Indiscriminate use of chemicals, pesticides and weedicides by humans are polluting our water bodies, which in turn are harming the living organisms. Study the flow chart and answer the questions based on it.

(a) Why does the concentration of DDT seem to be considerably high in the top consumer ?

(b) How would the organisms at the highest level be affected ?

(c) Name the phenomenon observed.

 

 
 
 
 
 

Answers (1)

a) DDT cannot be metabolised or excreted so gets accumulated by an organism, increase in concentration at successive trophic levels.

b) As it disturbs calcium metabolism for example in fish-eating birds it causes thinning of eggshell and premature breaking of eggs which leads to the decline in population.

c) Biomagnification

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