Photosynthesis Question 68
68. In $C_3$ plants, the first stable product of photosynthesis during the dark reaction is
(a) Malic acid
(b) Oxaloacetic acid
(c) 3-phosphoglyceric acid
(d) Phosphoglyceraldehyde
Show Answer
Answer : c
Hints & Solution
(c) 3-phosphoglyceric acid, a 3 carbon compound is the first product formed in the $C_3$ cycle. It is then converted to glyceraldehyde 3-phosphate. Oxaloacetic acid, 4 carbon compound is the first product formed in $C_4$ cycle. It is then converted to malic acid.
