What is light and dark reaction?

Asked by  | 28th Jul, 2008, 08:00: PM

Expert Answer:

These are the two stages of photosynthesis.

Light reaction is an energy trapping, photochemical reaction, taking place in the grana of chloroplast and resulting in the formation of ATP and NADPH2. During light reaction, chlorophyll absorbs energy, gets excited and releases a high energy electron which passes through a system of electron acceptors. During this electron transfer, energy is released in the form of ATP.

In dark reaction, CO2 is reduced to carbohydrates. This reaction takes place in stroma of chloroplasts. It is independent of light. Here, ATP and NADPH2 is utilized.

 

Answered by  | 29th Jul, 2008, 09:33: AM

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