Light is necessary during photosynthesis for

If $E$ is the Emerson effect,$x$ is the rate of oxygen production in a mixed beam of light,$y$ is the rate of $O_2$ production in low wavelength light (short wavelength),and $z$ is the rate of $O_2$ evolution in high wavelength red light,what will be the value of $E$?

The minerals involved in the photolysis of water are:
$I$ Manganese
$II$ Calcium
$III$ Magnesium
$IV$ Chloride

The $ATP$ase enzyme consists of
$I$. $F_{0}$
$II$. $F_{1}$
$III$. $F_{2}$
Select the correct option.

The first electron acceptor from an excited chlorophyll molecule of Photosystem-$II$ is .......

Where does the primary photochemical reaction occur in the chloroplast,or where do the light reactions of photosynthesis take place?