CSIR NET Life Science Unit 6 MCQs with Answers

Here below are 15 core System Physiology – Plant topics across five parts. Choose Easy, Medium or Difficult for each topic to practise 15 questions per level. Answers show the correct option and explanation immediately.

Part 1: Topics 1–3

1. Water Potential and Osmosis

15 questions per level · Select Easy, Medium or Difficult

2. Mineral Nutrition and Ion Uptake

15 questions per level · Select Easy, Medium or Difficult

3. Xylem Transport and Transpiration

15 questions per level · Select Easy, Medium or Difficult

Part 2: Topics 4–6

4. Phloem Transport and Source–Sink Relations

15 questions per level · Select Easy, Medium or Difficult

5. Photosynthetic Pigments and Light Reactions

15 questions per level · Select Easy, Medium or Difficult

6. Calvin Cycle and Carbon Fixation

15 questions per level · Select Easy, Medium or Difficult

Part 3: Topics 7–9

7. C4 and CAM Photosynthesis

15 questions per level · Select Easy, Medium or Difficult

8. Photorespiration and Photosynthetic Regulation

15 questions per level · Select Easy, Medium or Difficult

9. Plant Respiration and Energy Metabolism

15 questions per level · Select Easy, Medium or Difficult

Part 4: Topics 10–12

10. Plant Growth Regulators: Auxin and Gibberellin

15 questions per level · Select Easy, Medium or Difficult

11. Plant Growth Regulators: ABA, Ethylene and Cytokinins

15 questions per level · Select Easy, Medium or Difficult

12. Photomorphogenesis and Light Signaling

15 questions per level · Select Easy, Medium or Difficult

Part 5: Topics 13–15

13. Flowering, Photoperiodism and Vernalization

15 questions per level · Select Easy, Medium or Difficult

14. Plant Stress Physiology and Defense

15 questions per level · Select Easy, Medium or Difficult

15. Seed Germination, Senescence and Plant Development

15 questions per level · Select Easy, Medium or Difficult

Frequently Asked Questions

What drives water movement through xylem?

Transpiration-generated tension, cohesion between water molecules and adhesion to xylem walls support upward transport.

How does phloem transport differ from xylem transport?

Phloem distributes sugars and other solutes from sources to sinks, while xylem chiefly transports water and minerals.

Why is photorespiration more common in hot, dry conditions?

Stomatal closure can lower internal CO2 relative to O2, favoring Rubisco oxygenase activity.

What is the role of abscisic acid during drought?

ABA promotes stomatal closure and coordinates several water-stress responses.

How do C4 plants reduce photorespiration?

They initially fix carbon through PEP carboxylase and concentrate CO2 near Rubisco.

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