Q. No.Concentration of DDT in water is 0.003 ppb, what can be the most commonly seen concentration of DDT in zooplankton?
(1) 4 ppb
(2) 5 ppm
(3) 0.04 ppm
(4) 2 ppm
(1) 4 ppb
(2) 5 ppm
(3) 0.04 ppm
(4) 2 ppm
Biomagnification of DDT in a fish eating bird can reach to
(1) 20 ppm
(2) 20 ppb
(3) 25 ppb
(4) 25 ppm
Why does biological magnification happen?
(1) The toxic substances can be digested but are not metabolised by our body
(2) The toxic substances can neither by digested nor be metabolised and just pass on to the next generation
(3) The toxic substances causes genetic mutation that pass to next generation
(4) Both B and C
High concentration of DDT directly disturbs
(1) Calcium Metabolism in birds
(2) Thinning of eggshell
(3) Premature breaking of eggshell
(4) Decline in bird population
The natural aging of a lake by nutrient enrichment of its water is called
(1) Biomagnification
(2) Eutrophication
(3) Biopiracy
(4) Biosystematics
when lake is young, the water is
(1) Cold and clear
(2) Warm and turbid
(3) Cold and turbid
(4) Warm and clear
Streams draining into the lake and introduce nutrients such as ………
(Young lake)
(1) Nitrogen and Phosphorus
(2) DDT and cadmium
(3) DDT
(4) Calcium
The animals which live in warm areas will prefer
(1) A young lake
(2) An old lake
(3) Lake with no nutrients
(4) Cannot be predicted
Large masses of floating Plants-Bog
Are found in
(1) A young lake
(2) An old lake
(3) Nutrients are less
(4) Cannot be predicted
The natural ageing of lake
(1) Depends on climate
(2) Depends on size of lake
(3) May take thousands of years
(4) All of these
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