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    Chemistry
    Grade-6
    Easy

    Question

    The natural air filters from the following is:

    1. Rivers
    2. Trees
    3. Roads
    4. Mountains

    Hint:

    The organisms from where the food chain starts.

    The correct answer is: Trees

      The correct option is Trees.
      • Trees can absorb some pollutants during natural life processes common to all plants. In gas exchange, plants absorb carbon dioxide, turn it into food, and release oxygen. While these pores are opening normally, other elements can also enter. These include contaminants such as chlorine, sulfur dioxide, and fluoride.
      • Plants use some of these pollutants as nutrients and clean the air.
      • Another reason trees act as natural air filters is that they have thorns and hairs that can trap pollutants in their leaves.
      • More interestingly, the number of leaf stomata creates an electric charge that attracts airborne particles. Additionally, studies have found that coarse cracks in tree bark can trap and absorb pollutants.

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