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Briana is studying a model of the light-dependent reactions of photosynthesis. The diagram shows a part of this model.

A ray of light strikes photosystem II. A chemical equation shows that 2 water molecules (H2O) break apart to release 4 hydrogen ions, an oxygen molecule, and 4 electrons.

Briana notices the electrons that the water molecules release. She asks, "Will the electrons build up in the chloroplast?" Which addition to the diagram would be most useful for answering Briana's question?

A. a wavy arrow that shows Photosystem I
B. an equation for the chemical reaction that forms water from hydrogen ions, electrons, and oxygen molecules
C. an arrow that shows the electrons moving through electron carriers, and received by NADP+
D. an equation for the chemical reaction that forms hydrogen gas from hydrogen ions and electrons

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Answer:

The correct answer to the Briana question is option A which is a wavy arrow that shows Photo system I.

Explanation:

  • Photosytem II is light depending system, which absorbs light energy and generates electrons and hydrogen and oxygen ions from the break down of water molecules.
  • While these electrons are the input for photosystem I which is light independent system.
  • NADP+ receive electron and hydrogen ions at the end of photosystem I, not at the end of photosystem II.




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