Question

What do you mean by light reaction and dark reaction during photosynthesis ? Explain in detail.

Answer 1

hey here's Ur answer...

Light reaction need light to produce organic energy molecules (ATP and NADPH). They are initiated by colored pigments, mainly green colored chlorophylls.

Dark reaction 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. ATP provides the energy while NADPH provides the electrons required to fix the CO2 (carbon dioxide) into carbohydrates. 

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Answer 2

Light reaction is the conversion of solar energy into ATP and NADPH in thylakoid and it's a light driven reaction
Dark reaction is the conversion of carbon dioxide to glucose by the utilisation of ATP & NADPH in stroma and is a light independent reaction