Question

difference between light reaction and phtolysis?
And also what is light reaction and dark reaction?​

Answer 1

Answer:

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.

The whole process of photosynthesis takes place within the chloroplast.

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.

There are two photosystems in plants:

Photosystem I (PS-I)

Photosystem II (PS-II)

Light Reaction:

“Light reaction is the process of photosynthesis that converts energy from the sun into chemical energy in the form of NADPH and ATP.”

Dark Reaction:

Dark reaction is also called carbon-fixing reaction. It is a light-independent process in which sugar molecules are formed from the carbon dioxide and water molecules. The dark reaction occurs in the stroma of the chloroplast, where they utilize the products of the light reaction.

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Answer 2

It occurs in the stroma of the chloroplast. Photolysis occurs in Photosystem II. Photolysis occurs in Photosystem I. It involves the absorption of light energy and its conversion into chemical energy in the form of ATP and NADPH and hydrogen ions.
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