Explanation and definition of transpiration, significance of transpiration. Start studying Biology Root Pressure, Transpirational Pull and Pressure Flow. Root pressure – definition and experiment to demonstrate it. ... the rhizosphere represents a highly significant interface between biology and geology, an interfacial environment with broad consequences for earth's biogeochemistry and soil formation. 1 decade ago. Pronunciation: — Bot. transpiration is the loss of water from the aerial parts of the plants body. How to pronounce, definition … It is caused by active transport of mineral nutrient ions into the root xylem. root pressure is the difference in concentration between the root and the external surroundings. ... Plant Biology osmotic pressure within the cells of a root system that causes sap to rise through a plant stem to the leaves. for distance learning. The total turgor pressure of the cortex tissue as a result of which water enters the xylem vessels through endoderm is called root pressure. Dictionary > Index R; Cite. When transpiration is high, xylem sap is usually under tension, rather than under pressure, due to transpirational pull.At night in some plants, root pressure causes guttation or exudation of drops of xylem sap from the tips or edges of leaves. Glossary of biology terms . Pressure potential definition and explanation in biology. Meaning and definition of root pressure : The upward push of water within the stele of vascular plants, caused by active pumping of minerals into the xylem by root … n. Pressure exerted in the roots of a plant as the result of water entering the roots through osmosis. The pressure (the result of osmosis) exerted by the roots of vascular plants that moves water into the leaves and causes guttation.. Root pressure Meaning. 0 0. root pressure synonyms, root pressure pronunciation, root pressure translation, English dictionary definition of root pressure. Find definitions for: root' pres"sure. Root pressure, in plants, the force that helps to drive fluids upward into the water-conducting vessels (xylem). Study online pressure potential explanation with biology terms to prepare course for online degree programs. Mechanism of ascent of sap by cohesion – tension and … root pressure: Meaning and Definition of. Root pressure occurs in the xylem of some vascular plants when the soil moisture level is high either at night or when transpiration is low during the day. The key difference between root pressure and transpiration pull is that root pressure is the osmotic pressure developing in the root cells due to movement of water from soil solution to root cells while transpiration pull is the negative pressure developing at the top of the plant due to the evaporation of water from the surfaces of mesophyll cells. Source(s): biology definition root pressure transpiration regard plants: https://tr.im/mCI44. Root pressure is the lesser force and is important mainly in small plants at times when transpiration is not substantial, e.g., at nights. All Free. Bot. 1870–75; Forum discussions with the word(s) "root pressure" in the title: No titles with the word(s) "root pressure". Root preesure is the pressure developed in the roots due to continued inward movement of water through cell-to-cell osmosis which helps in the ascent of cell sap upward through the stem. 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