Question

what is hill reaction?

Answer 1

When chloroplasts are exposed to light, there is reduction of an electron acceptor by the electrons and protons obtained from water, and release of oxygen. This reaction is termed as Hill's reaction.

Splitting Of Water

• The electrons being transferred in the photo-phosphorylation reactions are generated by the splitting of water.

• Water splitting complex is associated with PSII.

• Manganese, chlorine, etc., play an important role.

• The light-dependent splitting of water is called photolysis
  2H₂O → 4H⁺ + O₂ + 4e^−

• Electrons formed are used for replacing the electrons lost from P680.

• Oxygen is liberated as a byproduct of photosynthesis.

• Protons are used for the formation of reducing power NADP to NADPH⁺.