Question
Explain cyclic photophosphorylation along with its pathway.
✓
Answer
- It occurs in the stroma lamellae.
- It involves only photosystem I (PS I).
- When the photons activate $\mathrm{P}_{700}$ (PS I), it emits a pair of electrons.
- These electrons with high potential energy are captured by a primary acceptor and are transported down an electron transport chain consisting of ferredoxin, plastoquinone, cytochrome complex and plastocyanin.
- At each step of electron transfer, the electrons losesome amount of energy.
- This energy is used to pump $\mathrm H^+$ across the thylakoid membrane.
- The energy liberated when the protons diffuse across the thylakoid membrane is used for the formation of ATP.
- The de-energised electrons come back to $\mathrm{P}_{700}$ and hence this process is called cyclic.
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