What role does water play in the light reactions?
Correct Answer: Water provides electrons through the process of photolysis during the light reactions.
- Step 1: Understand that light reactions occur in the chloroplasts of plant cells.
- Step 2: Know that light energy from the sun is absorbed by chlorophyll, a green pigment in plants.
- Step 3: Realize that this absorbed light energy is used to split water molecules (H2O) in a process called photolysis.
- Step 4: Learn that when water is split, it releases electrons, which are essential for the light reactions to continue.
- Step 5: Remember that these electrons help create energy-rich molecules (ATP and NADPH) that are used in the next stage of photosynthesis.
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