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.