NCERT - Environmental Issues Multiple Choice Questions and Answers of Class 12 Biology

Questions

46 Which of the following is responsible for acid rain ?

1 Hydrogen

2 Oxygen

3 Sulphur dioxide

4 Methane

View Answer

Answer: Hydrogen

47 Which of the following don't settle in still air

1 water drops

2 sand particles

3 cigarette smoke

4 all of above

View Answer

Answer: cigarette smoke

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48 Phosphate pollution is brought about by

1 Phosphate rocks

2 Fertilizers

3 Phosphate rocks and sewage

4 Fertilizers and sewage

View Answer

Answer: Fertilizers and sewage

49 Eutrophication is often seen in

1 Mountains

2 Deserts

3 Fresh water lakes

4 Ocean

View Answer

Answer: Fresh water lakes

50 Carbon monoxide is a pollutant because it

1 Reacts with O₂

2 Reacts with hemoglobin

3 Inhibits glycolysis

4 Inactivates nervous system

View Answer

Answer: Reacts with hemoglobin

51 Acid rain is caused by increase in the atmospheric concentration of

1 Ozone and dust

2 SO₂ and NO₂

3 SO₃ and CO

4 CO₂ and CO

View Answer

Answer: SO₂ and NO₂

52 Pipelines break and oil seeps into the ground, causing

1 Land pollution

2 Oil spillage

3 water Pollution

4 Air Pollution

View Answer

Answer: Land pollution

53 Sound becomes a hazardous noise pollution if its level is above

1 30 dB

2 80 dB

3 120 dB

4 125 dB

View Answer

Answer: 80 dB

54 Which pollutants are responsible for bronchitis ?

1 O₂, CO₂

2 CO, CO₂

3 SO₂, NO₂

4 Cl₂, H₂S

View Answer

Answer: SO₂, NO₂

55 Fish die in water polluted by sewage due to

1 Pathogens

2 Reduction in O₂

3 Clogging of gills by silt

4 Foul smell

View Answer

Answer: Reduction in O₂

56 Which of the following shows biological amplification?

1 Hg

2 Cd

3 Both (1) and (2)

4 Neither (1) nor (2)

View Answer

Answer: Both (1) and (2)

57 Acid rain is caused by

1 ozone

2 oxides of nitrogen

3 oxides of carbon

4 oxides of sulphur

View Answer

Answer: oxides of sulphur

58 Ultra-violet light causes

1 Photodynamic action

2 Sticky metaphases

3 Formation of pyrimidines

4 Destruction of hydrogen bonds between complementary DNA strands

View Answer

Answer: Destruction of hydrogen bonds between complementary DNA strands

59 Maximum deposition of DDT will occur in

1 Phytoplankton

2 Crab

3 Eel

4 Sea gull

View Answer

Answer: Sea gull

60 The ultraviolet radiations in the stratosphere are absorbed by

1 SO₂

2 Oxygen

3 Ozone

4 Argon

View Answer

Answer: Ozone

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