Looking for authentic SEBA Class 9 Science Chapter 14 (Natural Resources) MCQ solutions for the 2026–27 academic year? Access complete multiple-choice questions with correct options, detailed explanations, biogeochemical cycles objective rules, ozone layer notes, and environmental concepts to score top marks in your annual exams.
MCQ
1. Which of the following is NOT a natural resource?
a) Air
b) Water
c) Plastic
d) Soil
Answer: c) Plastic
2. What makes Earth suitable for life?
a) Suitable temperature
b) Water
c) Food sources
d) All of these
Answer: d) All of these
3. The region where land, air, and water interact to support life is called:
a) Atmosphere
b) Hydrosphere
c) Biosphere
d) Lithosphere
Answer: c) Biosphere
4. Biotic components include:
a) Rocks
b) Soil
c) Water
d) Plants
Answer: d) Plants
5. Which of the following is an abiotic component?
a) Animals
b) Humans
c) Temperature
d) Plants
Answer: c) Temperature
6. What forms the outer crust of Earth?
a) Atmosphere
b) Lithosphere
c) Hydrosphere
d) Biosphere
Answer: b) Lithosphere
7. Major gas in the atmosphere is:
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Hydrogen
Answer: b) Nitrogen
8. Approximate percentage of CO₂ in Earth’s atmosphere:
a) 78%
b) 21%
c) 0.03–0.04%
d) 95%
Answer: c) 0.03–0.04%
9. Atmosphere acts like a blanket because:
a) It is thick
b) Air is a poor conductor of heat
c) It has oxygen
d) It rains
Answer: b) Air is a poor conductor of heat
10. Planet with almost 95–97% CO₂ in the atmosphere:
a) Earth
b) Venus
c) Jupiter
d) Mercury
Answer: b) Venus
SEBA Class 9 Science Chapter 14 MCQ Solutions
11. What causes winds?
a) Uneven heating of Earth
b) Rainfall
c) Earthquake
d) Rotation of the moon
Answer: a) Uneven heating of Earth
12. Warm air is:
a) Heavier
b) Lighter
c) Same weight
d) Undefined
Answer: b) Lighter
13. Sea breeze blows from:
a) Land to sea
b) Sea to land
c) East to west
d) West to east
Answer: b) Sea to land
14. Land breeze blows during:
a) Morning
b) Evening
c) Night
d) Noon
Answer: c) Night
15. Dust particles help in:
a) Soil formation
b) Cloud formation
c) Combustion
d) Respiration
Answer: b) Cloud formation
16. Winds change direction due to:
a) Earth’s rotation
b) Rainfall
c) Soil type
d) Photosynthesis
Answer: a) Earth’s rotation
17. Water covers how much of Earth?
a) 10%
b) 30%
c) 50%
d) 75%
Answer: d) 75%
18. Most of the Earth’s water is:
a) Fresh water
b) Salty water
c) Frozen water
d) Vapour
Answer: b) Salty water
19. Freshwater is mainly found in:
a) Oceans
b) Rivers and lakes
c) Atmosphere
d) Rocks
Answer: b) Rivers and lakes
20. Water vapour changes into water by:
a) Evaporation
b) Condensation
c) Sublimation
d) Freezing
Answer: b) Condensation
Class 9 Science Chapter 14 MCQ Question Answer SEBA 2026-27
21. Rain is formed when:
a) Air heats up
b) Water freezes
c) Droplets become heavy
d) Wind blows
Answer: c) Droplets become heavy
22. Snowfall occurs when:
a) The temperature is very high
b) Air is very cold
c) Winds blow strongly
d) Rain evaporates
Answer: b) Air is very cold
23. Most rainfall in India is due to:
a) Sandstorms
b) Monsoons
c) Tornadoes
d) Cyclones
Answer: b) Monsoons
24. All life processes in organisms occur in:
a) Oxygen
b) Sand
c) Water
d) Soil
Answer: c) Water
25. Dissolved oxygen in water is needed for:
a) Rainfall
b) Growth of fish
c) Evaporation
d) Soil formation
Answer: b) Growth of fish
26. Hot water from industries causes:
a) Water cooling
b) Thermal pollution
c) Soil erosion
d) Wind formation
Answer: b) Thermal pollution
27. Topmost fertile layer of soil is called:
a) Subsoil
b) Bedrock
c) Topsoil
d) Clay
Answer: c) Topsoil
28. Soil contains:
a) Minerals
b) Humus
c) Microorganisms
d) All of these
Answer: d) All of these
29. Which factor breaks rocks by expansion and contraction?
a) Wind
b) Sun
c) Roots
d) Animals
Answer: b) Sun
30. Which organism helps in soil formation?
a) Lions
b) Elephants
c) Lichens
d) Snakes
Answer: c) Lichens
Natural Resources Class 9 SEBA MCQ Notes
31. Soil erosion is caused by:
a) Plant growth
b) Wind and water
c) Humus
d) Photosynthesis
Answer: b) Wind and water
32. Which human activity damages soil the most?
a) Using organic manure
b) Planting trees
c) Excessive use of fertilizers
d) Watering fields
Answer: c) Excessive use of fertilizers
33. The layer of soil that supports maximum life is:
a) Bedrock
b) Topsoil
c) Subsoil
d) Mantle
Answer: b) Topsoil
34. Soil erosion can be prevented by:
a) Cutting trees
b) Afforestation
c) Overgrazing
d) Destruction of forests
Answer: b) Afforestation
35. Humus is formed by:
a) Rocks
b) Decayed plants and animals
c) Metals
d) Sandstorms
Answer: b) Decayed plants and animals
36. Which of the following increases soil fertility?
a) Earthworms
b) Plastics
c) Acids
d) Hot water
Answer: a) Earthworms
37. Nitrogen in the atmosphere is:
a) Directly used by plants
b) Directly used by animals
c) Not directly usable
d) Used for respiration
Answer: c) Not directly usable
38. Nitrogen is fixed into soil by:
a) Birds
b) Bacteria
c) Oxygen
d) Rocks
Answer: b) Bacteria
39. Photosynthesis converts CO₂ into:
a) Water
b) Nitrogen
c) Glucose
d) Oxygen
Answer: c) Glucose
40. CO₂ increases mainly due to:
a) Planting trees
b) Burning fossil fuels
c) Rainfall
d) Snowfall
Answer: b) Burning fossil fuels
SEBA Class 9 Science Chapter 14 Multiple Choice Questions
41. Greenhouse effect is caused by excess:
a) Nitrogen
b) Carbon dioxide
c) Oxygen
d) Ozone
Answer: b) Carbon dioxide
42. Which process releases oxygen?
a) Respiration
b) Combustion
c) Photosynthesis
d) Evaporation
Answer: c) Photosynthesis
43. Ozone layer protects Earth from:
a) Heat
b) Oxygen
c) Ultraviolet rays
d) Sound waves
Answer: c) Ultraviolet rays
44. Which gas forms 21% of the atmosphere?
a) Carbon dioxide
b) Nitrogen
c) Oxygen
d) Argon
Answer: c) Oxygen
45. Carbon dioxide is returned to the atmosphere by:
a) Photosynthesis
b) Respiration
c) Cloud formation
d) Soil erosion
Answer: b) Respiration
46. CFCs damage the:
a) Nitrogen cycle
b) Ozone layer
c) Carbon cycle
d) Water cycle
Answer: b) Ozone layer
47. Which is a major cause of air pollution?
a) Photosynthesis
b) Burning fossil fuels
c) Drinking water
d) Planting trees
Answer: b) Burning fossil fuels
48. Acid rain is caused by:
a) Oxygen
b) Nitrogen oxides and sulphur oxides
c) Carbon monoxide only
d) Hydrogen
Answer: b) Nitrogen oxides and sulphur oxides
49. Smog is a mixture of:
a) Smoke + fog
b) Water + dust
c) Oxygen + nitrogen
d) CO₂ + O₂
Answer: a) Smoke + fog
50. Which disease is linked to polluted air?
a) Asthma
b) Diabetes
c) Typhoid
d) Malaria
Answer: a) Asthma
51. Water pollution leads to decrease in:
a) Humus
b) Dissolved oxygen
c) Nitrogen
d) Helium
Answer: b) Dissolved oxygen
52. Thermal pollution is caused by:
a) Hot water discharged into rivers
b) Melting glaciers
c) Heavy rainfall
d) Earthquakes
Answer: a) Hot water discharged into rivers
53. Replacing forests with buildings leads to:
a) More rainfall
b) More wildlife
c) Less oxygen production
d) Soil formation
Answer: c) Less oxygen production
54. Which activity increases CO₂ levels?
a) Afforestation
b) Photosynthesis
c) Burning petrol
d) Storing water
Answer: c) Burning petrol
55. Best way to reduce pollution is:
a) Isolate polluting areas
b) Stop all factories
c) Reduce pollution at source
d) Use more fertilizers
Answer: c) Reduce pollution at source
56. When water, sand/soil, and air in a closed bottle are kept in sunlight, which one heats up the fastest?
a) Water
b) Sand/soil
c) Air
d) All heat equally
Answer: b) Sand/soil
57. Why does the temperature reading in shade differ from sunlight?
a) Shade is hotter
b) Shade prevents direct heating
c) Thermometer does not work in sunlight
d) None of these
Answer: b) Shade prevents direct heating
58. When an incense stick is placed near the edge of a bottle containing a candle, the smoke flows:
a) Downward
b) Sideways into the bottle
c) Outside the bottle
d) Nowhere
Answer: b) Sideways into the bottle
59. Smoke rises upward when kept above a burning candle because:
a) Hot air rises
b) Cold air rises
c) Smoke is heavier
d) Candle pulls air
Answer: a) Hot air rises
60. In the bottle experiment with water vapour and smoke, clouds form when:
a) The bottle is heated
b) The bottle is pressed and released
c) Only when smoke enters
d) When sunlight enters
Answer: b) The bottle is pressed and released
61. What is needed for cloud droplets to form in air?
a) Dust or smoke particles
b) Only water
c) Only cold air
d) Only heat
Answer: a) Dust or smoke particles
62. In India, maximum rainfall typically occurs in:
a) Winter
b) Summer (April–May)
c) Monsoon (June–September)
d) Spring
Answer: c) Monsoon (June–September)
63. Rain is NOT always accompanied by thunder and lightning. Thunder is most common in:
a) Winter
b) Monsoon storms
c) Autumn
d) Early morning
Answer: b) Monsoon storms
64. What instrument is used to measure rainfall?
a) Thermometer
b) Barometer
c) Hygrometer
d) Rain gauge
Answer: d) Rain gauge
65. For accurate rain-gauge data, it should be placed:
a) Under a tree
b) In open area away from buildings
c) Inside a room
d) On a hilltop
Answer: b) In open area away from buildings
66. Monsoon winds are caused mainly by:
a) Earth’s rotation
b) Uneven heating of land and water
c) Mountains
d) Waves
Answer: b) Uneven heating of land and water
67. Are monsoons responsible for rainfall all over the world?
a) Yes, in all countries
b) No, only in tropical countries
c) Yes, except deserts
d) Only in cold regions
Answer: b) No, only in tropical countries
68. Lichens grow best in areas with:
a) High air pollution
b) Very little pollution
c) Too much dust
d) High noise
Answer: b) Very little pollution
69. On trees near busy roads, lichens are usually:
a) More
b) Less
c) Equal on all sides
d) Brightly coloured
Answer: b) Less
70. Lichens disappear from tree bark mainly because of:
a) Water pollution
b) Noise pollution
c) Air pollution (SO₂)
d) Light pollution
Answer: c) Air pollution (SO₂)
Class 9 Science Natural Resources Objective Questions
71. Water harvesting mainly helps in:
a) Increasing river water
b) Increasing groundwater
c) Making water dirty
d) Creating lakes only
Answer: b) Increasing groundwater
72. Which method is used in water harvesting?
a) Dams only
b) Rooftop rainwater collection
c) Cutting forests
d) Burning waste
Answer: b) Rooftop rainwater collection
73. Areas near lakes or rivers usually show:
a) Less plant and animal life
b) More plant and animal life
c) No difference
d) Only animals
Answer: b) More plant and animal life
74. Dry, rocky regions have:
a) High biodiversity
b) Very little biodiversity
c) Same as water bodies
d) Only plants
Answer: b) Very little biodiversity
75. Which season shows more plants and small animals in open land?
a) Summer
b) Winter
c) After rains
d) Before rains
Answer: c) After rains
76. When soil is mixed with water and settles, layers form due to:
a) Equal-size particles
b) Different particle sizes
c) Dry soil
d) No air
Answer: b) Different particle sizes
77. Floating matter on water above soil is usually:
a) Pebbles
b) Humus
c) Sand
d) Clay
Answer: b) Humus
78. Dissolved substances in soil-water can be detected by:
a) Touching the water
b) Smelling the water
c) Evaporating the water
d) Colour of soil
Answer: c) Evaporating the water
79. In the tray experiment, soil without plants loses:
a) Less soil
b) Equal soil
c) More soil
d) No soil
Answer: c) More soil
80. Plants prevent soil erosion mainly by:
a) Cooling the soil
b) Roots holding soil
c) Making soil wet
d) Blocking sunlight
Answer: b) Roots holding soil
81. Global warming mainly causes:
a) More ice formation
b) Rising sea levels
c) Less heat in atmosphere
d) Shorter summers
Answer: b) Rising sea levels
82. Which of the following is a greenhouse gas?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Helium
Answer: c) Carbon dioxide
83. The ozone layer protects us from:
a) Visible light
b) UV radiation
c) Sound waves
d) Infrared rays
Answer: b) UV radiation
84. Which gas harms the ozone layer the most?
a) CFCs
b) Oxygen
c) Carbon monoxide
d) Water vapour
Answer: a) CFCs
85. The ozone hole is becoming:
a) Larger and affects skin cancer rates
b) Smaller and harmless
c) Uneven but harmless
d) Unrelated to pollution
Answer: a) Larger and affects skin cancer rates
🔬 Updated MCQ Guide Notice: This page features a full collection of SEBA Class 9 Science Chapter 14 (Natural Resources) Multiple Choice Questions (MCQs) with accurate options and detailed explanations, fully updated for the 2026–27 academic session in accordance with the latest revised Assam Board (SEBA) curriculum.
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