Assertion: The first product of CO2 fixation in C3 pathway is OAA. Reason :The first product of CO2 fixation in C4 pathway is PGA.

Question

Assertion: The first product of CO2 fixation in C3 pathway is OAA. Reason :The first product of CO2 fixation in C4 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

Tardigrade Admin · Accepted Answer

The first product of CO2 fixation in C3 pathway is 3-phosphoglyceric acid (PGA) which is a 3-carbon compound while the first product of CO2 fixation in C4 pathway is oxaloacetic acid (OAA) which is a 4-carbon compound.

Q. Assertion: The first product of $C O_{2}$ fixation in $C_{3}$ pathway is $O AA$ .
Reason :The first product of $C O_{2}$ fixation in $C_{4}$ pathway is $PG A$ .

If both assertion and reason are true and reason is the correct explanation of assertion

If both assertion and reason are true but reason is not the correct explanation of assertion

If assertion is true but reason is false

If both assertion and reason are false

The first product of $C O_{2}$ fixation in $C_{3}$ pathway is $3$ -phosphoglyceric acid $(PG A)$ which is a $3$ -carbon compound while the first product of $C O_{2}$ fixation in $C_{4}$ pathway is oxaloacetic acid $(O AA)$ which is a $4$ -carbon compound.

Q. Assertion: The first product of CO2​ fixation in C3​ pathway is OAA. Reason :The first product of CO2​ fixation in C4​ pathway is PGA.