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In photosystem II, the electron lost by the reaction center is replaced by splitting:

AWater
BStarch
CLipids
DSugars
Answer & Solution
Correct answer: A. Water
1. Splitting water releases oxygen. 2. Water is the electron source for PSII. 3. PSI gets electrons from the transport chain. _Source: OpenStax Biology 2e, Chapter 8, Photosynthesis (CC BY 4.0)._
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