When do plants take in oxygen?

Plants take in oxygen constantly during a process called respiration; they take in oxygen to derive energy from their food and produce carbon dioxide as a waste product. All living things use this process for energy. A major difference between plants and other living things, however, is the process of photosynthesis. Photosynthesis is the process of a plant taking in sunlight as an energy source (e.g., food source). During photosynthesis, a plant takes in carbon dioxide and releases oxygen as a waste product. Photosynthesis only happens in sunlight, or during the day. Plants give out significantly more oxygen in sunlight, or during the day, than they take in. At night, however, they don't photosynthesize; they only respire. This means that at night, plants take in oxygen but don't produce any.
https://indianapublicmedia.org/amomentofscience/sleeping-with-plants.php

https://www.bbc.co.uk/bitesize/guides/zpwmxnb/revision/3

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