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    Absorption by Roots - 2 - Absorption and Conduction by Roots - 1

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    Imbibition is the absorption of water by plant cells through surface attraction. Hydrophilic substances in the cell wall, like cellulose and proteins, absorb water causing the cells to swell. When seeds imbibe water during germination, the pressure causes the seed coat to rupture. Diffusion is the movement of molecules from an area of higher concentration to lower concentration without a membrane. Osmosis is diffusion of water through a semi-permeable membrane from an area of higher water concentration to lower. Endosmosis occurs when water moves into a cell through the membrane, while exosmosis is water moving out of a cell.

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    Absorption by Roots - 2 - Absorption and Conduction by Roots - 1

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    Imbibition is the absorption of water by plant cells through surface attraction. Hydrophilic substances in the cell wall, like cellulose and proteins, absorb water causing the cells to swell. When seeds imbibe water during germination, the pressure causes the seed coat to rupture. Diffusion is the movement of molecules from an area of higher concentration to lower concentration without a membrane. Osmosis is diffusion of water through a semi-permeable membrane from an area of higher water concentration to lower. Endosmosis occurs when water moves into a cell through the membrane, while exosmosis is water moving out of a cell.

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    02.+Absorption+by+Roots+-+2+_+Absorption+and+Conduction+by+Roots+-+1

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    Imbibition is the absorption of water by plant cells through surface attraction. Hydrophilic substances in the cell wall, like cellulose and proteins, absorb water causing the cells to swell. When seeds imbibe water during germination, the pressure causes the seed coat to rupture. Diffusion is the movement of molecules from an area of higher concentration to lower concentration without a membrane. Osmosis is diffusion of water through a semi-permeable membrane from an area of higher water concentration to lower. Endosmosis occurs when water moves into a cell through the membrane, while exosmosis is water moving out of a cell.

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    15 views36 pages

    Absorption by Roots - 2 - Absorption and Conduction by Roots - 1

    Uploaded by

    gaming channel gaming channel
    Imbibition is the absorption of water by plant cells through surface attraction. Hydrophilic substances in the cell wall, like cellulose and proteins, absorb water causing the cells to swell. When seeds imbibe water during germination, the pressure causes the seed coat to rupture. Diffusion is the movement of molecules from an area of higher concentration to lower concentration without a membrane. Osmosis is diffusion of water through a semi-permeable membrane from an area of higher water concentration to lower. Endosmosis occurs when water moves into a cell through the membrane, while exosmosis is water moving out of a cell.

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    Imbibition

    Imbibition is a phenomenon by which the living or dead plant cells absorb


    water by surface attraction
    Hydrophilic substance helps in Imbibition

    Peripheral
    membrane protein Integral membrane protein

    Substance made up of cellulose and protein or protein are hydrophilic.


    The hydrophilic substance swell up when it imbibes water.
    Seed Coat rupture due to Imbibition

    The seed coat ruptures due to imbibitional pressure when the seed is
    germinating
    Diffusion

    The molecules (solute or solvent, gas,, liquid) move freely in case of


    diffusion and the movement if from higher concentration to the region of
    lower concentration
    Osmosis

    Movement of water from region of higher concentration to lower through


    semipermeable membrane
    Endosmosis

    High water
    concentration

    Water moves
    inside

    Endosmosis is an inward diffusion of water through a semipermeable


    membrane when the surrounding solution is less concentrated. This tends
    to swell up the cell.
    Exosmosis

    High water
    concentration inside

    Water moves
    Low water
    outwards
    concentration
    outside

    Exosmosis is outward diffusion through a semipermeable membrane when


    the surrounding solution is more concentrated. This tends to cause
    shrinkage of cell.
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    Tonicity

    Relative concentration of the solutions that determine the direction and


    extent of diffusion is called tonicity.
    Isotonic

    Animal Plants

    ● The relative concentration of water molecules and the solute on


    either side of the cell membrane is the same.
    ● There was no net movement of water. (No osmosis)
    Hypotonic

    Animal Plants

    ● The solution outside the cell has a lower solute concentration than
    the fluids inside the cell.
    ● As a result, the water molecules from outside will move into cell
    (endosmosis)
    Hypertonic

    Animal Plants

    ● The solution outside the cell has a higher solute concentration than
    the fluid inside the cell.
    ● Due to this the water molecule from inside the cell moves out
    (exosmosis)
    Q. A plant cell placed in a certain
    solution got plasmolysed. What
    was the kind of solution?

    A. Isotonic sugar solution

    B. Hypotonic salt solution

    C. Hypertonic salt solution

    D. Isotonic salt solution


    Q. A plant cell placed in a certain
    solution got plasmolysed. What
    was the kind of solution?

    A. Isotonic sugar solution

    B. Hypotonic salt solution

    C. Hypertonic salt solution

    D. Isotonic salt solution


    Q. Movement of molecules of a
    substance from the region of their
    higher concentration to the region
    of their lower concentration
    without the involvement a
    separating membrane, is called

    A. Osmosis

    B. Diffusion

    C. active transport

    D. Capillarity
    Q. Movement of molecules of a
    substance from the region of their
    higher concentration to the region
    of their lower concentration
    without the involvement a
    separating membrane, is called

    A. Osmosis

    B. Diffusion

    C. active transport

    D. Capillarity
    Q. Osmosis and diffusion are the
    same except that osmosis there is:

    A. a freely permeable membrane

    B. a cell wall in between

    C. a selectively permeable
    membrane in between
    D. an endless inflow of water into a
    cell
    Q. Osmosis and diffusion are the
    same except that osmosis there is:

    A. a freely permeable membrane

    B. a cell wall in between

    C. a selectively permeable
    membrane in between
    D. an endless inflow of water into a
    cell
    Q. Absorption of water by the plant
    cells by surface attraction is called:

    A. Diffusion

    B. Osmosis

    C. Imbibition

    D. Endosmosis
    Q. Marine fish when thrown under
    tap water bursts because of

    A. Endosmosis

    B. Exosmosis

    C. Diffusion

    D. Plasmolysis
    Q. Marine fish when thrown under
    tap water bursts because of

    A. Endosmosis

    B. Exosmosis

    C. Diffusion

    D. Plasmolysis
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