difference between light reactions and dark reactions
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Answer:
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Light reaction and dark reaction are the two types of sequential processes that occur during the photosynthesis of plants. Light reaction occurs in the thylakoid membrane of chloroplast whereas the dark reaction occurs in the stroma of the chloroplast. Light energy from sunlight is trapped by chlorophylls during the light reaction of the photosynthesis. Dark reaction is catalyzed by various enzymes. The main difference between light and dark reaction is that light reaction is the first stage of photosynthesis, which traps light energy in order to produce ATP and NADPH whereas dark reaction Difference Between Light and Dark Reaction
Occurs in
Light Reaction: Light reaction occurs in the thylakoid membrane of the chloroplast.
Dark Reaction: Dark reaction occurs in the stroma of the chloroplast.
Light
Light Reaction: Light reaction depends on the sunlight.
Dark Reaction: Dark reaction is independent of sunlight.
Pigments
Light Reaction: Chlorophylls are the pigments involved in the light reaction.
Dark Reaction: No pigments are involved in the dark reaction.
Photolysis
Light Reaction: Photolysis occurs in PS II during the light reaction.
Dark Reaction: No photolysis occurs during the dark reaction.
Oxygen/Carbon dioxide
Light Reaction: Oxygen is liberated during the light reaction.
Dark Reaction: Carbon dioxide is fixed during the dark reaction.
Results
Light Reaction: ATP and NADPH are produced during the light reaction.
Dark Reaction: Glucose is produced by using the energy from ATP and NADPH, produced in the light reaction.
Conclusion
Light reaction and dark reaction are the two steps of reactions involved in photosynthesis. Light reaction occurs in the thylakoid membrane of chloroplasts. The energy of sunlight is trapped by chlorophylls, and the trapped energy is used in the production of ATP and NADPH. These ATP and NADPH are used in the production of glucose in the dark reaction. The dark reaction occurs in the stroma of chloroplast with the involvement of enzymes. It occurs in two ways, C3 cycle and C4 cycle. C4 cycle is more efficient than C3 cycle. The main difference between light and dark reaction is their contribution to photosynthesis.
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