Which molecule acts as the primary electron donor in the light reactions?

Which molecule acts as the primary electron donor in the light reactions?

Correct Answer: Water

Step 1: Understand that light reactions are part of photosynthesis, which occurs in plants.
Step 2: Know that light reactions take place in the thylakoid membranes of chloroplasts.
Step 3: Identify that during light reactions, sunlight is absorbed by chlorophyll.
Step 4: Recognize that this absorbed sunlight energy is used to split water molecules.
Step 5: Realize that when water is split, it releases electrons.
Step 6: Conclude that these released electrons are what make water the primary electron donor in the light reactions.

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