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Plants do produce way more oxygen then they need (allowing us animals to breathe) but they do need some oxygen itself, to turn the sugars created by photosynthesis into energy, to burn fuel sort of speak.I’m just curious why plants need o2 in the roots? Don’t plants breathe co2 and animals breath o2? Just want to know the factual basis for this.
Read this for a layman's explanation:
Respiration
And as you can read in that article, plants do take up oxygen through their leaves as well. Even through stems. The roots take up "in water dissolved oxygen", they do not need to be in contact with 'air'.