Which of the following fixes $CO_2$ in carbohydrates?

Which one does not differ between a $C_3$ and a $C_4$ plant?
$I.$ Initial $CO_2$ acceptor.
$II.$ Extent of photorespiration.
$III.$ Enzyme catalyzing reaction that fixes $CO_2$.
$IV.$ Presence of Calvin cycle.
$V.$ Leaf anatomy.

Which of the following processes is never affected by light in a vegetable garden?

The energy stored in glucose basically comes from

What is the quantum yield of photosynthesis (in $\%$)?

In which of the following is the rate of transpiration highest?