Question

Assertion: The first product of $CO_{2}$ fixation in $C_{3}$ pathway is $OAA$.
Reason :The first product of $CO_{2}$ fixation in $C_{4}$ pathway is $PGA$.

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (D)

The first product of $CO_{2}$ fixation in $C_{3}$ pathway is $3$-phosphoglyceric acid $(PGA)$ which is a $3$-carbon compound while the first product of $CO_{2}$ fixation in $C_{4}$ pathway is oxaloacetic acid $(OAA)$ which is a $4$-carbon compound.