Question

Which substance acts as hydrogen acceptor in plants when photolysis of water takes place?

Answer 1

• Nicotinamide adenine dinucleotide phosphate abbreviated NADP.

The four photosystems absorb light energy through pigment primarily the chlorophylls, which are responsible for the green color of leaves.

• The light-dependent reactions begin in photosystem II. When a chlorophyll a molecule within the reaction center of PSII absorbs a photon, an electron in this molecule attains a higher energy level.
• Because this state of an electron is very unstable, the electron is transferred from one to another molecule creating a chain of redox reactions, called an electron transport chain (ETC). The electron flow goes from PSII to cytochrome b${}_6$f to PSI. In PSI, the electron gets the energy from another photon. The final electron acceptor is NADP.