Write a short note on light and dark reactions.
Write a short note on light and dark reactions.
The process of photosynthesis occurs in two phases – the light reactions and the dark reactions.
Light reactions – As the name suggests, this reaction takes place in the presence of light. Light energy is absorbed by chlorophyll molecules and is utilized for splitting water molecules into hydrogen and oxygen. Additionally in this phase, assimilatory power in the form of ATP and NADPH2 are produced.
Light reactions occur in the membranes of thylakoids.
Events occurring during light reactions:
Absorption of light energy by chlorophyll molecules
Splitting of water molecules into hydrogen and oxygen atoms
Formation of ATP and NADPH2
Dark reactions – This reaction does not require direct light and occurs in the stroma of chloroplasts. During this phase, ATP and NADPH2 (formed during light reactions) are utilized for the reduction of CO2 to carbohydrates (food).
Event occurring during dark reaction:
Reduction of CO2 to form carbohydrates
Further detail is beyond the scope of your syllabus considering your grade.
The process of photosynthesis occurs in two phases – the light reactions and the dark reactions.
Light reactions – As the name suggests, this reaction takes place in the presence of light. Light energy is absorbed by chlorophyll molecules and is utilized for splitting water molecules into hydrogen and oxygen. Additionally in this phase, assimilatory power in the form of ATP and NADPH2 are produced.
Light reactions occur in the membranes of thylakoids.
Events occurring during light reactions:
Absorption of light energy by chlorophyll molecules
Splitting of water molecules into hydrogen and oxygen atoms
Formation of ATP and NADPH2
Dark reactions – This reaction does not require direct light and occurs in the stroma of chloroplasts. During this phase, ATP and NADPH2 (formed during light reactions) are utilized for the reduction of CO2 to carbohydrates (food).
Event occurring during dark reaction:
Reduction of CO2 to form carbohydrates
Further detail is beyond the scope of your syllabus considering your grade.
