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Environmental Issues

Question
CBSEENBI12047412
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Phenomenon involving increase in concentration of non-degradable pollutants from lower to higher trophic levels is called

  • biomagnification

  • bioaccumulation

  • biodegradation

  • bioinvasion

Solution

A.

biomagnification

Biomagnification is the increase in concentration of the toxicant at successive trophic level. It happens because a toxic substance accumulated by on organism cannot be metabolised or excreted and is thus passed on to the next higher trophic level.

Bioaccumulation refers to the accumulation of substances such as pesticides or other chemicals in an organism.

Biodegradation is the chemical dissolution of organic matter by bacteria, fungi or other biological means into nutrients that can be used by other organisms.

Bioinvasion is the rapid expansion of a species into regions where it had not previously existed, often as a result of human agency.

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