Download SGBAU BSc 2019 Summer 5th Sem Botany Plant Physiology n Ecology Question Paper

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B.Sc. (Part—III) Semester—V Examination

BOTANY

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(Plant Physiology and Ecology)

Time : Three Hours] [Maximum Marks : 80

Note :—(1) There are SEVEN questions in all.

(2) Question No. 1 is compulsory and carries 8 marks.

(3) Question Nos. 2 to 7 carry equal marks.

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(4) Draw well labelled diagrams wherever necessary.

1. (a) Fill in the blanks :
   1. The first stable product in C₃ cycle is __________.
   2. The phenomenon of inducing flowering using chilling treatment is known as __________.
   3. __________ is edaphic factor in ecology.
   4. The movement that takes place in response to gravity is called as __________.

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   (b) Choose correct alternatives (MCQ) :
   1. CAM pathway was first time reported in :
      1. Cactaceae
      2. Fabaceae
      3. Araceae
      4. Crassulaceae

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   2. Presence of air chambers in internal structure of leaf and stem is character of :
      1. Hydrophytes
      2. Xerophytes
      3. Mesophytes
      4. Halophytes

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   3. The end product of glycolysis is :
      1. Oxalic acid
      2. Pyruvic acid
      3. Citric acid
      4. Fumaric acid

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   4. __________ is responsible for ripening of fruit.
      1. Auxin
      2. GA₃
      3. Cytokinins
      4. Ethylene

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   (c) Answer in one sentence each :
   1. Define respiratory quotient.
   2. Define phototropism.
   3. Define ecology.
   4. What is guttation ?

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2. Write short notes on :

   1. Osmosis
   2. Passive water absorption
   3. Types of Transpiration.

   OR

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   1. Plasmolysis
   2. Starch sugar hypothesis
   3. Carrier concept.

3. Give detail account of Calvin cycle. 12

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   OR

   Describe the account on Glycolysis 12

4. Comment on :

   1. Sources of N₂

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   2. Growth phases
   3. Applications of Auxins.

   OR

   1. Nitrate reductase
   2. Ethylene

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   3. Symbiotic N₂ fixation.

5. Comment on

   1. Concept of florigen
   2. Tropic movements

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   3. Response of plants to water stress.

   OR

   1. Vernalization
   2. Long day plants
   3. Response of plants to salinity stress

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6. Comment on

   1. Water as ecological factor
   2. Structure of atmosphere
   3. Anatomical adaptation of hydrophytes

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   OR

   1. Light as ecological factor
   2. Process of soil formation
   3. Morphological adaptation of xerophytes.

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7. Define ecosystem. Discuss structural components and functions in pond ecosystem. 12

   OR

   1. Hydrosere 6
   2. Natality and Mortality 6

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