OBJECTIVE LIFE SCIENCE
DIVERSITY AMONG LIFE FORMS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Water moves up through the xylem.
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Water moves up through the phloem.
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Water moves up through the vacuoles.
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Water moves up through the epidermis.
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Detailed explanation-1: -The bulk of water absorbed and transported through plants is moved by negative pressure generated by the evaporation of water from the leaves (i.e., transpiration)-this process is commonly referred to as the Cohesion-Tension (C-T) mechanism.
Detailed explanation-2: -Water is passively transported into the roots and then into the xylem via cells of cortex. Plants absorb water from the soil by osmosis. Root hair cells are adapted for this by having a large surface area to speed up osmosis. The forces of cohesion and adhesion cause the water molecules to form a column in the xylem.
Detailed explanation-3: -Water and mineral nutrients–the so-called sap flow–travel from the roots to the top of the tree within a layer of wood found under the bark. This sapwood consists of conductive tissue called xylem (made up of small pipe-like cells).