During the night, plants release a gas called carbon dioxide (CO2). This is a part of their respiration process. Respiration in plants is similar to respiration in animals, where they take in oxygen and release carbon dioxide as a byproduct.
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During the day, plants also release carbon dioxide, but they also undergo photosynthesis. Photosynthesis is a vital process for plants, through which they convert sunlight, water, and carbon dioxide into glucose (sugar) and oxygen. The oxygen produced during photosynthesis is released into the atmosphere as a byproduct.
So, to summarize, plants release carbon dioxide both during the day and at night. During the day, they release oxygen through photosynthesis, while at night, they continue to release carbon dioxide as part of their respiration process. These gases play important roles in the Earth’s atmosphere and the balance of gases that support life on our planet.