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WAEC Biology 2024 Question 22

Question 22

Photosynthesis and Plant Nutrition

The rate of photosynthesis decreases in a wilted herbaceous plant because the

  1. A.enzymes in the leaf were denatured.
  2. B.chlorophyll in the leaves was not broken down.
  3. C.amount of light reaching the plant was reduced.
  4. D.amount of carbon dioxide entering to the leaf decreased.
Show the answer and explanation

Answer: D (amount of carbon dioxide entering to the leaf decreased.)

Explanation

When a plant wilts its guard cells lose water and the stomata close, so less carbon dioxide enters the leaf.