Question

briefly explain the term photophosphorylation

Answer 1

Phosphorylation: the synthesis of ATP from ADP and phosphate that occurs in a plant using radiant energy absorbed during photosynthesis.

Answer 2

Photophosphorylation happens with the help of photosynthesis, a process of producing carbohydrates by green plants using carbon dioxide and water in the presence of sunlight. The two-step process comprises of:

The light reaction which takes place in the grana of the chloroplast where light energy gets converted to chemical energy as ATP and NADPH. In this reaction, the addition of phosphate in the presence of light or the synthesizing of ATP by cells is known as photophosphorylation.

While in the dark reaction, the energy produced previously in the light reaction is utilized to fix carbon dioxide to carbohydrates. The location where this happens is the stroma of the chloroplast.

When plants use light energy from photosynthesis to convert ADP to ATP, the process is known as Photophosphorylation.

There are two types of photophosphorylation –

1) Cyclic Photophosphorylation

2) Non – cyclic Photophosphorylation