Question

Whether photorespiration is present at low co2 concentrations in c3 and c4 plants

Answer 1

In C3 plants photo respiration occurs at low CO2 concentration
In C4 plants photo respiration never occurs.

Answer 2

Whether photorespiration would be introduced at HIGH $CO_{2}$ concentration in C3 sometimes in C4 negligible (high/ negligible / sometimes) temperature optimum in c3 it would be $20^\circ -25^\circ C$ in that it would be c4 $30^\circ - 40^\circ C$ .

Explanation:

• Photorespiration appears in C3 plants when the $CO_{2}$ concentration drops to about 50 ppm.
• But during hot and dry conditions, the stomata close to block excessive water loss and the enduring fixation of carbon in the Calvin cycle dramatically lower the relative concentration of $CO_{2}$.

To know more:

What is photo respiration ?

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