Explanation:

Photophosphorylation is a process that refers to the utilization of sunlight energy from photosynthesis to convert ADP (adenosine diphosphate) to ATP (adenosine triphosphate). It synthesizes ATP by transferring the inorganic phosphate group to ADP in the presence of light energy. Hence, the name photo, which means light, and phosphorylation, which means the addition of a phosphate group.

Photophosphorylation is a light-dependent reaction that occurs in the chloroplasts. Chlorophyll is a pigment in the chloroplast that absorbs light. Photophosphorylation is of two types cyclic and non-cyclic photophosphorylation.

For Cyclic photophosphorylation,

Requirements:

Light energy, Photosystem (PS) I-P700 (active center), and Chain of electron acceptors.

Major event:

From the electron transport chain, electrons are transferred back and downwards to PS I, which results in the formation of ATP

Products:

ATP only

For Non-Cyclic photophosphorylation,

Requirements:

Light energy, PS I-P700, PS II-P680 (active center), chain of electron acceptor, and water

Major event:

Photooxidation of water to produce protons that generates proton motive force to synthesize ATP. Protons are finally transferred to NADP+

Products:

ATP and NADPH (Reduced nicotinamide adenine dinucleotide phosphate)

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