What are light and dark reactions in photosynthesis ?
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Photosynthesis is the process of conversion of light energy into chemical energy which can then be utilized by living organisms. It is a rather complex process which is carried out through various stages.
Photosynthesis comprises two phases:
The first phase is the photochemical phase or light-dependent process. This phase is commonly known as the light reaction.
The second phase is the biosynthetic phase of the dark reaction of photosynthesis. This phase is the light-independent process
Light Reaction and Dark Reaction
As stated above, photosynthesis occurs in two phases – light reaction and dark reaction.
Light Reaction
The light reaction is a light-dependent process which includes a series of events such as light absorption, hydrolysis, the release of oxygen, formation of ATP and NADPH.
The light reaction of photosynthesis initiates only when it is supplied with light energy.
The photosystem is the arrangement of pigments, including chlorophyll within thylakoids.
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