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Natural Resources Class 9 Extra questions





Given below are the Class 9 Science Extra Questions for Natural Resources
(a) Multiple Choice Questions
(b) Very shorts answer type
(c) shorts answer type<
(d) Long answer questions

Multiple Choice Questions

Question 1.
Which of the following is not a green house gas?
(a) Methane
(b) Carbon dioxide
(c) Carbon monoxide
(d) Ammonia

Question 2.
Which of the following is a recently originated problem of environment?
(a) Ozone layer depletion
(b) Green house effect
(c) Global warming
(d) All of the above

Question 3.
Oxygen is harmful for
(a) ferns
(b) nitrogen fixing bacteria
(c) chara
(d) mango tree

Question 4.
Soil erosion can be prevented by
(a) raising forests
(b) deforestation
(c) excessive use of fertilizer
(d) overgrazing by animals

Answer

1.(d)
2.(d)
3.(b)
4. (a)


Very Short Answer

Question 5.
Name the two oxides formed by burning of fossil fuels, which are responsible for acid rain?

Answer

(i) Sulphur dioxide and sulphur trioxide.
(ii) Nitrous oxide and nitrogen dioxide.


Question 6.
Along with the natural resources available on the earth, what else is required to meet the basic requirement of all life forms on the earth?

Answer

Solar energy


Question 7.
Which part of solar radiation is absorbed by ozone layer?

Answer

Ultravoilet


Question 8.
Name two biologically important compounds that contain both oxygen and nitrogen?

Answer

DNA (Deoxy ribonucieic acid ) and RNA (Ribonucleic acid) are two biologically important compounds that contain both oxygen and nitrogen


Question 9.
What is greenhouse effect?
Question 10.
In which regions is soil erosion very difficult to revert?

Answer

Bare vegetation


Question 11.
What is biogeochemical cycle?
Question 12.
Name two gases which causes greenhouse effect?

Answer

Carbondioxide, CFC


Question 13.
Name the various organisms involved in nitrogen cycle?

Answer

Nitrogen fixers, Nitrifying bacteria, denitrifying bacteria, e.g. Rhizobium, Nitrosomonas, Nitrobacter, Pseudomonas and Thiobacillus


Question 14.
Name two processes in which oxygen is used from the atmosphere?

Answer

Combustion and Respiration


Question 15.
Name the factor responsible for change in rainfall pattern in india?

Answer

Burning of Fossil fuel
cutting of trees
green house effect
Use of Fertilizer and pesticides


Short Answer Type

Question 16.
How the frozen water between cracked rocks causes the cracks to widen?

Answer

On freezing water expands and that causes cracks to widen .


Question 17.
Name the different states in which water is found during the water cycle?

Answer

Solid state : ice
Liquid state: RaIn
Gasoeus state : Water Vapour


Question 18.
List any three factors responsible for making soil?

Answer

Climite
Living Organism
Topography


Question 19.
Explain the formation of acid rain?

Answer

The fossil fuels like coal and petroleum contain small amounts of nitrogen and sulphur. When these fuels are burnt, nitrogen and sulphur too are burnt and this produces different oxides of nitrogen and sulphur. These oxides disolve in water to forms acids and give rise to acid rains


Question 20.
What are the consequences of global warming?
Question 21.
What causes winds?

Answer

Winds are caused by the uneven heating of the atmosphere in different regions of the Earth. When the air above the land gets heated , it started to rise and a region of low pressure is created and air from the higher pressure moves to this region of lower pressure


Question 22.
State the harmful effects of ozone depletion?
Question 23.
How is the atmosphere of Venus/Mars different from that of earth? Name two main gases present in earth’s atmosphere?
Question 24.
The atmosphere act as a blanket, how?
Question 25.
Explain with example how do living organisms influence the formation of soil. Why is earth’s crust important for living beings?
Question 26.
How is water vapour formed in nature?
Question 27.
How do sun and wind influence the formation of soil?
Question 28.
How ozone layer protects us?
Question 29.
What is Nitrogen cycle?

Long Answer type

Question 30.
(i)What causes of movement of air?
(ii) Mention the factors which influence these winds?
Question 31.
(i)What the harmful effects of modern farming practices? (ii)Mention any three effects?
Question 32.
(i)How is soil pollution caused?
(ii)Write three ways to prevent soil pollution?
Question 33.
Explain how forest influence the quality of air, soil and water resources. State two ways in which atmospheric carbon dioxide is fixed?
Question 34.
Explain the causes of water pollution? Discuss how you can contribute in reducing water pollution?
Question 35.
Draw a schematic diagram of water cycle in nature?
Question 36.
Explain the following terms:
(a)Nitrogen fixation
(b)Nitrification
(c)Denitrification
Question 37.
Draw well labelled diagram of oxygen cycle in nature? Explain in how many ways O2 is used up from the atmosphere and how it returns back to atmosphere?
Question 38.
Draw a well labelled nitrogen cycle in nature. Describe one biological and one physical method of conversion of nitrogen to forms nitrates and nitrites?
Question 41.
In what forms the water is found on the earth surface? Describe in brief?
Question 42.
The overuse of fertilizers and pesticides is harmful for the soil. Why?

Summary

This Natural Resources Class 9 Extra questions with answer is prepared keeping in mind the latest syllabus of CBSE . This has been designed in a way to improve the academic performance of the students. If you find mistakes , please do provide the feedback on the mail.





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