1.

    A researcher observes that water absorption by roots is significantly reduced when the plant is treated with a respiratory inhibitor. Which of the following best explains this observation?

    A

    Respiratory inhibitors directly block aquaporin function, preventing water movement.

    B

    Respiration is essential for maintaining root cell turgidity, which is directly linked to water absorption.

    C

    Active transport of ions into the root cells requires energy, creating a water potential gradient that drives water uptake.

    D

    Inhibition of respiration disrupts the cohesion-tension theory, preventing water movement through the xylem.

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    2.

    Ascent of sap is

    A

        Active and requires energy expenditure by the soil

    B

    Passive, and no requirement of energy by the plants

    C

    Active and requires energy expenditure by the plants

    D

        Passive unless soil is dry

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    5.

    Why all the minerals present in soil can not be passively absorbed by roots?

    A

    Mineral existence as ions is more than absorption

    B

        Due to less concentration of ion in root interior than soil

    C

    Due to more concentration of ions in root interior than in soil

    D

    None of the above

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    6.

    Why all the minerals present in soil can not be passively absorbed by roots?

    A

    Mineral existence as ions is more than absorption

    B

        Due to less concentration of ion in root interior than soil

    C

    Due to more concentration of ions in root interior than in soil

    D

    None of the above

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