Multiple choice

Which of the following gases is used up in photosynthesis and released during respiration?

  1. Nitrogen

  2. Carbon dioxide

  3. Oxygen

  4. Hydrogen
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Photosynthesis uses carbon dioxide as a reactant to produce glucose and oxygen. Respiration does the opposite - it releases carbon dioxide as a waste product when breaking down glucose for energy.

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