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Air around Us Test - 8

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Air around Us Test - 8
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  • Question 1
    1 / -0
    Second most abundant constituent of dry air in terms of volume after nitrogen is:
    Solution
    Second most abundant constituent of dry air in terms of volume after nitrogen is oxygen. Nitrogen and oxygen together constitute 99% of air.
  • Question 2
    1 / -0
    Plant absorb ________ to make their own food.
    Solution
    Plants make their own food by the process of photosynthesis. To carry out photosynthesis, plants need carbon dioxide, water, and nutrients. The process of photosynthesis takes place only in the presence of sunlight, and oxygen is given out as a by-product.
    Hence the option B is correct.
  • Question 3
    1 / -0
    Balance of oxygen and carbon dioxide in atmosphere is maintained by:
    Solution
    The balance of oxygen and carbon dioxide is maintained by plants, animals, and humans. Green plants use up carbon dioxide during photosynthesis and release oxygen as a product.

    Whereas, animals and humans use up oxygen during respiration and release carbon dioxide as a by-product. This maintains the overall balance of oxygen and carbon dioxide.

    Hence option D is correct.
  • Question 4
    1 / -0
    The gas X is only about 20 parts out of 100 parts of air in the atmosphere. It is needed for decomposition of organic matter. The gas X is 
    Solution
    Air is a mixture of gases, mainly containing nitrogen (about 78% by volume) and oxygen (about 21%). Oxygen is needed for decomposition of organic matter.
  • Question 5
    1 / -0
    Which does not need help of air in its movement?
    Solution
    All the other mentioned activities require natural air for them to move whereas a ceiling fan is moved by electricity. 

    The correct answer is option (C).
  • Question 6
    1 / -0
    Which of the following is not true about air?
    Solution
    The statement which is not true about air is that it has a chemical formula. Air has no chemical formula. It is a mixture of gases.
    Hence, option D is correct.
  • Question 7
    1 / -0
    Oxygen is returned to the atmosphere mainly by :
    Solution
    During the process of photosynthesis, plants lead to the formation of complex sugars (food) using water and carbon dioxide in the presence of sunlight and release oxygen into the environment. 

    While processes like burning fuels and respiration release carbon dioxide into the air.
  • Question 8
    1 / -0
    To increase the percentage of oxygen in the atmosphere:
    Solution
    Planting more trees directly increases the oxygen amount by the process of photosynthesis in which oxygen is formed and releases into the atmosphere which in turn increases the percentage of oxygen in the atmosphere.
    Hence the option A is correct.
  • Question 9
    1 / -0
    Choose the correct alternative from the choice given for the following statements:
    Air consists of:
    Solution
    Answer is Option D.
    Air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon and hydrogen.
  • Question 10
    1 / -0
    Which of the following is common in combustion and aerobic respiration?
    Solution
    During the process of combustion and aerobic respiration:

    1. Oxidation takes place in the presence of oxygen.
    2. Liberation of energy.

    The release of heat and light is mostly limited to combustion.
    Respiration is a natural process whereas combustion can be either be a natural process or done by human efforts. Both combustion and aerobic respiration don't require nitrogen.

    Hence, the requirement of oxygen is common in both combustion and respiration.
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