How do plant obtain oxygen?

Answer 1

I believe the process is called,"Photosynthesis"!

Plants do not obtain oxygen they produce oxygen through a process called photosynthesis. The sun produces energy and they change carbon dioxide and water into food oxygen is a byproduct of this process.

Answer 2

the oxygen they give us is obtain from water which they break down into its molecules that is hydrogen and oxygen.

hydrogen is used to convert co2 to sugar.oxygen we breath it in as well as plants in the absence of light.