Question

How do roots of plants get oxygen needed by them for breathing?

Answer 1

Roots of plant have presence of small root hairs on them which helps them in breathing...
roots are buried inside soil that's why the root hairs present on root absorbes air from small air spaces in which air is trapped present in soli

Answer 2

HEY HERE IS YOUR ANS
when you pour water ,the water should enter so it makes some gaps between the soil so by this manner It makes some room for oxygen to enter ...