state gov Rajasthan Housing Board Junior Assistant Mock Test 2023 General Science Biology Human body
In order to prevent breeding of mosquitoes it is advised to put kerosene on the surface of stagnant water. The advantage of this action is that the
1
mosquitoes are repelled by kerosene.
2
mosquitoes are killed by kerosene.
3
mosquitoes get stuck in the layer of kerosene.
4
the layer of kerosene cuts the oxygen supply and thereby stops the mosquito breeding.