What is true for photosynthesis $-$

For photosynthesis (i.e.,for synthesis of organic matter),the green plants need:

Which one of the following organisms does not evolve oxygen during photosynthesis?

Assertion $:-$ There is not a complete one-to-one overlap between the absorption spectrum of chlorophyll $a$ and the action spectrum of photosynthesis.
Reason $:$ Most of the photosynthesis takes place in the blue and red regions of the spectrum,but some photosynthesis does take place at the other wavelengths of the visible spectrum.

Choose the correct option:
$(1)$ The first product of the $C_3$ pathway in the Calvin cycle is $PGA / OAA$.
$(2)$ The primary acceptor of $CO_2$ in the $C_4$ pathway is $PEP / OAA$.

Identify the location and function of the following structures in a chloroplast:
$(1)$ Thylakoid
$(2)$ Stroma