Check the below NCERT MCQ Questions for Class 9 Science Chapter 14 Natural Resources with Answers Pdf free download. MCQ Questions for Class 9 Science with Answers were prepared based on the latest exam pattern. We have Provided Natural Resources Class 9 Science MCQs Questions with Answers to help students understand the concept very well.
You can refer to NCERT Solutions for Class 9 Science Chapter 14 Natural Resources to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.
Natural Resources Class 9 MCQs Questions with Answers
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
Answer: (d) re-radiated by land and water
If there were no atmosphere around the Earth, the temperature of the Earth will
(b) go on decreasing
(c) increase during day and decrease during night
(d) be unaffected
Answer: (c) increase during day and decrease during night
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.
Answer: (b) It will become poisonous and kill living forms
One of the following factors does not lead to soil formation in nature
(a) the Sun
(d) polythene bags
Answer: (d) polythene bags
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
Answer: (c) ozone and oxygen
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
(d) elemental form of nitrogen
Answer: (b) elemental form of oxygen
Rainfall patterns depend on
(a) the underground water table
(b) the number of water bodies in an area
(c) the density pattern of human population in an area
(d) the prevailing season in an area
Answer: (b) elemental form of oxygen
Among the given options, which one is not correct for the use of large amount of fertilisers and pesticides?
(a) They are eco-friendly
(b) They turn the fields barren after some time
(c) They adversely affect the useful component from the soil
(d) They destroy the soil fertility
Answer: (a) They are eco-friendly
The nitrogen molecules present in air can be converted into nitrates and nitrites by
(а) a biological process of nitrogen fixing bacteria present in soil
(b) a biological process of carbon fixing factor present in soil
(c) any of the industries manufacturing nitrogenous compounds
(d) the plants used as cereal crops in field
Answer: (а) a biological process of nitrogen fixing bacteria present in soil
One of the following processes is not a step involved in the water-cycle operating in nature
Answer: (d) photosynthesis
The term “water-pollution” can be defined in several ways. Which of the following statements does not give the correct definition?
(a) The addition of undesirable substances to water bodies
(b) The removal of desirable substances from water bodies
(c) A change in pressure of the water bodies
(d) A change in temperature of the water bodies
Answer: (c) A change in pressure of the water bodies
Which of the following is not a greenhouse gas?
(b) Carbon dioxide
(c) Carbon monoxide
Answer: (d) Ammonia
Which step is not involved in the carbon-cycle?
(d) Burning of fossil fuels
Answer: (b) Transpiration
(a) a large sized hole in the ozone layer
(b) thinning of the ozone layer
(c) small holes scattered in the ozone layer
(d) thickening of ozone in the ozone layer
Answer: (b) thinning of the ozone layer
Ozone-layer is getting depleted because of
(a) excessive use of automobiles
(b) excessive formation of industrial Units
(c) excessive use of man-made compounds containing both fluorine and chlorine
(d) excessive deforestation.
Answer: (c) excessive use of man-made compounds containing both fluorine and chlorine
Which of the following is a recently originated problem of environment?
(a) Ozone layer depletion
(b) Greenhouse effect
(c) Global warming
(d) All of the above
Answer: (d) All of the above
When we breathe in air, nitrogen also goes inside along with oxygen. What is the fate of this nitrogen?
(a) It moves along with oxygen into the cells
(b) It comes out with the CO2 during exhalation
(c) It is absorbed only by the nasal cells
(d) Nitrogen concentration is already more in the cells so it is not at all absorbed.
Answer: (b) It comes out with the CO2 during exhalation
Top-soil contains the following
(а) Humus and living organisms only
(b) Humus and soil particles only
(c) Humus, living organisms and plants
(d) Humus, living organisms and soil particles.
Answer: (d) Humus, living organisms and soil particles.
Choose the correct sequences
(a) CO2 in atmosphere → decomposers → organic carbon in animals → organic carbon in plants
(b) CO2 in atmosphere → organic carbon in plants → organic carbon in animals → inorganic carbon in soil
(c) Inorganic carbonates in water organic carbon in plants → organic carbon in animals → scavengers
(d) Organic carbon in animals → decomposers → CO2 in atmosphere → organic carbon in plants
Answer: (b) CO2 in atmosphere → organic carbon in plants → organic carbon in animals → inorganic carbon in soil
Major source of mineral in soil is the
(a) parent rock from which soil is formed
Answer: (a) parent rock from which soil is formed
Total Earth’s surface covered by water is
Answer: (a) 75%
Biotic component of the biosphere is not constituted by
Answer: (d) air
An increase in carbon dioxide content in the atmosphere would not cause
(a) more heat to be retained by the environment
(b) increase in photosynthesis in plants
(c) global warming
(d) abundance of desert plants
Answer: (d) abundance of desert plants
Oxygen is returned to the atmosphere mainly by
(a) burning of fossil fuel
Answer: (c) photosynthesis
Low visibility during cold weather is due to
(a) formation of fossil fuel
(b) unbumt carbon particles or hydrocarbons suspended in air
(c) lack of adequate power supply
(d) none of these
Answer: (b) unbumt carbon particles or hydrocarbons suspended in air
Growth of lichens on barren rocks is followed by the growth of
Answer: (a) moss
Marked temperature changes in an aquatic environment can affect
(a) breeding of animals
(b) more growth of aquatic plants
(c) process of digestion in animals
(d) availability of nutrients.
Answer: (a) breeding of animals
Soil erosion can be prevented by
(a) raising forests
(c) excessive use of fertiliser
(d) overgrazing by animals
Answer: (a) raising forests
What happens when rain falls on soil without vegetational cover?
(a) Rain water percolates in soil efficiently
(b) Rain water causes loss of surface soil
(c) Rain water leads to fertility of the soil
(d) Rain water does not cause any change in soil
Answer: (b) Rain water causes loss of surface soil
Oxygen is harmful for
(b) nitrogen fixing bacteria
(d) mango tree
Answer: (b) nitrogen fixing bacteria
Fill in the blanks
1. The outer crust of the Earth is called …………….
2. The life-supporting zone of the Earth where the atmosphere, the hydrosphere and the lithosphere interact and make life possible, is known as the ……………
3. Eukaryotic cells and many prokaryotic cells, need ……………. to break down …………….. molecules and get energy for their activities.
Answer: oxygen, glucose
4. The temperature ranges from …………… to …………… on the moon as it does not have atmosphere.
Answer: -190° C, 110° C
5. The atmosphere can be heated from below by the …………….. that is reflected back or re-radiated by the land or water bodies.
6. The condensation of water is facilitated if some particles could act as ………………. for drops to form around.
7. Rainfall patterns are decided by the prevailing ……………..
Answer: wind patterns
8. The suspended particles released on burning fossil fuels could be unburnt carbon particles or substances called ……………
9. Fresh water is found frozen in the …………….. at the two poles and on snow covered mountains.
Answer: Ice caps
10. …………….. grows on the surface of rocks, release certain substances that cause the rock surface to powder down and form a thin layer of soil.
11. …………….. is a major factor in deciding the soil structure because it causes the soil to become more porous.
12. Nitrogen-fixing bacteria are found in the roots of ……………. in special structures called root nodules.
13. During ……………. the high temperatures and pressures created in the air convert nitrogen into oxides of nitrogen.
14. An increase in the carbon dioxide content in the atmosphere would cause more heat to be retained by the atmosphere and lead to ……………..
Answer: global warming
15. Oxygen from the atmosphere is used up in three processes, namely …………….. respiration and in the formation of ……………….
Answer: combustion, oxides of nitrogen
Match the following columns
|Column I||Column II|
|(a) Ozone hole||(i) Soil structure|
|(b) Lithosphere||(ii) Root nodules of legumes|
|(c) Lichen||(iii) Acid rain|
|(d) Humus||(iv) Greenhouse gas|
|(e) Carbon dioxide||(v) Outer crust|
|(f) Soil erosion||(vi) Formation of soil|
|(g) Frozen fresh water||(vii) CFCs|
|(h) Oxides of nitrogen||(viii) Ice caps at poles|
|(i) Nitrogen fixing bacteria||(ix) Deforestation|
|Column I||Column II|
|(a) Ozone hole||(vii) CFCs|
|(b) Lithosphere||(v) Outer crust|
|(c) Lichen||(vi) Formation of soil|
|(d) Humus||(i) Soil structure|
|(e) Carbon dioxide||(iv) Greenhouse gas|
|(f) Soil erosion||(ix) Deforestation|
|(g) Frozen fresh water||(viii) Ice caps at poles|
|(h) Oxides of nitrogen||(iii) Acid rain|
|(i) Nitrogen fixing bacteria||(ii) Root nodules of legumes|
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