السؤال 59

A brightly lit leaf is releasing oxygen into the air. What becomes of the rest of the oxygen that the leaf makes?

All of it is released; none of it is used by the plant
It is stored in the air spaces until darkness falls
It is carried down to the roots and released into the soil
Some of it is used by the plant's own respirationالإجابة الصحيحة

الشرح

Respiration is running in the very cells that are making this gas, so part of the supply is consumed on the spot and only the surplus diffuses away. Assuming that the whole amount leaves the leaf untouched until dark rests on the belief that the two processes cannot run together, and a leaf has no store where a gas could be kept waiting.

الشرح

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