CBSE Class 10 Answered
explain the phenomenon of biological magnification .How does it affect organisms belonging to different tropic level particularly the tertiary consumers
Asked by shivaniab7 | 13 Dec, 2019, 02:28: PM
Expert Answer
The intensity of accumulation of toxic substances such as DDT increases as we move from a lower trophic level to a higher trophic level in a food chain. This phenomenon is called biomagnification.
Let’s take the example of DDT which has been applied on farm lands to eradicate pests.
- DDT gets washed off from the farm land and reaches the water body.
- In water, small phytoplankton (producers) would accumulate certain amounts of DDT which would be passed on to the next trophic level, the zooplankton (primary consumers),and then to fish (secondary consumers) which feed on these zooplankton and finally to tertiary consumers.
- Concentration of DDT would increase with each trophic level, with producers having the minimum concentration, while the tertiary consumers having the highest concentration of DDT accumulation.
- This is because tertiary consumers have consumed many secondary consumers which in turn had consumed many primary consumers.In this way, tertiary consumers accumulate the maximum concentration of toxic chemicals.
Answered by Sheetal Kolte | 16 Dec, 2019, 12:41: PM
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