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Earn 100
What is the problem creating the use of DDT to control mosquitoes?
Important Questions on Ecology and Conservation
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I. Lots of urea and phosphate fertilizers were used in the crops in the vicinity.
II. The area was sprayed with DDT by an aircraft.
III. The lake water turned green and stinky (eutrophication).
IV. Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis.
Which two of the above were the main causes of fish mortality in the lake?
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Represent the union of two sets by Venn diagram for each of the following.
is a prime number between and
is an odd number between and
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I. Sample of highly polluted pond water.
II. Sample from unpolluted pond water.
III. Distilled water.
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Study the graph. Explain how is Oxygen concentration affected the river when sewage is discharged into it.
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I. Arsenic poisoning - Black foot disease
II. Secondary effluent treatment - Biological process
III. Pyrolysis - Solid soil waste disposal
IV. Tubifex - Water pollution indicator
V. Biomagnification - Degradable pollutants
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Explain giving results the cause of the appearance of peaks 'a' and 'b' in the graph.
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Two types of aquatic organisms in a lake show specific growth patterns as shown, in a brief period of time. The lake is adjacent to an agricultural land extensively supplied with fertilizers.
Name the organisms depicting the patterns A and B.
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