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Question 36

Two plants of the same kind are grown side by side in bright light and warm air, but one has much less chlorophyll in its leaves. Why does that one photosynthesise more slowly?

  1. Because it has less water available inside its leaves
  2. Because chlorophyll is the raw material that the reaction uses up
  3. Because a pale leaf is always thinner than a green one
  4. Because it cannot absorb as much of the light that falls on itCorrect answer

Explanation

The pigment is what captures light energy, so a leaf holding less of it collects less energy each second however brightly the lamp shines, and the quantity of pigment becomes the cap on the rate. The pigment is not consumed as the reaction runs, though, so treating it as a raw material that is being used up misreads its role.

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Question 36: Two plants of the same kind are grown side by side in… · Plants and Photosynthesis · Questena