Multiple choice

Which of the following gases is used 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

Carbon dioxide (CO2) is used by plants during photosynthesis to make glucose, and it is released as a byproduct of cellular respiration in living organisms. This creates a balanced cycle between plants and animals. Nitrogen, oxygen, and hydrogen are not exchanged in this specific way between these two processes.

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