In which region of the chloroplast does cyclic photophosphorylation primarily occur?

$ATP$ formation in photosynthesis is known as

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 chemiosmotic hypothesis for the synthesis of $ATP$ in chloroplasts and mitochondria is based on which of the following?

Where does the release of oxygen occur in the chloroplast?

How many total water molecules are required by green plants to reduce $6$ molecules of $CO_2$ into a hexose sugar?