Answer:
The
by-products of fertilizer industries are pesticides and some chemical fertilizers,
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 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 bid-magnification.
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