Explain the side effects of use of herbicides on hiving things. 

These days, the pesticide industry has shifted its attention to herbicides such as sodium chlorate $\left(\mathrm{NaClO}_{3}\right)$, sodium arsinite $\left(\mathrm{Na}_{3} \mathrm{AsO}_{3}\right)$ and many others.

The shift from mechanical to chemical weed control had provided the industry with flourishing economic market but these are also not environment friendly.

Most herbicides are toxic to mammals but are not as persistent as organo-chlorides. Like organo-chlorides these are not stable so they decompose in the food web. Some herbicides cause birth defects.

Corn fields sprayed with herbicides are more prone to insect attack and plant disease than fields that are weeded manually.

Pesticides and herbicides represent only a very small portion of widespread chemical pollution. A large number of other compounds that are used regularly in chemical and industrial processes for manufacturing activities are finally released in the atmosphere in one or other form.