NCERT Biology - Environmental Issues Questions and Answers for Class 12

61 World Environment Day is celebrated every year on ______.

[1] 5^th March

[2] 15^th April

[3] 15^th May

[4] 5^th June

Answer: 5th June

62 SO₂ pollution is indicated by

[1] Deschampsia (grasses)

[2] Sphagnum (Mosses)

[3] Usnea (Lichens)

[4] Cucurbita (climbers)

Answer: Usnea (Lichens)

63 Fluoride pollution mainly affects

[1] Brain

[2] Teeth

[3] Heart

[4] Kidney

Answer: Teeth

64 As it travels along the food chain, the concentration of DDT

[1] Increases

[2] Remains constant

[3] Decreases

[4] Fluctuates randomly

Answer: Increases

65 SO₂ and NO₂ produce pollution by increasing

[1] Neutrality

[2] Acidity

[3] Alkalinity

[4] Buffer action

Answer: Acidity

66 Gas leaked during Bhopal tragedy was

[1] Ethyl isothiocyanate

[2] Sodium isothiocyanate

[3] Potassium isothiocyanate

[4] Methyl isocyanate

Answer: Methyl isocyanate

67 Addition of phosphates and nitrates/fertilizers into water leads to

[1] Increased algal growth

[2] Nutrient enrichment (eutrophication)

[3] Reduced algal growth

[4] Increased growth of decomposers

Answer: Nutrient enrichment (eutrophication)

68 Pollutants having most lasting effect are

[1] Pesticides

[2] Smoke from chimneys

[3] SO₂

[4] CO

Answer: Pesticides

69 Compounds of ______ cause Minamata disease

[1] mercury

[2] cadmium

[3] cobalt

[4] fertilisers

Answer: mercury

70 Algal bloom results in

[1] Global warming

[2] Salination

[3] Eutrophication

[4] Biomagnification

Answer: Eutrophication

71 The range of normal human hearing is in the range of

[1] 10 Hz to 80 Hz

[2] 50 Hz to 80 Hz

[3] 50Hz to 15000 Hz

[4] 15000 Hz and above

Answer: 50Hz to 15000 Hz

72 Growing agricultural crops between rows of planted trees is known as

[1] Social forestry

[2] Jhum

[3] Taungya system

[4] Agroforestry

Answer: Jhum

73 Maximum threat to the world is from

[1] Global warming

[2] Ozone hole

[3] Water pollution

[4] Soil erosion

Answer: Ozone hole

74 Carbon released in the atmosphere increase the level of

[1] Methane

[2] GHGs

[3] Gases

[4] Air Pollution

Answer: GHGs

75 Which one of the following is a wrong statement?

[1] Greenhouse effect is a natural phenomenon

[2] Eutrophication is a natural phenomenon in freshwater bodies

[3] Most of the forests have been lost in tropical areas

[4] Ozone in upper part of atmosphere is harmful to animals

Answer: Ozone in upper part of atmosphere is harmful to animals

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