chloebelleh
Answered

When light energy excites electrons in photosystem II, where do the electrons to replace them come from?

AATP
BPhotosystem I
CThe light energy
DSplit water molecules

Verified Answer :

mpanderla95

After the electrons have been excited with light energy in Photosystem II, the replacement electrons come from the splitting of water molecules D. I believe is the correct response.

Answer:

The correct answer is D. Split water molecules.

Several pigments absorb light energy from the sun and passes it to P680 reaction center of photo-system II.

It then uses this energy to split the molecule of water and passes the free electron to the electron carrier known as plastoquinone.

\(2H_{2}O\) →\(4H^{+} + 4e^{-} + O_{2}\)

The electron is then passed to phot-system I via cytochrome \(b_{6}f\).

The overall passage of electron in this electron transport chain can be summarized as:

\(H_{2}O\) → PS II → plastoquinone → cytochrome \(b_{6}f\) → PS I → NADP

Related Questions