4. “Plants need both oxygen as well carbon dioxide, but both are included as waste". Comment.
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Because during daytime plants release oxygen by the process of photosynthesis and in night there is no sunlight so they absorb Oxygen and release carbon dioxide as a waste .
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In the process of photosynthesis, plants take in CO2 (carbon dioxide) from the air and combine it with water absorbed through their roots. They use energy from sunlight to turn these ingredients into carbohydrates (sugars) and oxygen, and they release extra oxygen to the air. For this reason, the forests of the planet are important sources of the oxygen in the atmosphere, and they help keep the level of CO2 in the atmosphere low.
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