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During the night, plants consume oxygen but they don't release any.

But since plants don’t have parents (or kitchens), they have to make their own food. When plants make their own food, it is called photosynthesis.
Photosynthesis is a big word, isn’t it? It means light (photo) used to make something (synthesis). Hhmmm…can you guess how plants make their food?
If you guessed the sun, you are right! Here’s how it works…

A General Plant Structure We're going to look at plant structure in this section

At night, when photosynthesis can’t take place, plants continue to consume oxygen but they don’t release any back into the room. Would that mean that plants really do compete with humans for oxygen?

Biology of Plants: Introduction - MBGnet

Answer to Why don't plants use highly energetic ultraviolet light for photosynthesis? Would it be impossible to evolve a photosynthetic system that uses ultraviolet light

I have koi in outside fish ponds. At times during the long summer days there is an occurrence called an algae bloom where the water in the pond becomes filled with very small suspended algae. During the day there is no problem with the respiration of the koi that I have in the pond… but because the algae use up so much available oxygen during the night and do not add any O2 to the water…my koi in the very early morning hours before the sunlight starts photosynthesis of the algae run out of the amount of oxygen they need for respiration and are forced to breathe atmospheric O2 at the surface of the pond! They gasp for O2 out of the water from the atmosphere where there is enough available for them to survive. My point is in water ponds there is a semi closed environment where plants can use up so much oxygen at night that they force the fish to get their oxygen elsewhere. When days become shorter the algae bloom will naturally diminish if I wait it out and do not do massive water changes or resort to killing the floating algae with a chemical plant killer algaecide that will not kill my fish if used in the proper doses. Plants do use O2 at night and do not give off any O2 in darkness!

When a plant combines water, carbon dioxide and sun-energy to make the glucose there is always something left over. It is called oxygen—the very same oxygen we need to breathe. Because the plants don’t need it, they get rid of it. When a plant gets rid of the oxygen they don’t need, it is called respiration. A plant gets rid of oxygen through its leaves, stems and flowers, fruits or vegetables. And when they do, we have the oxygen we need. Thanks, plants~Photosynthesis facts

P lants are alive, just like people and animals

Living things all do certain things: They grow and die

They use the sunlight and the green in their leaves to make sugars from carbon dioxide (which they breathe in through their leaves during the day) and water. This sugar is then used to give the plant energy so that it can grow. This process is called photosynthesis and is the most important process on the planet, as many other plants and animals depend on plants to survive. Most of the energy is used to make new plant material, although some of it is stored by the plant for use during the months when there is less sunlight.

C4 photosynthesis: how some plants avoid photorespiration
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