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Why is only the outer layer of a stem green?

Updated: 8/17/2019
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15y ago

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Green comes from chlorophyll the photosensitive chemical in photosynthesis. It is only useful when there is light to exploit. There is no light inside the stem of the plant so there is no chlorophyll there.

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15y ago
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Q: Why is only the outer layer of a stem green?
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