Question

20.
Explain" biological magnification with the
help of an example. Construct an
quatic food chain showing your tropical
levels​

Answer 1

Biological magnification is defined as the accumulation of a particular substance in the body of the organisms at different trophic levels of a food chain. example--- biomagnification is the accumulation of insecticide DDT which gets accumulated in zooplanktons. Small fishes consume these zooplanktons.

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Answer 2

Consider the following example in a lake ecosystem :

Phytoplankton longrightarrow Zooplankton longrightarrow Fishes longrightarrow Crane

Phytoplankton⟶Zooplankton⟶Fishes⟶Crane

• The above food chain is an example of Grazing Food Chain where

• Phytoplankton are producers
• Zooplankton are primary consumers
• Fishes are secondary consumers
• Crane is the top carnivore
• Bio magnification is defined as the increase in accumulation and concentration of toxins at successive tropic levels.
• For instance, industrial effluents discharged into water bodies are decomposed by phytoplankton for anaerobic respiration and metabolism.
• Zooplankton which prey on the former consumes the underlying toxins. Similarly, concentration of such toxins is maximum at the highest tropic level.

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