12th Class Biology Mcqs with Answers Chapter 27 | 2nd year Biology Mcqs With Answers

Chapter 27

Man and his Environment

Encircle the most appropriate answer among the following options

1. What is the harm from the depletion of Earth’s ozone layer?

• The average temperature of earth’s surface will increase gradually
• The oxygen content of the atmosphere will decrease
• Increased amount of ultra violet radiation will reach earth’s surface
• Sea levels will rise as the polar ice caps will gradually melt

2. Acid rain is formed due to contribution from the following pair of gases choose which one is correct:

• Methane and ozone
• Oxygen and nitrous oxide
• Methane and sulpher dioxide
• Carbon dioxide and sulpher dioxide

3. Which of the followings is a prime health risk associated with greater UV

radiation through the atmosphere due to depletion of stratospheric ozone?

• Damage to digestive system
• Increased liver cancer
• Neurological disorder
• Increased skin cancer

4. The most serious environmental effect posed by hazardous wastes is choose which one is correct:

• Air pollution
• Contamination of groundwater
• Increased use of land for landfills
• Destruction of habitat

5. The concentration of which gas is highest in our environment?

• Oxygen
• Hydrogen
• Nitrogen
• Carbon dioxide

6. Which of the followings is not due to global warming?

• Rising sea level
• Increased agricultural productivity worldwide
• Worsening health effects
• Increased storm frequency and intensity

7. Which of the followings is not a primary contributor to the greenhouse effect?

• Carbon dioxide
• Carbon monoxide
• Chlorofluorocarbons
• Methane gas

8. The increase in the concentration of CO2 in our environment in last fifty

years is about choose which one is correct:

• 20%
• 10%
• 14%
• 6%

9. The depletion in the ozone layer is caused by choose which one is correct:

• Nitrous oxide
• Carbon dioxide
• Chlorofluorocarbons
• Methane

10. A major in-stream use of water is for choose which one is correct:

• Producing hydroelectric power
• Dissolving industrial wastes
• Agricultural irrigation
• Domestic use

11. Which of the followings is the example of municipal and industrial discharge

pipes?

• Non-point source of pollution
• Violations of the clean water act
• Point sources of pollution
• Irrigation

12. The presence of high coliform counts in water indicate choose which one is correct:

• Contamination by human wastes
• Phosphorus contamination
• Decreased biological oxygen demand
• Hydrocarbon contamination

13. How the biological oxygen demand gets affected with the increased presence of organic matter in water?

• The oxygen demand increases
• The oxygen demand decreases
• The oxygen demand remains unchanged
• None of the above

14. Which of the followings is not a major source of groundwater contamination?

• Agricultural products
• Landfills
• Septic tanks
• All of the above are major sources of groundwater contamination

15. Which of the following is not considered as part of water use planning?

• Waste water treatment
• Water diversion projects
• Storm sewer drainage
• Water use planning considers all of the above issues

16. The stage in which the biological processes are used to purify water in a

wastewater treatment plants is called choose which one is correct:

• Secondary sewage treatment
• Primary sewage treatment
• Wastewater reduction
• Biochemical reductio

17. Groundwater mining in coastal areas can result into choose which one is correct:

• Increase in the salinity of groundwater
• Decrease in the toxicity of groundwater
• Decrease in the salinity of groundwater
• Increase in the water table

18. Which of the followings is not an important characteristic of the green

revolution?

• Mechanized agriculture
• Hybrid seeds
• Hybrid seeds
• Slash and burn

19. The three primary soil macronutrients are choose which one is correct:

• Carbon, oxygen and water
• Copper, cadmium and carbon
• Potassium, phosphorus and nitrogen
• Boron, zinc and manganese

20. Which of the followings has negative effects on the soil and water due to

conventional, mechanized farming practices?

• Soil compaction
• Reduction in soil organic matter
• Soil erosion
• All of the above

21. Non-renewable resources include various metals, non-metallic minerals and choose which one is correct:

• Fossil fuels
• Coal
• Petrol
• Oil

22. CFCs released from choose which one is correct:

• Vehicles
• TV
• Refrigerator
• Factories

23. The nuclear energy is derived by splitting the nucleus of choose which one is correct:

• Radioactive atom
• Radioactive cell
• Radioactive substance
• Radioactive element

24. Methane gas is produced during the scientific processes of choose which one is correct:

• Incineration
• Hydrogenation
• Pyrolysis
• Bioconversion

25. The global human population grew very slowly until choose which one is correct:

• The origin of agriculture
• The industrial revolution
• Hunter-gatherer societies emerged
• The 1970

26. The first stage in demographic transition is choose which one is correct:

• An increase in population growth
• An increase in birth rate
• A decline in population growth
• A decrease in death rate

27. Population growth is an environmental issue because choose which one is correct:

• Human create pollution
• Human population are growing quickly
• Humans are dependent on the environment for their existence
• All of the above

28. In 1947, at the time of independence the population of Pakistan was choose which one is correct:

• 35.5 million
• 38.5 million
• 32.5 million
• 33.5 billion

29. Solving environmental problems is ultimate responsibility of choose which one is correct:

• Religion
• The government
• Individual
• Educational institution

30. The burning of fossil fuel contributes to all of the following except choose which one is correct:

• Global warming
• Acid rain
• It contribute to all of the above
• Ozone depletion

31. Which of the following substance does not contribute to the greenhouse effect?

• CFC’s
• Nitrogen
• CO²
• Methane

32. Which of the followings is the primary cause of acid rain?

• Burning tropical forests
• Nuclear power station
• CFC’s
• Burning high sulfur coal

33. Which substance destroys ozone?

• Hydrogen
• Chlorine
• Carbon
• Sulfur

34. What is the primary cause of species extinction today?

• Habitat loss
• Population
• Introduction of competing species
• Over hunting

35. Which of the followings is not caused by deforestation?

• All result from deforestation
• Soil erosion
• Increases carbon dioxide
• Loss of biodiversity

36. Eutrophication of a lake occurs as a result of choose which one is correct:

• Nutrient overloads
• Biological magnification
• Acid rain
• Pesticide run off

37. Which of the following statements about ozone depletion is not correct?

• An ozone hole was discovered over antarctica
• CFC’s are found in some air conditioning system
• Ozone in the upper atmosphere is beneficial because it absorbs infrared radiation
• At ground level ozone is a pollutant

38. A chemical, which kills the weed in a crop is known as choose which one is correct:

• Herbicide
• Germicide
• Pesticide
• Insecticide

39. Hydroelectric power is the electric power generated by the energy of choose which one is correct:

• Flowing water
• Dam water
• River water
• Falling water

40. Mental illness choose which one is correct:

• Alzheimer
• Population explosion
• Scurvy
• Burning of fossil fuel

41. Oxide of nitrogen choose which one is correct:

• Population explosion
• Scurvy
• Alzheimer
• Burning of fossil fuel

42. Disease prevention medicine and food hygiene choose which one is correct:

• Population explosion
• Burning of fossil fuel
• Scurvy
• Alzheimer

43. Nutrition deficiency choose which one is correct:

• Congenital diseases
• Population explosion
• Alzheimer
• Scurvy

44. Greenhouse effect choose which one is correct:

• Increase CO₂
• Fungi
• Air pollutant
• Insects

45. Lead compound choose which one is correct:

• Insects
• Fungi
• Renewable resource
• Air pollutant

46. Insecticide choose which one is correct:

• Renewable resource
• Fungi
• Insects
• Air pollutant

47. Water choose which one is correct:

• Insects
• Renewable resource
• Air pollutant
• Fungi

48. CO choose which one is correct:

• 2%
• Fresh water in lakes
• 20%
• Brain damage

49. Less than 1% choose which one is correct:

• Fresh water in lakes
• 20%
• Upper layer of earth’s crust
• 2%

50. Oxygen in air choose which one is correct:

• 20%
• Upper layer of earth’s crust
• 2%
• Fresh water in lakes

51. Soil choose which one is correct:

• Fresh water in lakes
• Upper layer of earth’s crust
• Brain damage
• 20%

52. Taj Mahal choose which one is correct:

• Kwashiorkor
• Stone monuments
• Eutrophication
• UV radiation

53. Hormonal disorder choose which one is correct:

• Stone monuments
• Cretinism
• Kwashiorkor
• Eutrophication

54. Phosphate choose which one is correct:

• Eutrophication
• UV radiation
• Kwashiorkor
• Stone monuments

55. Which of the followings is not a major greenhouse gas?

• Carbon dioxide
• Methane
• Ozone
• Water vapour

56. The reason for signing 1987 Montreal Protocol was choose which one is correct:

• To stop global trade of products made from endangered animals
• To do away with the use CFC’s which were found to be responsible for depletion of the ozone layer
• To prohibit and ban nuclear testing in tropical deserts and oceans
• To start using renewable sources of energy instead of fossil fuels to reduce the anthropogenic greenhouse effect

57. Which of the following countries is the largest source of carbon dioxide

emissions from fossil fuel burning?

• Countries of the former U.S.S.R.
• Developing nations
• North America
• Japan and China

58. Which of the following results are not affected due to depletion of the

stratospheric ozone layer?

• Greater incidence of premature skin aging
• Higher rates of lung cancer
• Higher rates of skin cancer
• Enhanced incidence of severe sunburns

59. As a result of rising global temperatures following two major impacts are

expected choose which one is correct:

• Relatively long summers and drier winters
• Rise in the sea level and regional climatic changes
• Increased water levels in water bodies like lakes and streams but more consistent flooding patterns
• Increased water levels in lakes and streams and comparatively larger floodplains

60. Which one of the following non-biodegradable waste can pollute the earth to dangerous levels of toxicity, if not handled properly?

• DDT
• CFC
• Radioactive substances
• PAN

61. What proportion of UV radiation from the sun normally absorbed by the

atmospheric layer of ozone?

• More than 99%
• around a quarter
• Less than 10%
• about half

62. Which of the following environment problems is not caused by human

interference in the nitrogen cycle?

• Ozone depletion in stratosphere
• Eutrophication
• Increased acid rain
• Increases global warming due to release of nitrous oxide

63. In order to address the problem of ozone depletion, the United Nations

convened a meeting in 1987 in Canada. In that meeting, all the member

nations agreed to reduce down the production and use CFC. What was the

name of this agreement?

• Kyoto Agreement
• Chemical Stewardship Program
• Montreal Protocol
• Vancouver Convention

64. Out of the below listed greenhouse gases, which one is entirely anthropogenic in origin?

• Carbon dioxide
• Methane
• CFCs
• Nitrous oxide

65. Among the given choices below, regarding the greenhouse effect which one is having least certainty?

• The heat energy in the atmosphere increases due to addition of greenhouse gases
• An increase in the number of tropical storms will be observed due to global warming
• Global warming will result in rising sea levels
• Various human activities are resulting into higher concentration of greenhouse gases

66. Which of the followings is non-biodegradable?

• Animal bones
• Nylon
• Tea leaves
• Wool

67. Which among the followings is not a major use of CFCs?

• Cleaning of computer parts
• Production of plastic foams
• Pressurizing agent in aerosol cans
• Buoyancy gas for blimps and balloons

68. Model predictions about global climate change indicates that choose which one is correct:

• There are close agreement on trends and values (for example, predicted carbon dioxide concentration)
• No agreement at all
• There are close agreement on trends however; little agreement on values
• There is general agreement on trends but little agreement on values

69. Which of the following pollutants causes ozone holes in the ozone layer?

• CO²
• SO²
• CO
• CFC