السؤال 120

Why does a seed buried in dark soil still need oxygen in order to germinate?

It respires, and respiration releases stored energyالإجابة الصحيحة
It needs oxygen for photosynthesis while it is underground
It uses oxygen to soften and split its seed coat
It does not need any oxygen while it is in the dark

الشرح

Releasing the energy locked up in the seed's reserve requires its cells to respire, and respiration in a seed consumes oxygen exactly as it does in any other living tissue. Photosynthesis is impossible in the dark and would release oxygen rather than use it up, so it cannot be the reason a buried seed fails without air.

الشرح

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