Question

what is light reaction and dark reaction? Explain

Answer 1

light reaction is the photosynthesis which takes place in presence of Sunlight
light independent reaction (dark reaction ) is the photosynthesis which can take place in absence of light also

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Answer 2

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.