IAS UPSC (CSE) Mains 2005: Botany

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Time Allowed: Three Hours Maximum Marks: 300

Candidates should attempt Questions 1 and 5 which are compulsory, and any THREE

of the remaining questions selecting at least ONE question from each Section.

Provide diagrams in the answer books, wherever necessary.


  1. Answer any three of the following (in not more than 200 words each): 20 × 3 = 60

    1. Differentiate between conjugation and transduction in Bacteria.

    2. Give an account of algae in food industry.

    3. Write in short about mycotoxins.

    4. Write about Bryophytes as indicators of mineral enrichment.

  2. Write about the following: 20 × 3 = 60

    1. Range of thallus organization in Marchantiales.

    2. Evolution of seed habit in Pteridophytes.

    3. Characteristic features of Pythium.

  3. Answer the following: 20 × 3 = 60 Androecia (no description).

  4. Write Notes on: 20 × 3 = 60

    1. Give in short an account of five pulse yielding crops.

    2. Differentiate between manoxylic and pycnoxylic wood, giving examples.

    3. Give the classification of angiosperms as proposed by Hutchinson. Discuss its merits and demerits.

    4. Write a critical note on somatic hybrid and cybrid.


  1. Answer any three of the following (in not more than 200 words each): 20 × 3 = 60

    1. Give the salient features of Cycadales.

    2. Explain secondary growth in dicotyledonous stem.

    3. Explain pollination in Cycas.

  2. How will you distinguish between the following pairs of families on the basis of important floral characters? comimportant

    1. Malvaceae and Brassicaceae

    2. Leguminosae and Solanaceae

  3. Give an account of the pollen grain formation in dicots and monocots. 60

  4. Write in short on the following:

    1. Draw well labeled diagram of V. T. s. Thallus of Anthoceros passing through

    2. Monoecious coenobium of Volvox.

    3. Description of, conidia formation in Aspergillus.

    4. Give a short account of any two plant fibres.



  1. Write notes on any THREE of the following in about 200 words each: 20 × 3 = 60

    1. Polytene Chromosome

    2. Signal Transduction

    3. Transgenic plants.

    4. Standard deviation.

  2. Describe in detail the ultrastructure of Golgi Complex and its function. 60

  3. Answer the following questions

    1. Describe properties of Genetic Code.

    2. Describe the role of RNA in origin and evolution. 60

  4. Define hybrid vigour. Describe anyone method of hybridization for crop improvement 60


  1. Write notes on any THREE of the following in about 200 words each: 20 × 3 = 60

    1. Non-cyclic photophosphorylation

    2. Nitrogenases

    3. Fruit-ripening

    4. Afforestation

  2. Define auxins. Describe their physiological response in plants.

  3. Define biogeochemical cycles. Describe N-cycle.

  4. Answer the following questions

    1. What do you know about Social Forestry?

    2. How would you measure the level of Air-Pollution?

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