In the human eye,............. absorbs $UV-B$ radiation.

All of the following are the ill effects of particulate pollutants on human health $EXCEPT$ . . . . . .

The process of aging of a lake by human activities occurs at a very rapid rate,which is called......

Why is $CNG$ considered a better fuel than diesel?
$(a)$ It cannot be adulterated.
$(b)$ It takes less time to fill the fuel tank.
$(c)$ It burns more efficiently.
$(d)$ It is cheaper.
$(e)$ It is less inflammable.
Choose the most appropriate answer from the options given below:

Damage to hearing is caused by sound which exceeds

The addition of elements like nitrogen and phosphorus to a lake through streams leads to: