Q. No.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
(1) Calcium Metabolism in birds
(2) Thinning of eggshell
(3) Premature breaking of eggshell
(4) Decline in bird population
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
The pollutants from man's activities can radically accelerate the ageing process of a lake known as
(1) Cultural Eutrophication
(2) Accelerated Eutrophication
(3) Biomagnification
(4) Both A and B
Which of the following is harmful for aquatic organisms?
(1) Thermal wastewaters
(2) Agricultural waste
(3) Industrial waste
(4) All of these
The prime contaminants of sewage water which act as plant nutrient are
(1) Nitrates and Phosphates
(2) Phosphates
(3) Nitrates, DDT
(4) Cadmium and DDT
Thermal wastewater
(1) Eliminates or reduces the number of organisms sensitive to high temperature
(2) May enhance the growth of plants and fish in extremely cold areas
(3) Cause damage to the indigenous flora and fauna
(4) All of these
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