LABORATORY REVIEW
TRANSPIRATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The water loss from plants in liquid form through stoma on the surface of the leaves.
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The water loss from plants in liquid form through hydathodes(opening) at the edge of the leaves.
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The water loss from plants in the form of water vapour through hydathodes(opening) at the edge of the leaves.
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Detailed explanation-1: -Solution: Guttation is the loss of water in the form of droplets from the margins of leaves of intact plants through special pores known as hydathodes. The stomata remain closed during the night and hence transpiration does not occur during the night.
Detailed explanation-2: -Hydathodes are also known as open water pores. These are present at the margins of leaf epidermis. It is the pore at which small xylem vessels of veins of leaves open. When there is positive root pressure of water, the water comes out of these pores by the process called Guttation.
Detailed explanation-3: -Guttation is the process of secretion of water droplets from the pores of some vascular plants like grass. Guttation is often confused with dew droplets that condense from the atmosphere onto the plant’s surface.
Detailed explanation-4: -As explained in Chapter 1, guttation is the process of exudation of liquid through permanently open pores called hydathodes located at the tips, edges, and surfaces of uninjured leaves in a wide range of plant species (Singh and Singh 2013; Singh 2013, 2014a, b, 2016a, b).
Detailed explanation-5: -Guttation is the exudation of drops of xylem sap on the tips or edges of leaves of some vascular plants, such as grasses, and a number of fungi, which are not plants but were previously categorized as such and studied as part of botany.