If a lake is contaminated with DDT, its highest concentration would be found in

(1) Primary consumer

(2) Secondary consumer

(3) Tertiary consumer

(4) None of these

Subtopic:  Water Pollution - Water Pollution & Portable Water |
 87%
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The most harmful air pollutant produced by automobiles is- 

1. HNO2

2. NO

3. SO2

4. CO

Subtopic:  Air Pollution - Global Warming |
 63%
From NCERT
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Sewage water can be purified by

(1) Aquatic plant

(2) Microorganism

(3) Penicillin

(4) Fishes

Subtopic:  Water Pollution - Water Pollution & Portable Water |
 89%
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Major pollutant in Jet plane emission is -

(1) SO2

(2) CFC

(3) CO

(4) CCl4

Subtopic:  Air Pollution - Greenhouse Effect |
 68%
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 B.O.D. is : 

(1) The amount of O2 utilized by organisms in the water .

(2) The amount of O2 utilized by microorganisms for decomposition .

(3) The total amount of O2 present in water .

(4) All of the above . 

Subtopic:  Water Pollution - Biological Oxygen Demand |
 69%
From NCERT
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What is the intensity of sound in normal conversation 

1. 10 -20 decibal

2. 30 - 60 decibal

3. 70 - 90 decibal

4. 120 - 150 decibal

Subtopic:  Introduction |
 69%
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Which of the following is absent in polluted water

1. Hydrilla

2. Water hyacinth

3. Larva of stone fly

4. Blue green algae

Subtopic:  Water Pollution - Biological Oxygen Demand |
 61%
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Maximum green house gas released by which country

(1) India

(2) China

(3) U.S.A

(4) Britain

Subtopic:  Air Pollution - Greenhouse Effect |
 53%
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Ozone layer of upper atmosphere is being destroyed by

(1) Sulphur dioxide

(2) Carbon dioxide

(3) Chlorofluorocarbon

(4) Smog

Subtopic:  Air Pollution - Greenhouse Effect |
 94%
From NCERT
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The common nitrogen-fixer in paddy fields is
1. Azospirillum

2. Oscillatoria

3. Frankia

4. Rhizobium

Subtopic:  Microbes as Biofertilizer |
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