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.