MCQs on Environmental Issues for Class 12 Biology of NCERT

Questions

76 Global agreement in specific control strategies to reduce the release of ozone depleting substances, was adopted by

1 The Vienna Convention

2 Rio de Janeiro Conference

3 The Montreal Protocol

4 The Koyoto Protocol

View Answer

Answer: The Montreal Protocol

77 A chemical harmful released by Chlorofluorocarbon to ozone is

1 Nitrogen Peroxide

2 Fluorine

3 Chlorine

4 Sulphur dioxide

View Answer

Answer: Chlorine

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78 In an area where DDT had been used extensively, the population of birds declined significantly because

1 Cobras were feeding exclusively on birds

2 Many of the birds eggs laid, did not hatch

3 Birds stopped laying eggs

4 Earthworms in the area got eradicated

View Answer

Answer: Many of the birds eggs laid, did not hatch

79 Greenhouse effect is caused by

1 Green plants

2 Infrared rays

3 UV rays

4 X-rays

View Answer

Answer: Infrared rays

80 Due to eutrophication______.

1 BOD increases

2 BOD decreases

3 algae are destroyed

4 water becomes less harmful

View Answer

Answer: BOD increases

81 Minamata disease is due to pollution of

1 Industrial waste mercury into fishing water

2 Oil spill in water

3 Organic waste into drinking water

4 Arsenic into the atmosphere

View Answer

Answer: Industrial waste mercury into fishing water

82 Measuring Biochemical Oxygen Demand (BOD) is a method used for

1 Measuring the activity of Saccharomyces cerevisiae in producing curd on a commercial scale

2 Working out the efficiency of R.B.Cs. about their capacity to carry oxygen

3 Estimating the amount of organic matter in sewage water

4 Working out the efficiency of oil driven automobile engines

View Answer

Answer: Estimating the amount of organic matter in sewage water

83 Which of the following pollutions forms Heat island?

1 Water

2 Air

3 Land

4 None of these

View Answer

Answer: Air

84 dB is a standard abbreviation used for the quantitative expression of

1 The dominant Bacillus in a culture

2 The density of bacteria in a medium

3 A certain pesticide

4 A particular pollutant

View Answer

Answer: A particular pollutant

85 Among the following, a secondary pollutant is

1 PAN

2 SO₂

3 CO

4 Aerosol

View Answer

Answer: PAN

86 The green house gases, otherwise called radioactively active gases includes

1 Carbon dioxide

2 CH₄

3 N₂O

4 All of these

View Answer

Answer: All of these

87 The main atmospheric layer near the surface of earth is

1 troposphere

2 mesophere

3 ionosphere

4 stratospere

View Answer

Answer: troposphere

88 ______ is the first step of sewage treatment.

1 Precipitation

2 Chlorination

3 Sedimentation

4 Aeration

View Answer

Answer: Sedimentation

89 Identify the correctly matched pair

1 Basal Convention – Biodiversity Conservation

2 Montreal Protocol - Global warming

3 Kyoto protocol – Climatic change

4 Ramsar Convention – Ground water pollution

View Answer

Answer: Kyoto protocol – Climatic change

90 CO emitted by automobiles prevents O-transport to body tissues by

1 Changing O₂ to CO₂

2 Destroying hemoglobin

3 Forming a stable compound with hemoglobin

4 Obstructing the reaction of O₂ with hemoglobin

View Answer

Answer: Forming a stable compound with hemoglobin

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