What is Light Reaction?

Photosynthesis is the process by which autotrophic plants make their own food. Carbon dioxide, water, chlorophyll, and sunlight are the main factors required for this process to take place by the green plants.

Photosynthesis occurs in two steps: Light reaction and Dark Reaction.

  • Light Reaction – It is a light dependent reaction
  • Dark reaction – It is a light-independent reaction

Light reaction

The light reaction of light dependent reaction occurs in the chloroplast of the mesophyll cells of the leaves. The chloroplasts are double-membraned cell organelles that are comprised of stacked disc-like structures known as thylakoids. The pigment chlorophyll, which is required for the process, is present on the membrane of these thylakoids,, and this is where the light reaction occurs.

In the light reaction, we can write it down as the following reaction:

2H2O + 2NADP+ + 3ADP + 3Pi → O2 + 2NADPH + 3ATP

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