Question

The acceptor of atmospheric CO$_2$ in C$_3$ plants is ______.

• A. RuBP and PEPA
• B. RuBP only
• C. PEPA only
• D. OAA or PEPA

Hint:

PEP is the CO$_2$ acceptor only in C$_4$ plants, not C$_3$.

Answer 1

The Correct Option is B

Step 1: Understanding C$_3$ pathway.
In C$_3$ plants, carbon fixation occurs through the Calvin cycle.
Step 2: CO$_2$ acceptor.
Ribulose-1,5-bisphosphate (RuBP) acts as the primary acceptor of atmospheric CO$_2$ in C$_3$ plants.
Step 3: Conclusion.
Therefore, the correct answer is RuBP only.