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Photosynthesis in Higher Plants
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Light Reactions and Photosystems
PS II (P680) + lightExcited electrons
Photosystem II absorbs light, exciting electrons.
Terms:
PS II
Photosystem II
P680
Chlorophyll a in PS II with peak absorption at 680 nm
PS I (P700) + lightExcited electrons
Photosystem I absorbs light, exciting electrons.
Terms:
PS I
Photosystem I
P700
Chlorophyll a in PS I with peak absorption at 700 nm
The light reactions involve the absorption of light by chlorophyll and the excitation of electrons in Photosystem II (PS II) and Photosystem I (PS I). These electrons are transferred through an electron transport chain, leading to the production of ATP and NADPH.
Common Use:
Understanding the initial steps of photosynthesis and the role of light in energy capture.
Light Reactions
Photosynthesis
Photosystems
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