Key Stage 3
Meaning
Pollution is the harmful chemicals that go into the environment usually made by humans.
Pollution in a Food Chain
- When farmers grow crops, wild animals sometimes eat them, so the farmers spray the crops with poison.
- When the animals die from the poison, they are eaten by other animals which then also eat the poison.
- The poison builds up in the food chain, meaning the top carnivore often has a lot more poison than was originally sprayed on the crops. This can be very harmful to them and even kill them.
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| In this diagram the poison is shown by yellow X's. If each gazelle eats two bushes, then the gazelles will get twice as much poison as the bush. If a cheetah eats two gazelles, then the cheetah will get twice as much poison as the gazelle had. |