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Topics related to "A classroom demonstration of temperature amp wind effects on plant transpiration"

transpiration transpiration
transpiration in botany, the loss of water by evaporation in terrestrial plants. Some evaporation occurs directly through the exposed walls of surface cells, but the greatest amount takes place through the stomates, or intercellular spaces (see leaf ). Transpiration functions to effect the ascent... Read more
Julius von Sachs Julius von Sachs
Julius von Sachs , 1832-97, German botanist. A professor at the Univ. of Würzburg from 1868, he was a founder of experimental plant physiology. He demonstrated the importance of transpiration in plants and the role of chlorophyll; his researches on plant metabolism were a major contribution. He... Read more
root pressure root pressure
root pressure The pressure that forces water, absorbed from the soil, to move through the roots and up the stem of a plant. This pressure can be demonstrated by cutting a stem, from which water will exude. A manometer can be attached to a plant stem to measure the root pressure. Root pressure is... Read more
xerophyte xerophyte
xerophyte A plant that is adapted to live in conditions in which there is either a scarcity of water in the soil, or the atmosphere is dry enough to provoke excessive transpiration, or both. Xerophytes have special structural (xeromorphic) and functional modifications, including swollen... Read more
guttation guttation
guttation The extrusion of water and sometimes salts from the aerial parts of plants, particularly at night when transpiration rates are low. Guttation may occur in plants that are less than about 10 m tall, where hydrostatic pressure is insufficient to prevent the flow of water into the xylem when... Read more
hydathode hydathode
hydathode A pore found in the epidermis of the leaves of certain plants. Like stomata, hydathodes are surrounded by two crescent-shaped cells but these, unlike guard cells, do not regulate the size of the aperture. Hydathodes are used by the plant to secrete water under conditions in which... Read more
pressure potential pressure potential
pressure potential Symbol Ψp. The component of water potential due to the hydrostatic pressure that is exerted on water in a cell. In turgid plant cells it usually has a positive value as the entry of water causes the protoplast to push against the cell wall (see turgor). In xylem cells there... Read more
wilting wilting
wilting The condition that arises in plants when more water is lost by evaporation than is absorbed from the soil. This causes the cells to lose their turgor and the plant structure droops. Plants can normally recover from wilting if water is added to the soil, but permanent wilting and possible... Read more
Stephen Hales Stephen Hales
Stephen Hales 1677-1761, English physiologist and clergyman. From 1709 he was perpetual curate of Teddington. His experimental studies in animal and plant physiology contributed greatly to the progress of science. In his investigations of circulation he made the first measurements of blood pressure... Read more
Senescence Senescence
Senescence Senescence refers to all of the changes that take place in a plant that will finally lead to the death of cells, tissues, and, eventually, the whole plant body. These changes can be seen to occur in some cells even in very young, vigorously growing plants. For... Read more

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