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Elevate Middle Grade Science 2019 Life Student EditionPrentice Hall 386 solutions How does water move up the xylem against gravity?Once water is in the xylem, it travels upwards - against the force of gravity - towards the rest of the plant. Water is able to move against gravity due to two forces: tension and cohesion. Tension is a 'sucking force' which is created when water evaporates from leaves (transpiration), pulling more water into the leaf.
What is the major mechanism for moving xylem sap from the roots to the leaves?Cohesion-tension essentially combines the process of capillary action with transpiration, or the evaporation of water from the plant stomata. Transpiration is ultimately the main driver of water movement in xylem.
How does xylem sap move?Xylem sap flows upward to veins that branch throughout each leaf, providing each with water. Plants loose an astonishing amount of water by transpiration, the loss of water vapor from leaves and other aerial parts of the plant.
What causes movement of xylem sap?The cohesion – tension theory of sap ascent explains how how water is pulled up from the roots to the top of the plant. Evaporation from mesophyll cells in the leaves produces a negative water potential gradient that causes water and minerals to move upwards from the roots through the xylem.
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Which of the following mechanisms best explains how xylem sap moves up against the downward pull of gravity?
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