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Question

In C3 plants, the first stable product of photo synthesis during the dark reaction is:
  1. 3-phosphoglyceric acid
  2. Oxaloacetic acid
  3. Phosphoglyceraldehyde
  4. Malic acid


Solution

The correct option is A 3-phosphoglyceric acid
3-phosphoglyceric acid, is a 3 carbon compound that is first formed in the C3 cycle. It is then converted to glyceraldehyde-3-phosphate.
Oxaloacetic acid, is a 4 carbon compound that is  first formed in the C4 cycle. It is then converted to malic acid.

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