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What role does water play in the light reactions?

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Question: What role does water play in the light reactions?

Options:

  1. It absorbs light
  2. It provides electrons
  3. It fixes carbon
  4. It produces glucose

Correct Answer: It provides electrons

Solution: 

Water provides electrons through the process of photolysis during the light reactions.

What role does water play in the light reactions?

Practice Questions

Q1
What role does water play in the light reactions?
  1. It absorbs light
  2. It provides electrons
  3. It fixes carbon
  4. It produces glucose

Questions & Step-by-Step Solutions

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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