Sunday, 24 March 2019

Class IX NATURAL RESOURCES 9


Practice Paper
Subject Biology (2020)
Class IX                         CH- 14 Natural Resources                                 
 I. Short Answer Type Questions:
  1. What are the resources on the Earth which are necessary to meet the basic requirements of all life-forms on the Earth?
  2. What do you mean by the lithosphere?
  3. Define the atmosphere.
  4. What causes winds?
  5. Why is water essential for life?
  6. Define hydrosphere.
  7. What is the biosphere?
  8. What are the abiotic and biotic components of the biosphere?
  9. The percentage of carbon dioxide in our atmosphere is a mere fraction of a percent, why?
  10. Which gas is produced when glucose molecules breakdown using oxygen
  11. Write the name of substance which are bits of decayed living organisms present in the soil.
  12.  What is the role of the atmosphere in climate control?
  13. Write two human activities that would lead to air pollution.
  14. What are the two biotic components of the biosphere?
  15. What is the role of root nodules in the leguminous plants?
  16. Which gas of atmosphere leads to global warming?
  17. Which compound is responsible for the hole in the Ozone layer of the atmosphere?
  18. write the name of gas which is a major component of the atmosphere of Venus and Mars
  19. Write the two factors which are responsible for weathering of rocks
  20. Which organism sensitive to a SO2 gas in the air
  21. What is the name of the symbiotic relationship between fungi and certain blue-green algae?
  22. Define nitrification
  23. How do global warming increase CO2 in the atmosphere?
  24. Write the name of free-living nitrogen-fixing bacteria.
  25. What are the ill effects of breathing polluted air on human health?
  26. Write the name of two forms of oxygen found in the atmosphere. What is its importance?
  27. Write two biologically important compounds that contain both nitrogen and oxygen.

II. Short Answer Type Questions:
  1. Write the name of two measures by which water pollution can be reduced
  2. What is the greenhouse effect?
  3. What is the role of the Ozone layer in the atmosphere? 
  4. Give reasons
    (a) Why lichens do not grow in the polluted areas?
    (b) How lichens help in making soil from rocks?
  5. Write the name of two gases which are formed by the burning of fossil fuels and dissolves in rainwater to form acid rain.
  6. Write two activities of humans that are responsible for an increase in the carbon dioxide content of the air.
  7. Give reasons:
    (a) The ozone layer should not be stable near the Earth's surface.
    (b) The combustion of fossil fuels increases the number of suspended particles in the air.
  8. (a) Why does Moon have very cold and very hot temperature variations even though it is at the same distance from the sun as earth?
    (b) Why does the Mathura Refinery Bose problem to the Taj Mahal?
  9. Differentiate between biodegradable and non- biodegradable pollutants.
  10. Why is water so necessary for all living organisms? Mention any two points in support of your answer. 
  11. Water is known as a wonder liquid that justifies this statement by giving any two reasons.
  12. Draw a diagram of the oxygen cycle occurring in nature.
  13. How the following factors contributed to the formation of soil?
    (a) Wind (b) Water (c) Sun
  14. How are acid rain and smog caused?
  15. How is the life of an organism living in water affected when water gets polluted
  16. Write any two ways by which water pollution affects the aquatic organisms
  17. What is the ozone hole where is it found? What is its effect?
  18. How are CFCs harmful to the environment and living beings?
  19. How are clouds formed? Explain in detail.
  20. Name the three constituents of abiotic components of the Biosphere. Explain their major role in the biosphere.
  21. Write the three harmful effects of pollutant water on the organisms
  22. State three harmful effects of the burning of fossil fuels.
  23. State reason for the following statement:
    (a) People love to fly kites near the seashore
    (b) Dust is a pollutant
    (c) Fertile soil has a lot of humus.
  24. How does the direction of the wind change in coastal areas during the daytime and during the night? Explain giving a reason. Name two more factors that influence winds.
  25. Write the name of two forms of carbon. Name any two forms in which carbon is found in a combined state. Briefly explain how it can be said that all life forms are based on carbon-containing molecules.
  26. Ozone is poisonous and is found in the upper atmosphere of Earth yet the world is worried about its depletion. Explain why? Write any two methods to control the ozone layer depletion.
  27. How is the atmosphere on earth different from the atmosphere on Venus and Mars? State two ways by which the percentage of carbon dioxide is fixed on the earth.
  28. Write the name :
    (a) the process by which carbon is incorporated into life forms.
    (b) the process by which nitrates are converted to free nitrogen.
    (c) the cyclic flow of nutrients like nitrogen and oxygen between the non-living environment and living organisms.
  29. What is the greenhouse effect? List two greenhouse gases.
  30.  State the ultimate effects on the increase in greenhouse gases in the environment
  31. How do modern farming practices bring about the conversion of fertile soil to barren soil? Explain briefly.
  32. What are two different states in which water is formed during the water cycle?
  33. What is the major source of fresh water in the city /town /village, where you live?
  34. Do you know of any activities which may be polluting these water sources?
  35. How does a forest play an important role in maintaining the water cycle?
III. Long Answer Type Questions:
  1. Explain the biological and physical methods of nitrogen fixation.
  2. How is soil formed? What is soil erosion? Write two steps to control soil erosion.
  3. What will happen if the Ozone Layer will completely be depleted?
  4. Describe an activity to explain the effect of flowing water on the topsoil and write your conclusion.
  5. Urbanization and industrialization are mainly responsible for the increase in environmental pollution justify this statement and suggest ways and means check it.
  6. Percentage of gases like oxygen nitrogen and carbon dioxide remain almost the same in the atmosphere. Give reasons.
  7. (a) Two elements hydrogen and oxygen form a compound Z which is required during the photosynthesis by plants and is necessary for life to identify that right its molar mass.
    (b) Draw the biochemical cycle of Z in nature and explain it.
  8. (a) Mention two consequences of the large scale deforestation.
    (b) How does the use of large amounts of fertilizers and pesticides harm the soil?
    (c) What is soil pollution?
    (d) What is the role played by the vegetative cover on the ground?
  9. (a) What is the role of the Sun in the formation of soil?
    (b) A motor car with its glass totally closed is parked directly under the Sun. The inside temperature of the car rises very high. Explain why?
  10. (a) Life does not exist on Mars and Venus. Why?
    (b) Why do we call the atmosphere as a blanket of the earth?
  11. (a) Draw a diagram of the nitrogen cycle in nature.
    (b) Mention any two differences between nitrogen fixation and nitrification.
  12. (a) Give a schematic representation of the carbon cycle, level the main process involved in it.
    (b) Give two ways in which nitrogen from the atmosphere is converted into a usable form.
  13. Why does the temperature range from - 190 Celsius to 110 Celsius on the surface of the moon?
  14. (a) How will you know that the air in your locality is contaminated with pollutants like Sulphur dioxide without having any technical instrument?
    (b) How does air pollution affect the living organism?
  15. (a) Does the availability of water support the richness of the biodiversity?
    (b) What will happen to the aquatic organism if you add the waste material or undesired substances into a pond?
  16. (a) What happened to the water vapour evaporates from the water bodies like the sea, river pond, etc.?
    (b) Is the biotic factor also responsible for the formation of soil?
  17. (a) Do you think that the abiotic factor helps in the formation of soil?
    (b) What happens to the fertilizers and pesticides used by farmers? Is it affect the living organism?
NCERT QUESTIONS:
  1. How is our atmosphere different from the atmospheres on Venus and Mars? 
  2. How does the atmosphere act as a blanket?
  3. What causes winds?
  4. How are clouds formed?
  5. List any three human activities that you think would lead to air pollution.
  6. Why do organisms need water?
  7. What is the major source of fresh water in the city/town/village where you live?
  8. Do you know of any activity which may be polluting this water source?
  9. How is soil formed? 
  10. What is soil erosion?
  11. What are the methods of preventing or reducing soil erosion?
  12. What are the different states in which water is found during the water cycle?
  13. Name two biologically important compounds that contain both oxygen and nitrogen.
  14. List any three human activities which would lead to an increase in the carbon dioxide content of the air.
  15. What is the greenhouse effect?
  16. What are the two forms of oxygen found in the atmosphere?
  17. Why is the atmosphere essential for life?
  18. Why is water essential for life?
  19. How are living organisms dependent on the soil? Are organisms that live in water totally independent of soil as a resource?
  20. You have seen weather reports on television and in newspapers. How do you think we are able to predict the weather?
  21. We know that many human activities lead to increasing levels of pollution of the air, water-bodies, and soil. Do you think that isolating these activities to specific and limited areas would help in reducing pollution?
  22. Write a note on how forests influence the quality of our air, soil and water resources.

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