(i) What ecological term is used
to describe the DDT accumulation at different trophic levels?
(ii) List any one effect of DDT
accumulation on birds.
(iii) Will DDT accumulation lead
to eutrophication?
(iv) Does it affect the BOD?
(v) Name disease caused by accumulation
of any heavy metal.
Answer:
(i) The ecological term used to describe
the DDT accumulation at different trophic levels is called biomagnifications.
(ii) High concentrations of DDT disturb
calcium metabolism in birds, which causes thinning of egg shell and their
premature breaking, eventually causing decline in bird populations.
(iii) Yes, DDT accumulation can
lead to eutrophication.
(iv) It increases the BOD,
resulting in a decrease in dissolved oxygen in the water body,
(v) Eating fish that has accumulated
mercury, a heavy metal, causes a disease called Minamata. It is characterized
by diarrhoea, haemolysis, numbness, deafness, mental derangement, meningitis
and death.
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