AP BIOLOGY

Detailed explanation-1: -Photophosphorylation is the process in which light energy is converted into chemical energy through the production of ATP. It is the process of formation of ATP from ADP and inorganic phosphate (IP) utilizing light energy. It occurs in grana of chloroplast during photosynthesis.

Detailed explanation-2: -The process by which ATP is synthesised by cells (in mitochondria chloroplasts) is named as phosphorylation. Photophosphorylation is the synthesis of ATP from ADP and inorganic phosphate (Pi) in the presence of light, inside chloroplast.

Detailed explanation-3: -Photophosphorylation is the conversion of ADP to ATP using the energy of sunlight by activation of PSII. This involves the splitting of the water molecule in oxygen and hydrogen protons (H+), a process known as photolysis. Subsequently, a continuous unidirectional flow of electron from water to PSI is performed (Fig.

Detailed explanation-4: -In eukaryotes, oxidative phosphorylation occurs in mitochondria, while photophosphorylation occurs in chloroplasts to produce ATP.

Detailed explanation-5: -During the light reaction of photosynthesis, phosphorylation occurs, wherein inorganic phosphate is added to ADP and results in the formation of ATP. Since this process utilises light energy, it is called photophosphorylation.