What are the by-products of fertiliser industries ? How do they affect the environment ?

Explanation

The by-products of fertiliser industries are pesticides and some chemical fertilisers. They are non-biodegradable, so they get accumulated at each trophic level. These mix up with soil and water. From there, these pesticides are absorbed are absorbed by the growing plants along with water and minerals.
When herbivores eat these plants, these poisonous chemicals pass into their bodies through the food chain. When carnivores eat herbivores, these pesticides transfer to their bodies. Man being omnivore, eats both plants and herbivores and these gets accumulators into their body.
Thus, pesticides enter the food chain at the producer level and in the process of transfer of food through food chains, these harmful chemicals get concentrated at each trophic level.
This is called bio-magnification.