Photosynthesis · Botany

What is the primary byproduct of photosynthesis that is released into the atmosphere through the stomata?

  1. Carbon dioxide
  2. Water vapor
  3. Oxygen
  4. Methane
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Correct answer: Oxygen

Oxygen is produced during the photolysis of water in Photosystem II. While some is used for plant respiration, the majority diffuses out of the leaf as a byproduct, supporting aerobic life on Earth.

Difficulty: Medium Question 6 of 20

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