How many molecules of glycine are required to release one $CO_{2}$ molecule in photorespiration?

During photorespiration,in which organelle is $CO_2$ released?

Identify the incorrect match.

The process which makes a major difference between $C_3$ and $C_4$ plants is

The substrate for photorespiration is ......... .

Assertion : Under conditions of high light intensity and limited $CO_2$ supply,photorespiration has a useful role in protecting the plants from photo-oxidative damage.
Reason : If enough $CO_2$ is not available to utilize light energy for carboxylation to proceed,the excess energy may not cause damage to plants.