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Whether micro organisms are useful and h...

Whether micro organisms are useful and harmful. How explain.

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Knowledge Check

  • Heavy water is too micro-organisms because of

    A
    Its high molecular weight
    B
    Lesser chemical reactivity
    C
    Its hygroscopic nature
    D
    Greater density

  • (A): Same chemicals may be used as antiseptics as well as disinfectants. (R): A chemical which destroys micro organism can be used as an antiseptic in higher concentration and as disinfectant in lower concentration.

    A
    Both A & R are true, R is the correct explanation of A
    B
    Both A & R are true, R is not correct explanation of A
    C
    A is true, R is false
    D
    A is false, R is true

  • Ozone is useful in ______ and harmful in ___

    A
    Troposhere & Mesosphere
    B
    Mesosphere & Troposhere
    C
    Thermosphere & Stratosphere
    D
    Stratosphere & Troposhere

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