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<table width="500px" border="solid" bordercolor="black" RULES=NONE FRAME=border bgcolor="#000000"><tr><td align="center" bgcolor="#003300"><font color="FF9900">A plant uses O2 same way animals do: As electron acceptor when oxidicing carbohydrates.
Most anionic forms of nutrients are oxyanions too.
Just as nice to know fact, oxygen is the most common element(by mass) on earth. About half of earth is oxygen, there's also some oxygen in the atmosphere.
Oxygen is bioactive by gaseous elemental O2 and in many oxyanions and organic compounds.