Question

If photosynthesis proceeds for an hour in atmosphere with radioactive CO, labelled carbon will be mostly found in 

A

Sugar

B

Starch

C

3- phosphoglyceraldehyde

D

All of the above

Hard
Solution
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Correct option is D)

During photosynthesis, atmospheric carbon dioxide will be consumed by the plant, which can be used as carbon source for synthesis of both starch and sugars. As, 3- phosphoglyceraldehyde is the intermediate for synthesis of starch or sugar, labelled carbon also present in 3- phosphoglyceraldehyde. Thus, labelled carbon will be found in sugar, 3- phosphogleceraldehyde and starch.
So, the correct answer is option D.

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