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Air around Us T...

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  • Question 1
    1 / -0

    Second most abundant constituent of dry air in terms of volume after nitrogen is:

  • Question 2
    1 / -0

    Plant absorb ________ to make their own food.

  • Question 3
    1 / -0

    Balance of oxygen and carbon dioxide in atmosphere is maintained by:

  • 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 

  • Question 5
    1 / -0

    Which does not need help of air in its movement?

  • Question 6
    1 / -0

    Which of the following is not true about air?

  • Question 7
    1 / -0

    Oxygen is returned to the atmosphere mainly by :

  • Question 8
    1 / -0

    To increase the percentage of oxygen in the atmosphere:

  • Question 9
    1 / -0

    Choose the correct alternative from the choice given for the following statements:
    Air consists of:

  • Question 10
    1 / -0

    Which of the following is common in combustion and aerobic respiration?

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