Which of the following is associated with photophosphorylation?

The energy required to hydrolyse water during photosynthesis comes from

In the photosynthesis process,which molecule acts as the reaction center?

In photosystem $II$, the reaction centre chlorophyll-a absorbs $A$ nm wavelength of red light, causing electrons to become excited and jump into an orbit farther from the atomic nucleus. These electrons are picked up by an $B$, which passes them to an electron transport system consisting of $C$. Pick the right choice for $A, B$ and $C$.

The process of $ATP$ synthesis in chloroplasts and mitochondria is explained by:

In photosynthesis, which phase involves the following phenomena?
$(I)$ Water is split $(photolysis)$
$(II)$ Oxygen is liberated
$(III)$ $NADPH$ is formed