Question

If photosynthesis proceeds for an hour in atmosphere with radioactive CO${}_2$, labelled carbon will be mostly found in

• A. Sugar
• B. Starch
• C. 3- phosphoglyceraldehyde
• D. All of the above

Answer 1

The correct option is D All of the above

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.