Question

RuBisCO shows oxygenase activity when concentration of

• A. CO${}_2$ is higher at enzyme site
• B. O${}_2$ is higher at enzyme site
• C. O${}_2$ is equal to concentration of CO${}_2$
• D. O${}_2$released by plant is zero

Answer 1

The correct option is B O${}_2$ is higher at enzyme site

Photorespiration takes place when concentration of O${}_2$ is high at enzyme site. Calvin cycle takes place when concentration of CO${}_2$ > O${}_2$.