IAS Mains Botany Papers 1999

IAS Mains Botany 1999


Section A

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

    1. What is mycoplasma? How does it differ from a fungus? Describe the important mycoplasma diseases of plants and their methods of control.

    2. Write an account of different types of steles found in pteridophytes with the help of suitable diagrams. Arrange these steles in an evolutionary sequence.

    3. With the help of suitable diagrams describe in detail the reproductive organs found in Batrachospermum. Comment on the life cycle. How does the life cycle of Batrachospermum differ from that of Polysiphonia?

    4. Differentiate between the spore bearing organs of Anthoceros and Polytrichum. Draw neat labelled diagrams.

  2. Classification of the class. Phaeophyceae is based on various kinds of life cycles. Discuss. Make graphic representation of all types of life cycles.

  3. Answer the following questions

    1. Write an account of the role of microbes in environmental pollution management programmes.

    2. With the help of diagrams only describe the life history of Puccinia

  4. Distinguish between the following pairs giving suitable labelled diagrams: (any three)

    1. Carpogonium and Archegonium

    2. External morphology of Psilotum and Equisetum

    3. Desmids and Diatoms

    4. Liverworts and Mosses.

Section B

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

    1. Describe the anomalous secondary growth in three dicot stems. Draw labelled diagrams in each case.

    2. Give the methodology and applications of tissue culture technique.

    3. Describe the major stomatal types in plants.

    4. Describe the anatomy of root stem transition region with the help of suitable diagrams only.

  2. Write an account of the floral structure of the following families

    1. Euphorbiaceae

    2. Rubiaceae

    3. Orchidaceae

    Give botanical names of three important plant species belonging to each of the three familities.

    Specify why these are important.

  3. Give an account of the vegetative anatomy of Cycas with the help of diagrams. Enumerate important differences in the anatomical features of Cycas and Gnetum (only vegetative features).

  4. Answer the following questions

    1. What is polynology? Describe the basic and applied importance of this science.

    2. Enumerate various types of angiospermic embryo sacs in a tabular form.


Section A

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

    1. Cellular function of oncoproteins

    2. Photochemical smog

    3. Physiological role of essential elements in plants

    4. Genetic basis of inbreeding depression and heterosis

  2. How does mutation contribute to organic evolution? What modifications in mutation theory of Hugo de Varies were found necessary to reach the present state of our knowledge?

  3. Distinguish between the following:

    1. Linkage map and Linkage group

    2. Physical xerophytes and Physiological xerophytes

    3. Euromatin and Heteromatin

    4. Photo-system-I and Photo-system-II

  4. What is population? Discuss the genetic forces that disturb the genetic equilibrium and modify the gene frequencies in population.

Section B

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

    1. TCA-an amphibole pathway

    2. Atmosphere is an essential life supporting system

    3. An organism is a bundle of adaptation

    4. Bio-fertilizers improve soil fertility

  2. What is ‘Bioenergy’ Explain the energy cycle in the cells. What is the role of ATP in this cycle?

  3. Write short notes on any three of the following

    1. Ageing and senescence

    2. Cell cycle

    3. Neurospora for genetic research

    4. New genetic code

  4. Listed below are a few economic plants. Briefly point out the morphology of useful part, economic products and uses

    1. Holorrhena antidycentrica

    2. Allium sativa

    3. Chrysanthemum cinerarifolium

    4. Pinus genadiana

    5. Cannabis sativa

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