For the process of photosynthesis,all except one of the following items are essential. Point out the exception.

Provide definitions/explanations for the following terms:
$(1)$ Dark reaction
$(2)$ Photophosphorylation

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

Assertion : Cyclic pathway of photosynthesis first appeared in some eubacterial species.
Reason : Oxygen started accumulating in the atmosphere after the non-cyclic pathway of photosynthesis evolved.

Match the following pairs:
$(A)$ Emerson effect $(a)$ $C_4$ cycle
$(B)$ Hill reaction $(b)$ Photolysis
$(C)$ Calvin cycle $(c)$ $C_3$ cycle
$(D)$ Hatch and Slack cycle $(d)$ Photosystem-$I$ and $II$

Choose the incorrect statement with respect to photosynthesis.