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

46 Which of the following is responsible for acid rain ?

[1] Hydrogen

[2] Oxygen

[3] Sulphur dioxide

[4] Methane

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

Answer: cigarette smoke

48 Phosphate pollution is brought about by

[1] Phosphate rocks

[2] Fertilizers

[3] Phosphate rocks and sewage

[4] Fertilizers and sewage

Answer: Fertilizers and sewage

49 Eutrophication is often seen in

[1] Mountains

[2] Deserts

[3] Fresh water lakes

[4] Ocean

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

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

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

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

Answer: 80 dB

54 Which pollutants are responsible for bronchitis ?

[1] O₂, CO₂

[2] CO, CO₂

[3] SO₂, NO₂

[4] Cl₂, H₂S

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

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)

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

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

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

Answer: Sea gull

60 The ultraviolet radiations in the stratosphere are absorbed by

[1] SO₂

[2] Oxygen

[3] Ozone

[4] Argon

Answer: Ozone

GkSeries.com

NCERT - Environmental Issues Questions and Answers of Class 12 Biology | GkSeries

By Gkseries see more questions

DOWNLOAD CURRENT AFFAIRS PDF FROM APP

Please share this page

Chapters

Teacher Eligibility Test