Photosynthesis Light Reaction
Asked by Vivek Ranganathan · 2 years ago
What happens during the light-dependent reactions of photosynthesis?
1 Answer
The light-dependent reactions of photosynthesis occur in the thylakoid membranes of chloroplasts. The process involves:
1. Light absorption: Chlorophyll and other pigments in photosystems capture light energy.
2. Electron excitation: Light energy excites electrons in photosystem II.
3. Electron transport chain: Excited electrons pass through a series of electron carriers.
4. ATP production: Energy from electron flow is used to pump protons, creating a gradient that drives ATP synthesis.
5. NADPH formation: Electrons are ultimately transferred to NADP+ to form NADPH.
6. Water splitting: Electrons lost from photosystem II are replaced by splitting water, releasing oxygen.
These reactions produce ATP and NADPH, which are then used in the Calvin cycle for carbon fixation.
1. Light absorption: Chlorophyll and other pigments in photosystems capture light energy.
2. Electron excitation: Light energy excites electrons in photosystem II.
3. Electron transport chain: Excited electrons pass through a series of electron carriers.
4. ATP production: Energy from electron flow is used to pump protons, creating a gradient that drives ATP synthesis.
5. NADPH formation: Electrons are ultimately transferred to NADP+ to form NADPH.
6. Water splitting: Electrons lost from photosystem II are replaced by splitting water, releasing oxygen.
These reactions produce ATP and NADPH, which are then used in the Calvin cycle for carbon fixation.
NEET Faculty · 2 years ago
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