Question

Differentiate between light reaction and dark reaction.

Answer 1

Answer:

Light reaction takes place in the day time with the presence of light.

Dark reaction takes place in the night time without the presence of light.

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Answer 2

Photosynthesis involves a series of complex photochemical reactions before the final products are obtained. It occurs in two stages. A part of of the reaction is dependent on light energy and one part proceeds independent of light. Accordingly the two stages are known as the light reaction (Light dependent phase) and the dark reaction (Light Independent phase).

$\huge\red{Light \:reaction :}$

⏺In this reaction, light energy is used to break up the water molecule.

⏺It is also known as Hill Reaction or photochemical phase.

⏺Release of molecular oxygen, production of energy -rich phosphates (ATP), and production of a reducing agent (NADPH2) for the reduction of carbon dioxide to glucose also occurs.

⏺The site of light reaction in the cell is in the grana of the chloroplast.

$\huge\red{Dark \:reaction :}$

⏺In this reaction, a complex cycle of reactions takes place.

⏺It is also known as biosynthetic phase or Calvin cycle.

⏺Conversion of carbon dioxide into glucose by using up the ATP and NADPH2 takes place.

⏺The site of light reaction in the cell is in the stroma of the chloroplast.