In photosynthesis,hydrogen is transferred from the light reaction to the dark reaction by:

In which of the following are Photosystem $I$ $(PS I)$ and Photosystem $II$ $(PS II)$ found?

Read the following four statements,$(i), (ii), (iii)$ and $(iv)$ and select the right option having both correct statements.
Statements:
$(i)$ $Z$ scheme of light reaction takes place in the presence of $PSI$ only.
$(ii)$ Only $PSI$ is functional in cyclic photophosphorylation.
$(iii)$ Cyclic photophosphorylation results in the synthesis of $ATP$ and $NADPH_2$.
$(iv)$ Stroma lamellae lack $PSII$ as well as $NADP$ reductase.

The byproduct of photosynthesis is .........

Photosystem-$II$ is found in .........

Photosynthesis is an oxidation-reduction process. In this process,the substance that gets oxidized is ......... .