CBSE Class 9 Science Natural Resources Sure Shot Questions C

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1. What is soil erosion ? List two activities which cause soil erosion.

2. What is green house effect ? How is it caused ?

3. Many municipal Corporations are trying water harvesting to improve the availability of water. Give reason.

4. Rain water sometimes contains traces of acid. Why ? Explain in brief.

5. Define the term 'Smog'. Name two types of diseases caused by regularly breathing the polluted air.

6. Give reasons of the following : (i) We are lucky that ozone is not stable near the earth's surface. (ii) The combustion of fossil fuels increases the amount of suspended particles in air.

7. Why is water so necessary for all living organisms ? Mention any two points in support of your answer.'Water is known as AWonder Liquid'. Justify this statement by giving any two reasons.

8. What is atmospheric fixation of Nitrogen ?

9. What is soil erosion ? State any one way by which it can be prevented.

10. What is humus ? What is the role of earth worms in increasing the quantity of humus ?

11. List two ways by which carbon dioxide is 'fixed' in the environment.

12. Name two diseases caused due to an increased content of pollutants in the air produced due to the burning of fossil fuels. [2011 (T-II)]

13. The heaps of solid waste are a menace. Give two reasons.

14. How addition of undesirable substances and change in temperature affect the water life.

15. State any two harmful effects each of : (a) Air pollution and (b) Water pollution

16. What is the role of atmosphere in climate control ?

17. What percentage of nitrogen and oxygen is present in air ?

18. Mention any two human activities which are responsible for water pollution.

19. Mention the role of ozone layer in the atmosphere.

20. Give reason Lichens do not grow in Delhi whereas they commonly grow in Manali or Darjeeling.

21. What causes acid rain? Mantion any damage caused by it on living organisms.

22. What is Green House Effect ? Name compounds causing depletion of Ozone layer ?

23. How do Sun and wind influence the formation of soil ?

24. List any two consequences of global warming.

25. Mention any four measures that should be taken to maintain the soil fertility.

26. Give the chemical formula of ozone. What is its role in atmosphere ?

27. How the presence of pollutants present in the air does affect our health ?

28. Name two air pollutants which when dissolve with water gives rise to acid rain.

29. Name two measures that can be taken to reduce water pollution.

30. Suggest two methods to control air pollution.

31. Differentiate between biodegradable and nonbiodegradable pollutants.

32. Name the process that returns oxygen to the atmosphere.

33. Write the condition responsible for poor visibility in cold weather.

34. Which symbiotic life forms can grow on stones and help in the formation of soil ? Write the mode of their action for making soil from rocks.

35. Why does moon have very cold and very hot temperature variations i.e. from –190°C to 110°C even though it is at the same distance from the sun as earth ?

36. Why does Mathura refinery pose problem to the Taj Mahal ?

37. Explain the role of atmosphere as a blanket. List the factors deciding the rainfall patterns

38. State the effect of the following on aquatic organisms– (a) Removal of dissolved oxygenb(b) Change in temperature

39. How do forest play an important role in maintaining water cycle.

40. Name the two gases given out by burning of fossil fuels which dissolve in rain water to form acid rain.

41. Why is atmosphere essontial for life? Write two points in support of your answer.

42. List any four activities that you think would lead to air pollution.

43. How are clouds formed ?

44. Why do terrestrial forms require fresh water ?

45. Mention any two processes involved in water cycle.

46. How do fossil fuel cause air-pollution ?

47. What is top soil ? Mention any two factors that decide which plants will thrive on that soil.

48. How do the rivers from land, add minerals to sea water?

49. How can we prevent the loss of top soil?

50. Why does the percentage of gases like oxygen, nitrogen and carbon dioxide remain almost the same in the atmosphere?
51. Lichens are called pioneer colonisers of bare rock. How can they help in formation of soil?

5. Why do people love to fly kites near the seashore?

52. Why does water need conservation even though large oceans surround the land masses?

53. “Soil is formed by water.” If you agree to this statement then give reasons.

54. During summer, if you go near the lake, you feel relief from the heat. Why?

55. "The flow of energy is unidirectional whereas the biogeochemical transfer is cyclic". Explain why ?

56. Justify the statement "The nitrogen cycle is supposed to be an ideal cycle in the biosphere".

57. List three ways to control soil pollution.

58. In coastal area, wind current moves from the sea towards the land during day; but during night it moves from land to the sea. Discuss the reason.

59. Following are a few organisms (a) lichen (b) mosses (c) mango tree (d) actus. Which among the above can grow on stones; and also help in formation of soil? Write the mode of their action for making soil.

60. Why does moon have very cold and very hot temperature variations, eg. from –190°C to 110°C even though it is at the same distance from the Sun as the Earth is?

61. There is mass mortality of fishes in a pond. What may be the reasons?

62. Soil formation is done by both abiotic and biotic factors. List the names of these factors by classifying them as abiotic and biotic?

63. All the living organisms are basically made up of C, N, S, P, H and O. How do they enter the living forms? Discuss.

64. Why does the percentage of gases like oxygen, nitrogen and carbon dioxide remain almost the same in the atmosphere?

65. Why are root nodules useful for the plants?

66. Many human activities lead to increasing levels of pollutions of air, water bodies and soil "Isolating these activities to specific and limited areas would not help in reducing pollution". Justify this statement giving at least five reasons.

67. Explain with the help of a labelled diagram carbon cycle in nature.

68. Describe green house effect. How the presence of green house gases would lead to global warming ? Explain.

69. Draw a neat labelled diagram of water cycle in nature.

70. With the help of a neat labelled diagram, depict the cycling of carbon in nature.

71. Mention the two ways in which carbon dioxide is fixed in the environment.

72. Make neat and labelled sketch of Nitrogen cycle in nature.

73. Describe in brief the role of Nitrogen fixing bacteria and of lightening in fixing atmospheric nitrogen.

74. In coastal area, wind current moves from sea towards the land during day; but during night it moves from land to sea. Discuss the reason.

75. How are CFCs harmful for the environment and living beings ?

76. What are the forms of oxygen found in the atmosphere ?

77. "Forests influence the quality of our air, soil and water resources". Justify the statement.

78. Mention the two forms of oxygen found in atmosphere.

79. Name the form of oxygen absorbing U.V. rays.

80. Draw flow diagram of oxygen cycle.

81. What do you understand by ozone layer depletion ?

82. What is air pollution ? How does air pollution affect animal and plant life ?

83. Draw a labelled diagram to show carbon cycle in nature.

84. What are the two ways by which CO2 is returned to the atmosphere ?

85. What are the causes of increase in the concentration of carbon dioxide in the atmosphere?

How is carbon dioxide converted into organic compounds? Justify with the help of a
labelled diagram.

86. Why is circulation of water necessary in the environment ? Discuss any two human activities which are disturbing the water cycle.

87. With the help of a labelled diagram show the cycling of carbon in nature. What are the two ways in which carbon di-oxide is fixed in the environment.

88. With the help of diagram depict the oxygen cycle in nature. What is the % of oxygen present in atmosphere ? What is the role of ozone layer and how is it getting depleted ?

89. How do clouds formed in the sky ? Draw the biogeochemical cycle involved in it. What are the different states in which water is found in the water cycle ?

90. What are biogeochemical cycles ? Draw a labelled diagram to illustrate cycling of oxygen in nature. Write the means of returning oxygen to the atmosphere.

91. What is nitrogen fixation ? Why do plant need to fix nitrogen ? Draw a labelled diagram to illustrate nitrogen - cycle.

92. Draw a labelled diagram of carbon cycle in nature. Describe the role of photosynthesis and respiration in carbon cycle.

93. Study the given figure of Nitrogen cycle and mention what do A, B, C, D, E represents. What will happen if step A does not occur? Write the role of N2 fixing bacteria in the

94. Biosphere. Name two biologically important compounds that contains both O2 and N2

95. What are the types of natural resources?

96. Why plants do not utilise nitrogen directly from atmosphere?

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