how accessory pigments prevent photo-oxidation of chlorophyll a?
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As light falls on chlorophyll a, it keeps on radiating electrons
⇒ chlorophyll a gets oxidised (removal of electron is termed oxidation)
Continuous oxidation damages the pigment.
• The lost electrons are compensated by electrons evolved during splitting of water in OEC (Oxygen Evolving Complex)
• But this is a slow process
• Thus the accessory pigments (or antennae complex) momentarily supply electrons to the reaction centre chlorophyll a till it gets electrons from water splitting in OEC.
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