1.

    Which of the following is NOT an example of diffusion?

    A

    The spread of perfume in a room

    B

    Movement of oxygen from lungs into the blood

    C

    Water being pumped up the stem of a plant

    D

    Spread of ink in a beaker of water

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    4.

    Following statements are related with the diffusion of coloured molecules across a membrane. Select the correct statement, which shows the fastest rate of diffusion?

    A

    An internal concentration of 15% and external concentration of 10%

    B

    An internal concentration of 25% and external concentration of 50%

    C

    An internal concentration of 50% and external concentration of 25%

    D

    Both (2) and (3) shows fastest rate of diffusion

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