LABORATORY REVIEW
TRANSPIRATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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the loss of water through the aerial parts of the plant
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the continuous column of water that moves up the xylem from roots to leaves
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the pull exerted on water up the xylem
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the evaporation of water from the leaves of a plant
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Detailed explanation-1: -In plants, the transpiration stream is the uninterrupted stream of water and solutes which is taken up by the roots and transported via the xylem to the leaves where it evaporates into the air/apoplast-interface of the substomatal cavity. It is driven by capillary action and in some plants by root pressure.
Detailed explanation-2: -As transpiration occurs, it deepens the meniscus of water in the leaf, creating negative pressure (also called tension or suction). The tension created by transpiration “pulls” water in the plant xylem, drawing the water upward in much the same way that you draw water upward when you suck on a straw.
Detailed explanation-3: -: the current of water usually containing many substances in solution that rises through the xylem of plants.
Detailed explanation-4: -This is called the cohesion–tension theory of sap ascent. The cohesion-tension theory explains how water moves up through the xylem. Inside the leaf at the cellular level, water on the surface of mesophyll cells saturates the cellulose microfibrils of the primary cell wall.
Detailed explanation-5: -Water moves from the roots to the leaves through tissue called the xylem, in a process called transpiration. As water evaporates out of the leaf, more water is ‘pulled upwards’ to replace what has been lost.