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NEETBotanyPhotosynthesis in Higher Plants

What is the direct effect of water stress on CO2 availability?

Options

  1. AIncreases CO2 availability
  2. BDecreases CO2 availability
  3. CHas no effect on CO2 availability
  4. DConverts CO2 to O2

Correct answer

B. Decreases CO2 availability

Step-by-step solution

Even though water is one of the reactants in the light reaction, the effect of water as a factor is more through its effect on the plant, rather than directly on photosynthesis. Water stress causes the stomata to close hence reducing the CO2 availability. Besides, water stress also makes leaves wilt, thus, reducing the surface area of the leaves and their metabolic activity as well.

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