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Plants use the CO2 waste gas from animal respiration to make glucose for chemical energy for cells and they put out oxygen into the atmosphere. Oxygen is taken in by animals, used to break down glucose to make ATP for energy for cellular processes, and giving out CO2 which plants take in for photosynthesis.arbon dioxide is used by plants during photosynthesis to manufacture glucose; this is where the carbon in the equation comes from.
What role do plants play in the carbon cycle? The role that plants play in the carbon cycle is to absorb carbon dioxide and release oxygen as part of the process of photosynthesis. Humans on the other hand, absorb oxy â¦ gen and release carbon dioxide through the process of respiration.