السؤال 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?

Because it has less water available inside its leaves
Because chlorophyll is the raw material that the reaction uses up
Because a pale leaf is always thinner than a green one
Because it cannot absorb as much of the light that falls on itالإجابة الصحيحة

الشرح

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.

الشرح

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