Q. No.Streams draining into the lake and introduce nutrients such as ………
(Young lake)
(1) Nitrogen and Phosphorus
(2) DDT and cadmium
(3) DDT
(4) Calcium
(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
Integrated waste water treatment means
(1) By utilising only artificial processes
(2) By utilising only natural processes
(3) By utilising both artificial and natural processes
(4) By utilising advanced and more expensive means
An example of integrated waste water treatment comes from
(1) The town of Arcata along northern coast of California and biologist of Humboldt State University
(2) The town of Bangalore and biologist of Humboldt State University
(3) The town of New York along northern coast of California and biologist of Purdue University
(4) The town of Arcata along northern coast of California and biologist Purdue University
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