Multiple choice

A waste product of photosynthesis is _______ gas.

  1. Hydrogen

  2. Carbon dioxide

  3. Oxygen

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

During photosynthesis, plants take in carbon dioxide and water to produce glucose, releasing oxygen as a byproduct. Hydrogen and carbon dioxide are reactants, not waste products.

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