Transpiration: Factors and Mechanism · NCERT Biology

The evolution of the C4 photosynthetic system is probably a strategy to:

  1. Increase water loss to cool the plant down
  2. Fix more carbon while losing less water overall
  3. Enable plants to survive in waterlogged conditions
  4. Eliminate the need for stomatal openings entirely
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Correct answer: Fix more carbon while losing less water overall

C4 plants are roughly twice as efficient as C3 plants at fixing carbon for the same amount of water lost. This is an adaptation that maximizes photosynthetic yield while minimizing water loss in hot, water-stressed environments.

Difficulty: Medium Question 12 of 20

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