Causes And Effects Of Biomagnification MCQ - Practice Questions with Answers
Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET
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EASYIn an area where DDT had been used extensively, the population of birds declined significantly because:
Biomagnification is highest at
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Water Pollution & Its Causes : Industrial Effluents & Biomagnification
- Unlike domestic sewage, wastewater from industries like petroleum, paper manufacturing, metal extraction and processing, chemical manufacturing, etc., often contain toxic substances, notably, heavy metals (defined as elements with density > 5 g/cm3 such as mercury, cadmium, copper, lead, etc.) and a variety of organic compounds.
- A few toxic substances, often present in industrial waste waters, can undergo biological magnification (Biomagnification) in the aquatic food chain.
- Biomagnification refers to an increase in concentration of the toxicant at successive trophic levels.
- This happens because a toxic substance accumulated by an organism cannot be metabolised or excreted, and is thus passed on to the next higher trophic level.
- This phenomenon is well-known for mercury and DDT.
- The given figure shows biomagnification of DDT in an aquatic food chain.
- In this manner, the concentration of DDT is increased at successive trophic levels; say if it starts at 0.003 ppb (ppb = parts per billion) in water, it can ultimately can reach 25 ppm (ppm = parts per million) in fish-eating birds, through biomagnification.
- High concentrations of DDT disturb calcium metabolism in birds, which causes thinning of eggshell and their premature breaking, eventually causing decline in bird populations
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