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Why is ozone layer in stratosphere called a protective layer ? Write a short note on the causes and effects of ozone depletion.

Ozone layer as protective layer. The ozone layer in the stratosphere is very useful to human beings because it absorbs the major part of harmful ultraviolet radiation coming from the sun. Therefore, it is called protective layer.
However, it has been observed that the ozone layer is getting depleted. One of the reasons for depletion of ozone layer is action of chloroflorocarbons(CFCs) and aerosol spray propellants. These compounds react with ozone gas in the atmosphere thereby depleting it. If the ozone layer in the atmosphere is significantly decreased, these harmful radiations would reach the earth and cause many damages such as skin cancer, genetic disorders in man and other living forms. 
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    Write “True” or “False” :

    A.

    The CO2 causes asphyxial death due to oxygen starvation.

    B.

    Acid rain caused due to oxides of nitrogen and sulphur.

    C.

    Ozone destroys the crops of potato, alfalfa and spinach.

    D.

    The UV rays and IR rays are ionising radiations.

    E.

    The photochemical smog contains PAN and Ozone.
    Answer
    Write about the contribution of Ahmed Khan to reduce the amount of plastic waste.
    Answer
    Why is the use of unleaded petrol recommended for motor vehicles equipped with catalytic converters ?
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    A factory drains its waste water into the nearby lake causing algal bloom.

    (a) How was the algal bloom caused ?

    (b) What would be the consequences ?

    (c) Give the term for the cause of it.

    Answer
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