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Natural Resources Test - 25

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Natural Resources Test - 25
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Certain gases in the atmosphere known as a greenhouse gas that absorb and emit heat and contributes to global warming. Which of the following gases is not considered in the list of gases known to have a greenhouse effect?
    Solution
    Greenhouse gases generally trap the radiations of the earth which leads to an increase in the temperature of the earth and global warming. The greenhouse gases include water vapor, carbon dioxide, methane, nitrous oxide, and ozone. 
    Thus, the correct answer is option B.
  • Question 2
    1 / -0
    Which of the following phenomena could expose the top layer of soil?
    Solution
    If the top layer of soil is exposed, then it will gradually expose the lower layer of soil, which is hard and rocky in nature. This type of soil is less fertile as it contains less humus. Continued soil erosion will make the land barren or infertile.
    Soil erosion is defined as the wearing away of topsoil. Topsoil is the top layer of soil and is the most fertile because it contains the most organic, nutrient-rich materials. Deforestation can expose the top layer of soil and the land will eventually erode.
    Thus, the correct option is A.
  • Question 3
    1 / -0
    Ozone, shields the earth from the harmful ultraviolet rays from the
    Solution
    • The ozone layer or ozone shield is a region of Earth's stratosphere which contains a high concentration of ozone ($$O_3$$) in relation to other parts of the atmosphere,
    • The ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (UVR) from the sun, protecting life on Earth from its potentially harmful effects.
    • Hence Ozone shields the earth from the harmful ultraviolet rays from the sun.
    • So, the correct answer is 'Sun'.
  • Question 4
    1 / -0
    What is the largest source of freshwater for our planet?
    Solution
    The oceans contain 97.3% of all water on Earth. Although oceans make up the majority of water on Earth, the ocean water is salty and so not usable. Thus, the largest sources of freshwater are polar icecaps and glaciers. 
    So, the correct answer is option B.
  • Question 5
    1 / -0
    Ultraviolet radiation from sunlight causes the reaction that produces:
    Solution
    Air pollution is formed through the reaction of solar radiation with airborne pollutants like nitrogen oxides and volatile organic compounds. These compounds, which are called primary pollutants, are often introduced into the atmosphere through automobile emissions and industrial processes. Ultraviolet light can split nitrogen dioxide into nitric oxide and monatomic oxygen; this monatomic oxygen can then react with oxygen gas to form ozone. 
    Therefore, the correct answer is option C.
  • Question 6
    1 / -0
    A good soil:
    Solution
    Water should percolate slowly in a soil because if water passes too rapidly,  then many of the minerals and organic matter useful for plants will simply be washed away.
    If there is no percolation and all the water is simply held up in the soil, then there will be poor aeration and respiration in plant roots will suffer.
    Therefore, the correct answer is option B.
  • Question 7
    1 / -0
    Plants and animals help in maintaining the balance of
    Solution
    The plants produce oxygen which is taken up by animals for respiration.
    In return, the animals produce carbon dioxide which is taken up by the plants to produce food. Thus, this give and take relationship helps maintain the balance of oxygen and carbon dioxide.
    The correct option is B.
  • Question 8
    1 / -0
    The natural formation of ammonia in soil by the action of bacteria on proteins in decaying organic matter is called
    Solution
    Ammonification is the process of conversion of organic nitrogen content in the dead and decaying matter to ammonium salts which further undergoes nitrification to get converted into the usable form.
    Therefore, the correct answer is option C.
  • Question 9
    1 / -0
    Increase in the percentage of fauna and decrease in flora may be dangerous because it enhances
    Solution
    If there is an increase in the percentage of fauna while the flora decreases, the oxygen consumption will increase will oxygen production will decrease due to less number of plants. Thus, the percentage of carbon dioxide will increase rapidly in the atmosphere.
    The correct option is A.
  • Question 10
    1 / -0
    If there was no carbon dioxide in the earth's atmosphere, the temperature of the earth would be
    Solution
    Some gases prevent the escape of heat from the Earth. An increase in the percentage of such gases in the atmosphere would cause the average temperatures to increase world-wide and this is called the greenhouse effect. Carbon dioxide is one of the greenhouse gases. So, if there were no carbon dioxide, earth will lose all heat and the temperature would be less than the present.
    The correct option is C.
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