How many molecules of water are needed by a green plant to produce one molecule of hexose or to reduce $6$ molecules of $CO_2$?

Give a comparison between the following:
$(a)$ $C_{3}$ and $C_{4}$ pathways
$(b)$ Cyclic and non-cyclic photophosphorylation
$(c)$ Anatomy of leaf in $C_{3}$ and $C_{4}$ plants

Photosynthesis is:
$I.$ Endergonic process
$II.$ Exergonic process
$III.$ Chemical process
$IV.$ Physical process
Select the correct option.

During photosynthesis,$ATP$ functions to transfer energy from:

Chloroplast fixes:

$P$: During the dark reaction of photosynthesis,ketotriose is synthesized.
$Q$: The sugar present in the structure of $ATP$ is an example of a ketopentose sugar.