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

A. ATP
B. Photosystem I
C. The light energy
D. Split water molecules

Respuesta :

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.

[tex]2H_{2}O[/tex] →[tex]4H^{+} + 4e^{-} + O_{2}[/tex]

The electron is then passed to phot-system I via cytochrome [tex]b_{6}f[/tex].

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

[tex]H_{2}O[/tex] → PS II → plastoquinone → cytochrome [tex]b_{6}f[/tex] → PS I → NADP

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