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    Mention two biological phenomena regulated by osmosis in plants and animals.

    Answer:

    (i) Plants absorb water from the soil through their roots due to osmosis.
    (ii) In animals, water moves into different parts of body due to osmosis.

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    10 mL of a liquid A was mixed with 10 mL of liquid B. The volume of resulting solution was found to be 19.9 mL. What do you conclude?
    Answer:

    It shows that solution is non ideal showing – ve deviation in which force of attraction increases, volume decreases.
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    What happens if pressure greater than osmotic pressure is applied on the solution separated by a semi-permeable membrane from the solvent?
    Answer:

    On applying  greater pressure than osmotic pressure the reverse phenomenon takes place. 
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    Answer
    Ethanol is an organic compound, yet it is freely miscible with water. Why?
    Answer:

    Ethanol is a polar oragnic compound thus it form hydrogen bond with water.
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    In cold countries, ethylene glycol is added to water radiators of cars during winter. Why?

    Answer:

    This causes lowering in freezing point of water and therefore water does not freeze in radiators.
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