Question

What is biomagnification?​

Answer 1

Answer:

Defination: Bio magnification also called biological concentration or biological amplification, is characterized by the increase in amount of some non bíodegradable substances in in successor tropic levels of a food chain.

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1. DDT interferes with the egg-shell formation in many birds. The shells remain thin and break by bird's weight during incubation. Dieldrin is about 5 times more toxic than DDT when ingested and 40 times more poisonous when absorbed.

2. Biomagnification of mercury into fish through the food chain was responsible for large number of deaths due to Minamata disease in Japan.

3. Selenium accumulates in the plants growing on selenium-rich soils. Through food chain, such plants cause stunted growth, loss of appetite, gastro-intestinal disorders, etc. in the animals grazing on such plants.

4. Due to this phenomenon our food grains such as wheat and rice, vegetables and fruits, and even meat contain varying amount of such toxic chemicals.