Biology - Environmental Issues Important Questions and Answers of Class 12 of NCERT

Questions

91 Montreal Protocol aims at

1 Control of CO₂ emission

2 Reduction of ozone depleting substances

3 Biodiversity conservation

4 Control of water pollution

View Answer

Answer: Reduction of ozone depleting substances

92 Treatment of sewage involves:

1 removal of suspended particles

2 allow aerination for bacterial action

3 removal of nitrates and phosphates

4 all of these

View Answer

Answer: all of these

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93 Common indicator organism of water pollution is:

1 Entamoeba histolytica

2 Escherichia coli

3 Eichhornia crassipes

4 Lemna paucicostata

View Answer

Answer: Escherichia coli

94 Which rays strike on earth due to depletion of ozone layer ?

1 Ultraviolet

2 Infrared

3 Visible light

4 Microwaves

View Answer

Answer: Ultraviolet

95 Main approach for conservation of water is

1 Afforestation

2 Constructing waste water treatment plnts and recycling the treated water

3 by storing rain water and recharge groun water

4 all of these

View Answer

Answer: all of these

96 BOD is ______ in polluted water and ______ in potable water.

1 more, less

2 less, medium

3 medium, more

4 less, more

View Answer

Answer: more, less

97 Increase in the concentration of pollutants in higher trophic levels is known as

1 Biomagnification

2 Biodegradation

3 Eutrophication

4 Recycling

View Answer

Answer: Biomagnification

98 ______ is used to convert organic pollutants into water vapour and CO₂.

1 Electrostatic precipitator

2 Flame combustion

3 Absorption

4 Wet-scrubber

View Answer

Answer: Flame combustion

99 Which method is used to control pollutants of particulate nature ?

1 Combustion

2 Absorption

3 Electrostatic precipitators

4 Oxidation pond

View Answer

Answer: Electrostatic precipitators

100 Soil pollution can be reduced by

1 biological manures

2 using biofertilizers

3 biological control

4 all of these

View Answer

Answer: all of these

101 Most abundant water pollutant is

1 Industrial wastes

2 Pesticides

3 Detergents

4 Ammonia

View Answer

Answer: Industrial wastes

102 Most hazardous metal pollutant of the automobile exhaust is

1 Lead

2 Mercury

3 Cadmium

4 Copper

View Answer

Answer: Lead

103 Shell of egg in bird becomes thin (not properly formed) due to the pollution of pesticides. This is due to interference in the activity of :

1 Calmodulin

2 Mg ATPase

3 Ca ATPase

4 None of these

View Answer

Answer: Calmodulin

104 Most harmful environmental pollutants are

1 Natural nutrients in excess

2 Human organic wastes

3 Nonbiodegradable chemicals

4 Waste animal feed

View Answer

Answer: Nonbiodegradable chemicals

105 The atmosphere of big metropolitan cities is polluted most by

1 Automobile exhausts

2 Radio-active fall out

3 Household waste

4 Pesticides residue

View Answer

Answer: Automobile exhausts

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