Question

First stable product of $C_4$/HSK photosynthesis is

• A. Phosphoglyceric acid
• B. Ribulose 1, 5-biphosphate
• C. Malic acid
• D. Phosphoglyceraldehyde.

Answer 1

The correct option is C Malic acid

C4 is the alternative pathway of Calvin cycle (C3 cycle) taking place during the dark phase of photosynthesis. In the C4 cycle the first stable compound is 4 carbon compound, namely oxaloacetic acid. Hence it is called C4 cycle. It is a process of carbon dioxide fixation.

So, the correct option is 'Oxaloacetic acid'.