Electrons from excited chlorophyll molecules of photosystem $II$ are accepted first by

During the light reaction,electrons are transferred by the splitting of $H_2O$ through the $ETC$,which results in the reduction of:

The assimilatory power produced during the light reaction in green algae is:

The two-pigment system theory of photosynthesis was proposed by,or the concept of evidence for the existence of two photosystems in photosynthesis was given by:

The decrease in the yield of photosynthesis in the presence of red light becomes increased to normal when it is supplemented with blue light. This phenomenon is termed as

What happens when the proton gradient breaks down?