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2021-05-16

What happens to electrons in light-dependent reactions?

What happens to electrons in light-dependent reactions?

During the light-dependent reactions, an electron that’s excited in PSII is passed down an electron transport chain to PSI (losing energy along the way). In PSI, the electron is excited again and passed down the second leg of the electron transport chain to a final electron acceptor.

What would happen if the electron transport system in the light-dependent reaction of photosynthesis?

If the electron transport system did not work, electrons from PSII would not be transferred to PSI. Ferredoxin would then have no electrons to transfer to NADP+ so NADPH would not be produced. This would also affect the light-independent reaction of photosynthesis because NADPH is needed in this reaction.

What happens in the light reactions?

The light reaction takes place in the thylakoid discs. There, water (H20) is oxidized, and oxygen (O2) is released. The electrons freed up from water are transfered to ATP and NADPH.

Which process in the light-dependent reactions result in the release of hydrogen ions electrons and oxygen?

Electron Transport Chain is the process in the light-dependent reactions results in the release of hydrogen ions, electrons, and oxygen.

What is Z Scheme Class 11?

The electron transport The electrons then are moved downhill to a molecule of energy-rich NADP+ and the addition of these electrons reduces NADP+ to NADPH + H+. The whole scheme of transfer of electrons is called the z-scheme, due to its characteristic shape.

What is photosystem Class 11?

A photosystem is a protein complex, a group of two or more proteins, that is essential for the photochemistry of photosynthesis. There are two photosystems, Photosystem I and Photosystem II. The photosystems are the protein structures in plant chloroplasts that absorb light energy.

How is ATP made during the light reactions?

The Light Reactions of Photosynthesis. Light is absorbed and the energy is used to drive electrons from water to generate NADPH and to drive protons across a membrane. These protons return through ATP synthase to make ATP.