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

Read the following four statements ($a, b, c,$ and $d$) carefully and select the option that includes both correct statements.
$(A)$ The $Z$-scheme of light reaction occurs only in the presence of $PSI$.
$(B)$ Only $PSI$ is functional in cyclic photophosphorylation.
$(C)$ Cyclic photophosphorylation results in the synthesis of $ATP$ and $NADPH_2$.
$(D)$ Stroma lamellae lack both $PS-II$ and $NADP$ reductase $(FNR)$.

What is the unique process which has supported life on this planet?

The two pigment system theory of photosynthesis was proposed by

Which of the following evidence indicates that the oxygen released during photosynthesis is derived from water?

For the synthesis of one molecule of hexose,how many additional molecules of $ATP$ are required in $C_3$ and $C_4$ pathways,respectively,besides the $12$ molecules of $NADPH_2$?