What are the electron sources for the two electron transport chains of the light

Question

What are the electron sources for the two electron transport chains of the light reactions (light and dark reactions)?

I think it is Photosynthesis I and II. This is from the study guide for my final exam coming up. Please help me be able to answer this question correctly. Is my answers correct? If not please provide an explaination with a correct answer. Thank You! What are the electron sources for the two electron transport chains of the light reactions (light and dark reactions)?

I think it is Photosynthesis I and II. This is from the study guide for my final exam coming up. Please help me be able to answer this question correctly. Is my answers correct? If not please provide an explaination with a correct answer. Thank You!

Explanation / Answer

Beginning in Photosystem II: the electrons are derived via photolysis from H2O. In short, Light energy hits pigment molecules found in the antenna complex (which is in the thylakoid membrane), and by resonance energy transfer, the light energy makes its way to the reaction center (which consists of special chlorophyll a molecules); from there, there is a water-splitting complex (Mn) that splits one molecule of water into 2 H+ and 1/2 O2, yielding 2 electrons which are donated to the P680 molecule (the acceptor). There are your electrons.

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