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    ​Leaves can alter the intracellular distribution of their chloroplasts in response to changing light conditions. Shown below are schematic diagrams of
    Question

    Leaves can alter the intracellular distribution of their chloroplasts in response to changing light conditions. Shown below are schematic diagrams of chloroplast distribution patterns in palisade cells of Arabidopsis, in response to different light intensities, grown in a growth chamber having a light source from the top.

    Which one of the following combinations correctly matches the chloroplast distribution with its corresponding light intensity?

    A.

    A = High light; B = Darkness; C = Low light

    B.

    A = Darkness; B = High light; C = Low light

    C.

    A = Low light; B = Darkness; C = High light

    D.

    A = High light; B = Low light; C = Darkness

    Correct option is C

    EXPLANATION-

    Figure A:
    Chloroplasts are located along the upper and lower cell walls, directly facing the incident light.
    This suggests low light, where the plant maximizes light capture.

    Figure B:
    Chloroplasts are clumped at the bottom.
    This is consistent with darkness, where light orientation isn’t a factor, and chloroplasts settle.

    Figure C:
    Chloroplasts are located only on the side walls, avoiding the top surface where light enters.
    This indicates high light, as chloroplasts are trying to avoid photodamage by minimizing exposure.

    So, the correct option is (c) - A = Low light; B = Darkness; C = High light

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