441. Highest DDT deposition shall occur in

A Phytoplankton
B Sea Gull/Birds
C Crab
D Eel
Answer :   Sea Gull/Birds
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442. A lake near a village suffered heavy mortality of fishes within a few days. Consider the following reasons for this?
(1) Lots of urea and phosphate fertilizer were used in the crops in the vicinity
(2) The area was sprayed with DDT by an aircraft
(3) The lake water turned green and stinky
(4) 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?

A (2) and (3)
B (3) and (4)
C (1) and (3)
D (1) and (2)
Answer :   (1) and (3)
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443. DDT causes egg shell thinning in birds because it inhibits

A Calmodulin
B Calcium ATPase
C Magnesium ATPase
D Carbonic anhydrase
Answer :   Calcium ATPase
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444. Total amount of energy trapped by green plants in food is called

A Gross primary production
B Net primary production
C Standing crop
D Standing state
Answer :   Gross primary production
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445. Which one of the following statements pertaining to pollutants is correct

A DDT is a non-biodegradable pollutant
B Excess fluoride in drinking water causes osteoporosis
C Excess cadmium in drinking water causes black foot disease
D Methyl mercury in water may cause "Itai Itai" disease
Answer :   DDT is a non-biodegradable pollutant
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446. River water deposits

A loamy soil
B alluvial soil
C laterite soil
D sandy soil
Answer :   alluvial soil
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Practice More MCQ Question on Biology Section

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