In photosynthesis,oxygen is liberated due to

Photosystem-$I$ $(PS-I)$ is associated with which of the following?

During chemiosmotic synthesis of $ATP$ in photosynthesis,

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 reaction centres for $PS-I$ and $PS-II$ are

Fluorescent chlorophyll '$a$' occurs in