LABORATORY REVIEW
TRANSPIRATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Food and minerals are carried throughout the plant by the xylem.
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Evaporation drags the water’s vapor from the plant into the soil.
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Evaporation creates a force that pulls water up into the plant from its roots.
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Food and minerals are carried up from the roots by the phloem.
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Detailed explanation-1: -Answer: Solution: Transpiration process in plants creates a suction pressure which pulls up water from the xylem of the roots to the stem and then to the leaves. Xylem tissues are in the form of capillary tubes (tracheids and fibres) where narrower the diameter, greater will be the force.
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 water evaporates through the stomata present on surface of leaves by the process of transpiration.
Detailed explanation-4: -The forces of cohesion and adhesion cause the water molecules to form a column in the xylem. Water moves from the xylem into the mesophyll cells, evaporates from their surfaces and leaves the plant by diffusion through the stomata.
Detailed explanation-5: -Evapotranspiration includes water evaporation into the atmosphere from the soil surface, evaporation from the capillary fringe of the groundwater table, and evaporation from water bodies on land. Evapotranspiration also includes transpiration, which is the water movement from the soil to the atmosphere via plants.