Question

what happen to cells if we cut th onion under the running water

Answer 1

Nothing will happen due the the double layer(cell wall and plasma membrane).

Answer 2

When you cut an Onion, it creates a gas called, Propanethiol S- oxide . When mixed with certain enzymes in the onion , it creates a sulfur gas . These gases then get to your eyes and create a mild acid which irritates eyes.