How the people get to know that the tree produces oxygen
Answers
Answer: in ancient history many such
great observers were present who were also plants lover they research on plant and come to know that they produces a essiencial gas oxygen we have to protect them.
Explanation: I hope it will help you
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Answer:
See many scientist s are there a over the world and they have conducted experiments
Explanation:
the food eaten by plants gets converted to glucose and it reacts to produce oxygen and water vapour. See if you want to test that plants produce oxygen take two small glass container .In one container keep an insect or any living thing with the lid closed . In the other container plant a tree and keep an insect . You will see the insect died in first container but not in the second. This proves that plants gives o2 . If it wouldn't have given the insect may have died.