CPH–201 Plant Physiology Question Paper for Agriculture

UNIVERSITY OF AGRICULTURAL SCIENCES, DHARWAD

College of Agriculture, RAICHUR

FINAL EXAMINATION QUESTION PAPER

Course Code: CPH–201
Course Title: Plant Physiology

Marks: 50
Time: 2:30 hrs

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Part – I (a) Underline the correct answer

(10 × 0.5 = 5.0)

1. Photolysis of water takes place in
   a) Stroma
   b) Grana
   c) Vesicles
   d) Mitochondria

2. Hexose sugars consist of
   a) 3C
   b) 6C
   c) 5C
   d) 4C

3. The pigment responsible for seed germination is
   a) Chlorophyll
   b) Xanthophyll
   c) Phytochrome
   d) Anthocyanin

4. Hormone involved in cell division and cell expansion is
   a) Auxin
   b) GA
   c) Cytokinin
   d) Ethylene

5. Plants absorb water from the soil mainly by
   a) Diffusion
   b) Osmosis
   c) Plasmolysis
   d) Hydration

6. An example of CAM plant is
   a) Apple
   b) Citrus
   c) Pineapple
   d) Mango

7. Water potential of normal turgid plant is
   a) –0.3 bars
   b) –2 bars
   c) –4 bars
   d) –6 bars

8. The key enzyme involved during carboxylation of RuBP to PGA is
   a) PEP carboxylase
   b) RuBisCO
   c) Carbonic anhydrase
   d) Malic enzyme

9. Cytokinins are synthesized primarily in
   a) Roots
   b) Shoot tips
   c) Young flower buds
   d) Leaves

10. Herbicide used to control dicot weeds is
    a) 2,4-D
    b) Glyphosate
    c) Paraquat
    d) Both b and c

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Q.II Answer the following in one or two sentences only

(15 × 1.0 = 15.0)

A. Define the following (any five)

(5 × 1.0 = 5.0)

1. Crop Physiology

2. Drought resistance

3. Growth

4. WUE (Water Use Efficiency)

5. Morphogenesis

6. RGR (Relative Growth Rate)

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B. State TRUE or FALSE and correct the FALSE statement (any five)

(5 × 1.0 = 5.0)

1. Oxygen evolved during photosynthesis comes from CO₂

2. Movement of plant organs in response to direction of light is called photoperiodism

3. During log phase growth is very slow

4. Failure of viable seeds to germinate is due to dormancy

5. Sunflower is a long day plant

6. Outer wall of the guard cell is thicker than inner wall

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C. Differentiate the following (any five)

(5 × 1.0 = 5.0)

1. Short day and long day plants

2. Photosynthesis and respiration

3. Transpiration and guttation

4. Source and sink

5. Auxins and Gibberellins

6. Dark and light phase of photosynthesis

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Q.III Briefly answer the following questions (any five)

(5 × 2 = 10.0)

1. Briefly explain the physiological role of auxins

2. Write a short note on significance of transpiration to plants

3. Plant fail to grow in highly saline fields. Justify the statement

4. Briefly explain the morphological and physiological changes associated with physiological maturity in crop

5. Define respiration and give a brief account of growth respiration and maintenance respiration

6. Briefly explain the physiology of nutrient uptake

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Q.IV Explain the following questions in detail (any five)

(5 × 3 = 15.0)

1. What is photophosphorylation? Explain the mechanism of non-cyclic photophosphorylation with suitable schematic diagram

2. State the types of transpiration and explain the mechanism of opening and closing of stomata

3. Classify the plant nutrients and describe the functions and deficiency symptoms of potassium and zinc in plant nutrition

4. Define the term plant growth regulators and explain their commercial applications

5. Define respiration and explain in detail glycolysis process

6. Define water potential and explain various components of water potential

7. Describe in detail the biochemical reactions of Kreb’s cycle

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