NEET Biology Class 9 Chapter 6 Natural Resources Multiple Choice Question And Answers

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Natural Resources Multiple Choice Questions

Directions: This section contains multiple-choice questions. Each question has 4 choices (1), (2), and out of which Only One is correct.

Question 1. MAB stands for

  1. Man And Biosphere
  2. Man antibodies and bacteria
  3. Man and biotic community
  4. Mayer, Anderson and Bishby

Answer: 1. Man And Biosphere

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Question 2. The sphere of living matter together with water, air and soil On the surface of the earth is

  1. Lithosphere
  2. Biosphere
  3. Hydrosphere
  4. Atmosphere

Answer: 2. Biosphere

Question 3. The conversion of nitrate to nitrous oxide and nitrogen gas is termed as

  1. Nitrification
  2. Denitrification
  3. Nitrogen-fixation
  4. None of these

Answer: 2. Denitrification

Question 4. The cycling of elements in an ecosystem is called

  1. Chemical cycle
  2. Geochemical cycle
  3. Biogeochemical cycle
  4. Geological cycle

Answer: 3. Biogeochemical cycle

Question 5. The limiting factor in the nitrification of soil is

  1. pH
  2. Temperature
  3. Light
  4. Air

Answer: 1. pH

Question 6. The greenhouse effect is due to the presence of

  1. The ozone layer in the atmosphere
  2. Infrared light reaching the earth
  3. Moisture layer in the atmosphere
  4. CO2 layer in the atmosphere

Answer: The CO2 layer in the atmosphere

Question 7. Acid rain is caused by to increase in concentration of (in the atmosphere)

  1. SO2 and NO2
  2. CO and CO2
  3. CO and SO3
  4. O3and dust

Answer: 1. SO2 and NO2

Question 8. The pollution in a city like Delhi may be controlled to a great extent

  1. By proper sewage and proper exit of chemicals from factories
  2. By wide roads and factories away from the city
  3. By cleaning the city and scanty use of pesticides all of the above
  4. All of the above

Answer: 4. All of the above

Question 9. The stratospheric ozone depletion leads to

  1. Global warming
  2. Increase in the incidence of skin cancers
  3. Forest fires
  4. All the above

Answer: 4. All the above

Question 10. Green house effect refers to

  1. Cooling of earth trapping of
  2. UV rays
  3. Production of cereals
  4. Warming of earth

Answer: 4. Warming of earth

Question 11. Which of the following is most poisonous?

  1. CO
  2. CO2
  3. C
  4. SO2

Answer: 1. CO

Question 12. Acid rain is the secondary effect of

  1. Water pollution
  2. Air pollution
  3. Soil pollution
  4. Sound pollution

Answer: 3. Soil pollution

Question 13. Biological Oxygen Demand (BOD) is a measure of

  1. Industrial wastes poured into water bodies
  2. The extent to which water is polluted with organic compounds
  3. Amount of carbon monoxide inseparably combined with haemoglobin
  4. Amount of oxygen needed by green plants during the night

Answer: 2. Extent to which water is polluted with organic compounds

Question 14. Which one of the following is not used for disinfection of drinking water?

  1. Chlorine
  2. Ozone
  3. Chloramine
  4. Phenyl

Answer: 4. Phenyl

Question 15. Photochemical smog formed in congested metropolitan cities mainly consists of ozone, peroxyacetyl nitrate and NOx smoke, peroxyacetyl nitrate and SO2 hydrocarbons, SO2 and CO2 hydrocarbons, ozone and SOx

  1. Ozone, peroxyacetyl nitrate and NOX
  2. Smoke, peroxyacetyl nitrate and SO
  3. Hydrocarbons, SO2 and CO2
  4. Hydrocarbons, ozone and SOx

Answer: 2. Smoke, peroxyacetyl nitrate and SO

Question 16. Molecules of carbohydrate, fats, and proteins contain

  1. Carbon
  2. Bromine
  3. Chlorine
  4. All of these

Answer: 1. Carbon

Question 17. Soil conservation is the process where

  1. Sterile Soil is converted to fertile soil
  2. Soil is aerated
  3. Soil erosion is allowed
  4. Soil is protected against loss

Answer: 4. Soil is protected against loss

Question 18. Overgrazing causes  negative pollution positive pollution soil erosion reduction in crop yield.

  1. negative pollution
  2. positive pollution
  3. soil erosion
  4. reduction in crop yield

Answer: 1.

Question 19. Water is a resource nondegradable nonmaintainable

  1. Degradable
  2. Maintainable
  3. Renewable
  4. Non-renewable

Answer: 4. Non-renewable

Question 20. In hilly areas, erosion is minimised by

  1. Terracing
  2. Manuring
  3. Ploughing
  4. Mixed cropping

Answer: 1. Terracing

Question 21. The nitrogen cycle involves bacteria capable of changing proteins to ammonia is bacteria of decay denitrifying bacteria

  1. Nitrogen fixing
  2. Bacteria
  3. Ammonifying
  4. Bacteria

Answer: 4. Bacteria

Question 22. Biogeochemical cycles are of

  1. Two types
  2. Three types
  3. Four types
  4. Five types

Answer: 1. Two types

Question 23. Burning of fossil fuels affects

  1. Nitrogen cycle
  2. Carbon cycle
  3. Phosphorus cycle
  4. Water cycle

Answer: 2. Carbon cycle

Question 24. The process of evapotranspiration and precipitation is known as

  1. Carbon cycle
  2. Hydrological cycle
  3. Nitrogen cycle
  4. All of these

Answer: 2. Hydrological cycle

Question 25. The nitrogen content of the biosphere remains constant due to

  1. Nitrogen fixation
  2. Nitrogen cycle
  3. Industrial pollution
  4. Absorption of nitrogen

Answer: 2. Nitrogen cycle

Question 26. The major factor in causing global warming is

  1. Increase in oxygen concentration in the atmosphere
  2. Decrease in carbon dioxide concentration in the atmosphere
  3. Increase in carbon dioxide concentration in the atmosphere
  4. Decrease in atmospheric nitrogen

Answer: 3. Increase in carbon dioxide concentration in the atmosphere

Question 27. Non-renewable source is

  1. Water and gas
  2. Plant and coke
  3. Coke and mineral substances
  4. Energy and water

Answer: 3. Coke and mineral substances

Question 28. Conservation is

  1. Protection of natural resources
  2. Management of natural resources
  3. Proper use of natural resources
  4. All the above

Answer: 4. All the above

Question 29. The largest amount of fresh water is found in

  1. Lakes and streams
  2. Underground
  3. Polar ice and glaciers
  4. Rivers

Answer: 3. Polar ice and glaciers

Question 30. Which of the following do most ecologists think is mainly responsible for the current high rate of extinction of species?

  1. Increased CO2 concentration in the atmosphere
  2. Global warming
  3. Hunting and fishing
  4. Land and water transformation

Answer: 4. Land and water transformation

Question 31. CO2 absorbs some of the …………………… that radiates from the surface of Earth to space.

  1. Ozone
  2. Heat
  3. Ultraviolet light
  4. Smog

Answer: 2. Heat

Question 32. The conversion of N2 gas to a form of nitrogen that can be used by plants is called

  1. Nitrogen fixation
  2. Nitrogen assimilation.
  3. Nitrogen cycling
  4. Nitrogen uptake.

Answer: 1. Nitrogen fixation

Question 33. Human-caused changes to the nitrogen cycle are expected to result in

  1. An increase in acid rain.
  2. An increase in the loss of species from ecosystems.
  3. Higher concentrations of a greenhouse gas.
  4. All of the above

Answer: 4. All of the above

Question 34. Local conditions, such as heavy rainfall or the removal of plants, may limit the amount of nitrogen, phosphorus, or calcium available to a particular ecosystem, but the amount of carbon available to the system is seldom a problem

  1. Organisms do not need very much carbon.
  2. Plants can make their own carbon using water and sunlight.
  3. Plants are much better at absorbing carbon from the soil.
  4. Many nutrients come from the soil, but carbon comes from the air.

Answer:  4. Many nutrients come from the soil, but carbon comes from the air.

Question 35. The recent increase in atmospheric CO2 concentration is mainly a result of an increase in

  1. Primary productivity
  2. The biosphere’s biomass
  3. The absorption of infrared radiation escaping from Earth.
  4. The burning of fossil fuels and wood.

Answer: 3. The absorption of infrared radiation escaping from Earth.

Question 36. The major source(s) of carbon for living things is (are)

  1. Coal, oil, and natural gas
  2. Plants
  3. CO2 in the atmosphere and oceans
  4. Methane in the atmosphere

Answer: 3. CO2 in the atmosphere and oceans

Question 37. Which one of the following groups of organisms is able to fix atmospheric nitrogen by living organisms?

  1. Plants
  2. Fungi
  3. Insects
  4. Bacteria

Answer: 4. Bacteria

Question 38. The biological process by which carbon is returned to its reservoir is

  1. Photosynthesis
  2. Denitrification
  3. Carbon fixation
  4. Cellular respiration

Answer: 4. Cellular respiration

Question 39. Herbivores can also be called

  1. Primary producers
  2. Primary consumers
  3. Secondary consumers
  4. Decomposers

Answer: 2. Primary consumers

Question 40. In the nitrogen cycle, which group of bacteria convert nitrates and nitrites back to atmospheric gas?

  1. Denitrifying bacteria
  2. Nitrifying bacteria
  3. Nitrogen-fixing bacteria
  4. All of these are correct.

Answer: 1. Denitrifying bacteria

Question 41. Burning of fossil fuels add

  1. CO2,SO2, NO2 gases in air
  2. C, SO2, N2 gases in air
  3. CO, SO3 , NO3 gases in air
  4. CH2,CO2,NO2 gases in air

Answer:  1. CO2, SO2, NO2gases in air

Question 42. The atmosphere maintains the temperature on the surface of the earth because

  1. It contains water vapour in it
  2. It holds air, which is a bad conductor of heat
  3. It reflects the heat rays
  4. It absorbs the heat rays

Answer:  2. It holds air, which is a bad conductor of heat

Question 43. Life cannot be sustained on Mars and Venus because of

  1. Oxygen
  2. Carbon dioxide
  3. Nitrogen
  4. Ozone

Answer: 2. Carbon dioxide

Question 44. On moon the temperature ranges from –190°C to 110°C, this is due to

  1. No water bodies present
  2. No water bodies present
  3. No bio-geochemical cycle
  4. No atmosphere

Answer: 4. No atmosphere

Question 45. The life-supporting zone of Earth is

  1. Lithosphere
  2. Hydrosphere
  3. Atmosphere
  4. Biosphere

Answer: 4. Biosphere

Question 46. The percentage of nitrogen present in the atmosphere is

  1. 20%
  2. 50%
  3. 78%
  4. 86%

Answer: 3. 78%

Question 47. Air is

  1. Exhaustible resource
  2. Inexhaustible resource
  3. Perishable resource
  4. both (2) and (3)

Answer: 2. Inexhaustible resource

Question 48. Nitrosomonas changes

  1. Ammonia to nitrate
  2. Ammonia to nitrite
  3. Nitrite to nitrate
  4. Nitrate to ammonia

Answer: 2. Ammonia to nitrite

Question 49. Biosphere occurs

  1. In lithosphere
  2. In the lithosphere and hydrosphere
  3. Interaction of lithosphere, hydrosphere and atmosphere
  4. In the atmosphere and hydrosphere

Answer: 3. Interaction of lithosphere, hydrosphere and atmosphere

Question 50. The daytime temperature of the moon is

  1. 60°C
  2. 70°C
  3. 90°C
  4. 110°C

Answer:  4. 110°C

51. Wind causes weathering of rocks through

  1. Chemical changes
  2. Abrasion
  3. Mechanical forces
  4. Frost action

Answer: 2. Abrasion

Question 52. The amount of rainfall in the wet zones of India is more than

  1. 200 cm
  2. 100-200 cm
  3. 50-100 cm
  4. 20-50 cm

Answer:  200 cm

53. Which one of the following promotes soil erosion?

  1. Conservation tillage
  2. Terracing
  3. Over-grazing
  4. Wind breaks

Answer: 3. Over-grazing

Question 54. Rhizobium is an imprtant…………bacterium.

  1. Nitrogen-fixing
  2. Nitrifying
  3. Denitrifying
  4. Ammonifying

Answer: 1. Nitrogen fixing

Question 55. The ozone hole was discovered in

  1. 1992
  2. 1985
  3. 1995
  4. 1998

Answer: 2. 1985

Question 56. The gas which is mainly responsible for the greenhouse effect is

  1. Nitrogen
  2. Oxygen
  3. Carbon dioxide
  4. Argon

Answer: 3. Carbon dioxide

Question 57. The most exploited non-renewable resource is water petroleum electricity all of the above

  1. water
  2. petroleum
  3. electricity
  4. All of the above

Answer: 4. All of the above

Question 58. Of the total fresh water available on earth, what percentage is in a frozen state?

  1. 90%
  2. 77%
  3. 22%
  4. 10%

Answer: 2. 77%

Question 59. Which one of the following is not a biotic natural resource?

  1. Water
  2. Milk
  3. Fruits
  4. Fish

Answer: 1. Water

Question 60. Smog is a combination of

  1. Fie and water
  2. Smoke and fog
  3. Water and smoke
  4. Air and water

Answer: 2. Smoke and fog

Question 61. Which of the following is a renewable resource?

  1. Wood
  2. Wildlife
  3. Forest
  4. All of them

Answer:  4. All of them

Question 62. A lake with an inflow of domestic sewage rich in organic waste may result in 

  1. drying of the lake due to algal bloom
  2. an increased production of fih due to a lot of nutrients
  3. Death of fih due to lack of oxygen
  4. Increased population of aquatic food web organisms

Answer: 3. Increased population of aquatic food web organisms

Question 63. Drip irrigation is a device to recharge the groundwater to reduce the wastage of water to prevent water pollution all of them

  1. to recharge the groundwater
  2. To reduce wastage of water
  3. to prevent water pollution
  4. all of them

Answer: 2. To reduce waste of water

Question 64. Ozone ( O3) is formed in which zone of the atmosphere?

  1. Mesosphere
  2. Stratosphere
  3. Troposphere
  4. Ionosphere

Answer:  2. Stratosphere

Question 65. The term “water pollution” can be defied in several ways. Which of the following statements does not give the correct definition?

  1. The addition of undesirable substances to water bodies.
  2. The removal of desirable substances from water bodies.
  3. A change in pressure of the water bodies.
  4. A change in temperature of the water bodies.

Answer: The removal of desirable substances from water bodies.

Question 66. Which component of the soil makes it porous?

  1. Humus
  2. Water
  3. Minerals
  4. Living organisms

Answer: 1. Humus

Question 67. CFCs cause

  1. Depletion of the ozone layer
  2. Depletion of CO2
  3. Acid rain
  4. Carbon monoxide poisoning

Answer: 1. Depletion of ozone layer

Question 68. The hydrological cycle is under the control of

  1. Grassland
  2. Forest
  3. Planktons
  4. Epiphytes

Answer: 2. Forest

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