Do plants use oxygen?
Yes, like all multicellular organisms, plants use oxygen in order to fully oxidize (and thus fully extract the energy from) organic food molecules. During the growing season, in the daytime, plants also photosynthesize. This is a process in which plants reduce CO2 into organic molecules (which are used to make plant tissues or stored for later energy use). During this process plants produce O2. When photosynthesizing, plants often make more O2 than they use, but they are still using O2.

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No, they breathe out oxygen

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Contrary to popular belief, the oxygen really comes from water taken in by the plant. Most people think this comes from the carbondioxide that the plant "breathes" in. Up until the 19th century, many scientist thought the same thing; that plants breathes in CO2 and out O2. In 1930, C.B. van Niel proved this was false in an experiment which used heavy oxygen (18O) in CO2, instead of normal oxygen. When the oxygen was given off, it wasn't heavy oxygen, it was normal, thus concluding that oxygen exhaled by plants comes from water, not carbondioxide.

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Yes,plants do use oxygen but this is a very small amount! After they have taken in carbon dioxide and have produced oxygen as a by product, they use a small amount of this oxygen for their own respiration

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