The light dependent reation - photosynthesis
- Created by: holly2197
- Created on: 13-05-16 11:12
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- Light is absorbed by PS II
- Electrons in the chlorophyll molecule have more energy
- The electrons are omitted and passed onto electron carriers
- The loss of electrons causes the photolysis of water
- The water gives up its electrons to fill in the gap in PS II
- As the electron passes along the electron carrier, it begins to lose energy
- This means that energy is released and used to create ATP from ADP and P
- The electron eventually reaches PS I, where it replaces the electron lost when light gave electrons in the PS energy
- The electrons lost from PS I also go onto an electron carrier
- Here, the electrons combine with H+ ions to reduced NADP to NADPH
- This is called non-cyclic photophosphorylation
- If there is plenty of NADPH, then the electrons go back to the electron carriers used in PS II
- Here ATP is formed and the electron returns to PS I to fill the space, making PS II redundant and only PS I is in use
- This is called cyclic photophosphorylation
- Here ATP is formed and the electron returns to PS I to fill the space, making PS II redundant and only PS I is in use
- Here, the electrons combine with H+ ions to reduced NADP to NADPH
- The electrons lost from PS I also go onto an electron carrier
- The electron eventually reaches PS I, where it replaces the electron lost when light gave electrons in the PS energy
- This means that energy is released and used to create ATP from ADP and P
- The loss of electrons causes the photolysis of water
- The electrons are omitted and passed onto electron carriers
- The light dependent reaction
- Electrons in the chlorophyll molecule have more energy
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