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    Which of the following processes helps the plant in the absorption and upward movement of water and minerals dissolved in it from the roots to the lea
    Question

    Which of the following processes helps the plant in the absorption and upward movement of water and minerals dissolved in it from the roots to the leaves?

    A.

    Photosynthesis

    B.

    Transpiration

    C.

    Translocation

    D.

    Evaporation

    Correct option is B

    The correct answer is (B) Transpiration

    Explanation:
    • Transpiration is the loss of water vapor from the aerial parts of a plant, primarily through tiny pores on the leaves called stomata.
    • This evaporation creates a continuous negative pressure or suction pull—known as a transpiration pull—that draws water and dissolved mineral nutrients upward from the roots through the xylem vessels to the upper parts of the plant.
    • Beyond driving nutrient transport, transpiration helps regulate the plant's internal temperature, cooling it down hot weather through evaporative cooling.

    Information Booster:
    • The 'Cohesion-Tension Theory' explains how transpiration pull works, relying on the strong mutual attraction between water molecules (cohesion) to pull up long, unbroken columns of water through the plant.

    Additional Knowledge:
    • Photosynthesis (Option A): The metabolic process by which green plants use sunlight, water, and carbon dioxide to synthesize food (carbohydrates), releasing oxygen as a byproduct.
    • Translocation (Option C): The movement of soluble organic food materials (like sucrose) from the leaves, where they are made, to storage organs and growing parts of the plant via the phloem tissue.
    • Evaporation (Option D): A general physical process where liquid water turns into vapor from any exposed surface; it is not a specialized biological mechanism regulated by plant tissues.

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