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Question

Oxygen released during photosynthesis comes from

A
carbon dioxide
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B
glucose
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C
water
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D
chlorophyll
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Solution

The correct option is C water
Scientists incorporated the heavy isotope of oxygen in water molecule and found that the oxygen released during photosynthesis comes form water. The light energy is captured by chlorophyll in the plant leaves. This energy is used to split water apart in a process called photolysis to release oxygen.

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