By which process is $CO_2$ not added into the atmosphere?

The detectable end product of photosynthesis is

Consider the following statements.
$I.$ The portion of the spectrum between $300-500 \;nm$ is also referred to as Photosynthetically Active Radiation $(PAR)$.
$II.$ Magnesium,calcium and chloride ions play prominent roles in the photolysis of water.
$III.$ In cyclic photophosphorylation,oxygen is not released (as there is no photolysis of water) and $NADPH$ is also not produced.

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

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

Which of the following categories of photosynthetic plants has the lowest transpiration ratio $(TR)$?