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A-Level Biology

Chlorophyll and Photosystems

In this video, we look at chlorophyll and photosystems. First we explore the role of chlorophyll in the absorption of light energy. We then look at how chlorophyll a forms a reaction centre and how accessory pigments form a light-harvesting system and how together they form a photosystem. Finally, we explore how light energy can lead to the formation of excited electrons and the process of photoionisation.