Question

What is light a and dark reaction in photosynthesis?

Answer 1

Light reactions need light to produce organic energy molecules (ATP and NADPH). They are initiated by colored pigments, mainly green colored chlorophylls. Dark reactions make use of these organic energy molecules (ATP and NADPH). This reaction cycle is also called Calvin Benison Cycle, and it occurs in the stroma.

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Answer 2

Photosynthesis occurs in two steps: light reaction and dark reaction. Light reaction occurs in grana and dark reaction occurs in stroma.

Light reaction: chlorophyll absorbs light emits electrons as water is splitted into oxygen and hydrogen .

The elecrtrons and protons released by the photolysis of water are used up in the production of NADPH and ATP.

Dark reaction: The biochemical reactions occuring one after the other in the form of cycle utilising NADPH and ATP to convert carbon dioxide into carbohydrate is called dark reaction.

The overall equation is as follows:

6co2 + 6rubp + 18ATP + 12NADPH ------- C6H12o6 + 6rubp + 18adp + 18pi + 12NADP + .