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 above were the main causes of fish mortality in the lake?

1. 2, 3

2. 3, 4

3. 1, 3

4. 1, 2

Subtopic:  Water Pollution: I | Water Pollution |
NEET - 2008
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According to Central Pollution Control Board (CPCB), which particulate size in diameter (in micrometres) of the air pollutants is responsible for greatest harm to human health?

1. 2.5 or less

2. 1.5 or less

3. 1.0 or less

4. 5.2 or 2.5

Subtopic:  Air Pollution |
 94%
From NCERT
NEET - 2008
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Which one of the following is being tried in India as a biofuel substitute for fossil fuels?

1. Jatropha

2. Azadirachta

3. Musa

4. Aegilops

Subtopic:  Resource Utilisation & Maintenance |
 67%
NEET - 2008
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Which one of the following is the correct percentage of the two (out of the total of 4) green-house gases that contribute to the total global warming?

1. CFCs 14%, CH4 20%

2. CO2 40%, CFCs 30%

3. N2O 6%, CO2 86%

4. CH4 20%, N2O 18%

Subtopic:  Green House Effect & Global Warming |
 79%
From NCERT
NEET - 2008
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Which one of the following statements is correct?

1. Extensive use of chemical fertilizers may lead to eutrophication of nearby water bodies

2. Both Azotobacter and Rhizobium fix atmospheric nitrogen in root nodules of plants

3. Cyanobacteria such as Anabaena and Nostoc are important mobilizers of phosphates and potassium for plant nutrition in soil

4. At present, it is not possible to grow maize without chemical fertilizers

Subtopic:  Water Pollution: I | Water Pollution |
 76%
From NCERT
NEET - 2007
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Which one of the following is being utilized as a source of bio- diesel in the Indian

countryside?

1. Euphorbia

2. Beetroot

3. Sugarcane

4. Pongamia

Subtopic:  Resource Utilisation & Maintenance |
 58%
NEET - 2007
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In which one of the following the BOD (Biochemical Oxygen Demand) of sewage (S),

distillery effluent (DE), paper mill effluent (PE) and sugar mill effluent (SE) have been

arranged in ascending order ?

1. SE < S < PE < DE

2. SE < PE < S < DE

3. PE < S < SE < DE

4. S< DE < PE < SE

Subtopic:  Water Pollution: I | Water Pollution |
NEET - 2007
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In a coal fired power plant electrostatic precipitators are installed to control emission of:-

1. SO

2. NOx

3. SPM

4. CO

Subtopic:  Air Pollution |
NEET - 2007
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Which one of the following is not a bioindicator of water pollution?

1. Sludge-worms

2. Blood-worms

3. Stone flies

4. Sewage fungus

Subtopic:  Water Pollution: I | Water Pollution |
 51%
NEET - 2007
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The "blue baby' syndrome results from

1. excess of chloride

2. methaemoglobin

3. excess of dissolved oxygen

4. excess of TDS (Total Dissolved Solids)

Subtopic:  Water Pollution: II | Water Pollution |
 70%
NEET - 2006
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