Question

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

Answer 1

Answer: (C)

3-phosphoglyceric acid

Answer 2

In ${{C}_{3}}$ plants the first stable product formed during dark reaction is $3$-phosphoglyceric acid. Since it is a $3$- carbon compound hence, the pathway is referred as ${{C}_{3}}$ pathway. Oxaloacetic acid (OAA) is the first stable compound in ${{C}_{4}}$ plants. It is a $4C$ compound.