Question

people tell that to get more oxygen we have to plant trees. But from where do trees get oxygen?​

Answer 1

Answer:

Trees don't need oxygen...

They need Carbon dioxide.

We humans inhale oxygen and exhale carbon dioxide.

Trees take in the carbon dioxide which we release and give out oxygen which we take in...

So it is like a cycle.

                               

                             Intake                                     Output

Trees:             Carbon dioxide                           Oxygen

Humans:             Oxygen                           Carbon dioxide...

Hope it helps

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Answer 2

Answer:

When plant makes their own food by the process of photosynthesis it produces oxygen .

Explanation:

In the process of photosynthesis plants makes glucose by using Coarbon dioxide, water and sunlight as a result glucose and Oxygen (O2) are evolved .

6CO2(Carbon dioxide) + 6H2O(water) ------> C6H12O6 (glucose)+ 6O2 ( Oxygen)