Mechanism of Photosynthesis:

Photosynthesis occurs in two phases.

First Phase of Photosynthesis (Light Reactions):

During the first phase, light energy is captured and is used to make high-energy molecules (ATP and NADPH). These reactions, which are known as light reactions, take place on the thylakoid membranes of chloroplasts.

Second Phase of Photosynthesis (Dark Reactions):

During the second phase, carbon dioxide is reduced to make glucose. The energy in the form of ATP is utilized in this process and is then stored in the bonds of glucose. Since these reactions do not use light directly, they are known as dark reactions. The dark reactions take place in the stroma of the chloroplasts.