During photorespiration,where does the consumption of $O_2$ occur in the processes?

Which process does not occur in $C_4$ plants?

In $C_{3}$ plants,when $O_{2}$ concentration is high,$O_{2}$ binds to $Rubisco$ and $RuBP$ is converted into:

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

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

Given below are two statements:
Statement $I$: In $C_3$ plants,some $O_2$ binds to $RuBisCO$,hence $CO_2$ fixation is decreased.
Statement $II$: In $C_4$ plants,mesophyll cells show very little photorespiration while bundle sheath cells do not show photorespiration.
In the light of the above statements,choose the correct answer from the options given below: