1. Tardigrade
  2. Question
  3. Biology
  4. The electrons, that are removed from photosystem-II and photosystem-I during z-scheme, must be replaced. This is achieved by electrons released

Q. The electrons, that are removed from photosystem-II and photosystem-I during z-scheme, must be replaced. This is achieved by electrons released

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Solution:

Photosystem II is associated with oxygen-evolving complex - that has 4 Mg ions, one calcium ion and one chlorine ion - that splits water molecules to 4H+ and O2. Hence photosystem II obtain electron by splitting of water.
Photosystem I gets an electron from photosystem II. This Z-scheme is also called cyclic photophosphorylation.