MCQ-Questions-for-Class-9-Science-Natural-Resources
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MCQ Questions for Class 9 Science Chapter 14 Natural Resources help you in active learning and also improve your problem-solving ability. It help students to understand the concepts better and encourage to learn more topics and make the learning more fun.

Chapter 14 Class 9 Science CBSE MCQ Questions with answers can be an effective assessment tool, as they can test a wide range of knowledge and skills. These questions will fulfil the needs of every student and speed up their learning process.

Chapter 14 Natural Resources Class 9 Science MCQ Questions

1. Materials of biological origin which are commonly used to maintain and improve soil fertility are
(a) green manure
(b) biofertilizers
(c) bioinsecticides
(d) both (a) and (b)
▶ (d) both (b) and (b)

2. Regularly breathing air that contains unburnt carbon particles causes health problems such as
(a) asthma
(b) allergies
(c) cancer
(d) all of these
▶ (d) all of these

3. Topsoil contains
(a) living organisms only
(b) humus and soil particles only
(c) dead organisms and living plants
(d) humus, living organisms and soil particles.
▶ (d) humus, living organisms and soil particles.

4. What would happen, if all the oxygen present in the environment is converted to ozone?
(a) We will be protected more
(b) It will become poisonous and kill living forms
(c) Ozone is not stable, hence it will be toxic
(d) It will help harmful Sun radiations to reach Earth and damage many life forms.
▶ (b) It will become poisonous and kill living forms

5. Which of the following phenomenon refers to ‘ozone hole’?
(a) Absorption of carbon-dioxide by plants.
(b) Concentration of ozone as a whole.
(c) Much larger, seasonal, decrease in stratospheric ozone over polar regions of earth.
(d) None of these
▶ (c) Much larger, seasonal, decrease in stratospheric ozone over polar regions of earth.

6. The two forms of oxygen found in the atmosphere are
(a) water and ozone
(b) water and oxygen
(c) ozone and oxygen
(d) water and carbon dioxide
▶ (c) ozone and oxygen

7. Identify the gas that can result in the formation of acid rain.
(a) Ozone
(b) Carbon monoxide
(c) Sulphur dioxide
(d) Chlorofluorocarbon
▶ (c) Sulphur dioxide

8. What does MAB stand for?
(a) Man and biosphere
(b) Man antibodies and bacterial
(c) Man and biotic community
(d) Mayer, Anderson and Bishby
▶ (a) Man and biosphere

9. If there were no atmosphere around the Earth, the temperature of the Earth will
(a) increase
(b) go on decreasing
(c) increase during day and decrease during night
(d) be unaffected
▶ (c) increase during day and decrease during night

10. Which gas associated with the greenhouse effect?
(a) Carbon-dioxide
(b) Oxygen
(c) Nitrogen dioxide
(d) Sulphur dioxide
▶ (a) Carbon-dioxide

11. The elemental forms of carbon are
(a) diamond and graphite
(b) carbonate and graphite
(c) hydrogen carbonate and graphite
(d) carbonate and hydrogen carbonate
▶ (a) diamond and graphite

12. The atmosphere of the Earth is heated by radiations which are mainly
(a) radiated by the Sun
(b) re-radiated by land
(c) re-radiated by water
(d) re-radiated by land and water
▶ (d) re-radiated by land and water

13. Ozone is a molecule containing
(a) three atoms of nitrogen
(b) two atoms of oxygen
(c) three atoms of oxygen
(d) two atoms of nitrogen
▶ (c) three atoms of oxygen

14. Which of the following processes is not a part of the carbon cycle?
(a) Photosynthesis
(b) Transpiration
(c) Respiration
(d) Combustion
▶ (b) Transpiration

15. How is ozone formed?
(a) Three carbon atoms combine to form ozone.
(b) Three oxygen atoms combine to form ozone.
(c) One carbon atom and two oxygen atoms split to form ozone.
(d) One oxygen atom and two hydrogen atoms split to form ozone.
▶ (b) Three oxygen atoms combine to form ozone.

16. ODS stands for
(a) Ozone developing substances
(b) Ozone depleting substances
(c) Ozone developing sources
(d) Ozone depleted sources
▶ (b) Ozone depleting substances

17. The process of nitrogen-fixation by bacteria does not take place in the presence of
(a) molecular form of hydrogen
(b) elemental form of oxygen
(c) water
(d) elemental form of nitrogen
▶ (b) elemental form of oxygen

18. Which of the following is a major cause of air pollution?
(a) Burning of wood
(b) Burning of biogas
(c) Burning of cow dung cakes
(d) Burning of fossil fuels
▶ (d) Burning of fossil fuels

19. Ozone layer of atmosphere protects the living organisms from
(a) high temperature
(b) harmful radiations of sun
(c) hail and snow
(d) water pollution
▶ (b) harmful radiations of sun

20. One of the following processes is not a step involved in the water-cycle operating in nature
(a) evaporation
(b) transpiration
(c) precipitation
(d) photosynthesis
▶ (d) photosynthesis

21. What is air composed of?
(a) Nitrogen, oxygen, methane, carbon-dioxide and noble
(b) Nitrogen, oxygen, carbon-dioxide, water vapours and gases
(c) Nitrogen, carbon-dioxide, oxygen, carbon monoxide and gases
(d) Nitrogen, oxygen, carbon monoxide, water vapours and gases
▶ (b) Nitrogen, oxygen, carbon-dioxide, water vapours and gases

22. Why is ozone layer important?
(a) It is used by living organisms for respiration.
(b) It increases the temperature of the earth.
(c) It reduces the amount of ultraviolet rays reaching the earth.
(d) It reflects the heat from the earth back into the atmosphere.
▶ (c) It reduces the amount of ultraviolet rays reaching the earth.

23. Which of the following is not a greenhouse gas?
(a) Methane
(b) Carbon dioxide
(c) Carbon monoxide
(d) Ammonia
▶ (d) Ammonia

24. What is meant by conserving the environment?
(a) Not destroying natural resources
(b) Not lowering the quality of the environment
(c) Changing natural resources from its original state
(d) Preserving the condition of the nature that has been destroyed
▶ (a) Not destroying natural resources

25. Ecosystem comprises both abiotic and biotic components. Biotic component of an ecosystem consist of
(a) producers
(b) consumers
(c) decomposers
(d) all of these
▶ (d) all of these

26. Heat reflected from earth’s surface is trapped in the atmosphere. What is the phenomenon called as?
(a) Global warming
(b) Ozone depletion
(c) The greenhouse effect
(d) Thermal pollution
▶ (c) The greenhouse effect

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