Question
Describe the light harvesting complexes of photosystems.
✓
Answer
- The light harvesting complexes are aggregates of pigments organised within photosystem I and photosystem II.
- Each LHC is made up of hundreds of pigment molecules bound to certain proteins.
- In each LHC, one molecule of chlorophyll a forms the reaction centre, where the actual light reactions take place, while the other pigment molecules of the complex form the antennae; they absorb light at different wavelengths and pass it on to the reaction centre, to make the process more efficient.
- In PS I, the reaction centre is $P_{700}$ which is a chlorophyll a molecule that has an absorption peak at 700 nm and in PS II, the reaction centre is PO which is a chlorophyll a molecule with an absorption peak at 680 nm.
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