What happens to the electrons in all chlorophyll molecules of PSII and PSI when light is absorbed?

What happens to the electrons in all chlorophyll molecules of PSII and PSI when light is absorbed?

Light that is harvested from PSII causes an excited electron of the chlorophyll a special pair to be passed down an electron transport chain (Pq, Cyt, and Pc) to PSI. The electron lost from the chlorophyll a special pair is replenished by splitting water.

Does PSI have chlorophyll?

Oxygenic photosynthesis is driven by photosystems I (PSI) and II (PSII). In plants the number of chlorophylls of PSI versus PSII is adjusted to the light irradiance spectrum. Thus far very diverse values have been reported for the PSI/PSII chlorophyll ratio, ranging from 0.54 to 1.4.

How is P680 regenerated?

P680 electrons are replenished by the water that has been absorbed by the plant roots and transported to the chloroplasts in the leaves. The movement of electrons in Photosystems I and II and the action of an enzyme split the water into oxygen, hydrogen ions, and electrons.

How the loss of electron is recovered by both PSII and PSI explain?

During the light reactions of photosynthesis, photosystem II reaction centre P680 absorbs light to boost its electrons and attains oxidized state. To reduce the oxidized chlorophyll molecules or to regain the lost electrons, the source of electrons is water in green plants and cyanobacteria.

Who proposed Z-scheme of light reaction?

Question : The z’ scheme of photosynthesis was proposed by. by Biology experts to help you in doubts & scoring excellent marks in Class 11 exams. This non-cyclic photophosphorylation is also known as Z-scheme (because of shape of path of electron-flow) and this was given by Hill and bendall (1960).

How is NADP made?

NADP+ is created in anabolic reactions, or reaction that build large molecules from small molecules. NADPH donates the hydrogen (H) and associated electrons, oxidizing the molecule to create NADP+.

What is the role of NAD?

The cellular respiration processes of all living cells make use of the coenzyme Nicotinamide adenine dinucleotide (NAD). It plays a key role in energy metabolism by accepting and donating electrons. It accepts two electrons and a hydrogen in reaching the high energy state. …

Is NADP an electron acceptor?

The final electron acceptor is NADP. In oxygenic photosynthesis, the first electron donor is water, creating oxygen as a waste product. In non-cyclic photophosphorylation, cytochrome b6f uses the energy of electrons from PSII to pump protons from the stroma to the lumen.

What is the final electron acceptor in Photophosphorylation?

The final electron acceptor is NADP. In cyclic photophosphorylation, cytochrome b6f uses the energy of electrons from not only PSII but also PSI to create more ATP and to stop the production of NADPH.