the following. Each part should be answered in not more than 200 words.

    1. What do you know about the molecular aspects of enzyme synthesis and its regulation?

    2. How would you determine whether a particular trait was inherited via the nucleus or as cytoplasmic particle?

    3. What are biospheres? What are the commonest causes for endangering the survival of species? How are the endangered species conserved?

    4. What are the growth substances? Explain their importance in agriculture.

  2. What is pollution? What are the types of pollution? What are the principal means to check pollution?

  3. Write short notes on energy plantation and agrochemicals.

  4. What is genetic engineering? Discuss its importance to agriculture, forestry and medicine.