Fluoride pollution primarily affects the ...... .

Photochemical smog does not contain .....

What does '$Y$' represent in the given figure?

Due to biomagnification,if the concentration of $DDT$ in water is $0.003 \, ppm$,what will be the concentration of $DDT$ in zooplankton,small fish,large fish,and fish-eating birds,respectively?

The concentration of a pesticide required to destroy $50\%$ of a pest population is called:

The maximum biological magnification of $DDT$ through the food web is seen in: