Question

Refer to the given reaction.
RuBP + $O_2\underset{oxygenase}{\overset{RuBP}{\to }}$Phosphoglyceric acid + phosphoglycolic acid
It is the first reaction of

• A. $C_3$ pathway
• B. $C_4$ pathway
• C. $C_2$ pathway
• D. glycogen

Answer 1

The correct option is C $C_2$ pathway

At high temperature RuBisCO functions as oxygenase and instead of fixing $C{O}_2$ oxidises RuBP to produce a $3-C$ phosphoglyceric acid and a $2-C$ phosphoglycolate. This is the first reaction of photorespiration or $C_2$ cycle.

So the correct option is C.