It is primarily generated by osmotic pressure in the cells of the roots and can be demonstrated by exudation of fluid when the stem is cut off just aboveground. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Root pressure is osmotic pressure within the cells of a root system that causes sap to rise through a plant stem to the leaves. n. Pressure exerted in the roots of a plant as the result of water entering the roots through osmosis. Root pressure Occurrence. root pressure synonyms, root pressure pronunciation, root pressure translation, English dictionary definition of root pressure. 'Root Pressure'. : the chiefly osmotic pressure by which water rises into the stems of plants from the roots. P Physics Force applied uniformly over a surface, measured as force per unit area. Pressure differential is the pressure difference that exists between points. Root pressure is the pressure developed in the roots due to the inflow of water, brought about due to the alternate turgidity and flaccidity of the cells of the cortex and the root hair cell, which helps in pushing the plant sap upwards. It also describes the fluid force that exists per each unit and is measured in pounds per square inch (PSI). First appearance: Post the Definition of root pressure to Facebook, Share the Definition of root pressure on Twitter. pressure (n.) late 14c., "suffering, anguish; act or fact of pressing on the mind or heart," from Old French presseure "oppression; torture; anguish; press" (for wine or cheeses), "instrument of torture" (12c.) The act of pressing. …pushed up the stem by root pressure. Origin of root pressure. Definition of under pressure in the Idioms Dictionary. See more. The root pressure is partially responsible for the rise of water in vascular plants, though it alone is insufficient for the movement of sap against the force of gravity, especially within the tallest trees. The intensity depends on the average of the pressure squared so it is that average which must be used. The causes of low blood pressure can range from dehydratio… transpiration is the loss of water from the aerial parts of the plants body. In severe cases, low blood pressure can be life-threatening. The application of continuous force by one body on another that it is touching; compression. Bedsores — also called pressure ulcers and decubitus ulcers — are injuries to skin and underlying tissue resulting from prolonged pressure on the skin. Root pressure, in plants, a force that helps to drive fluids upward from the soil into the water-conducting xylem vessels. The condition of being pressed. Can you spell these 10 commonly misspelled words? This article was most recently revised and updated by, https://www.britannica.com/science/root-pressure. Definitions by the largest Idiom Dictionary. 2. Osmotic Pressure Definition. It does this in order to promote or discourage nutrient uptake. Hypotension: Any blood pressure that is below the normal expected for an individual in a given environment. Root pressure. Root pressure is the transverse osmotic pressure within the cells of a root system that causes sap to rise through a plant stem to the leaves. However, for many people, abnormally low blood pressure (hypotension) can cause dizziness and fainting. The RMS value of a set of values (or a continuous-time waveform) is the square root of the arithmetic mean of the squares of the values, or the square of the function that defines the continuous waveform.In physics, the RMS current value can also be defined as the "value of the direct current that dissipates the same power in a resistor." It is the transverse osmotic pressure within the cells of a root system that causes sap to rise through a plant stem to the leaves. Did You Know? RCA assumes that it is much more effective to systematically prevent and solve for underlying issues rather than just treating ad hoc symptoms and putting out fires. Anonymous. root in cross section. 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 phenomenon is produced by the root cells having a solute concentration gradient which increases from outside the root towards the centre of the root. Our editors will review what you’ve submitted and determine whether to revise the article. Root pressure is partially responsible for the rise of water in plants, but it cannot alone account for the transport of water to the top of tall trees. Medical Definition of Root pressure. Pressure produced in the roots of plants, causing exudation of sap from cut stems and guttation of water from leaves. The root pressure is more where water content is more. The pressure is generated by the concentration of solutes in the xylem of the root and stem, which in turn causes water to move into the xylem by osmosis. “Root pressure.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/root%20pressure. This is highly relevant for day-to-day pressure measurement, especially in industry. Hypertension definition is - abnormally high blood pressure and especially arterial blood pressure. 1. Definition of root pressure. Osmotic pressure can be thought of as the pressure that would be required to stop water from diffusing through a barrier by osmosis.In other words, it refers to how hard the water would “push” to get through the barrier in order to diffuse to the other side. In mangrove trees, which grape on semi-mud-water soil, the root pressure is more than the black soil which has among the least fluid content or density. Root pressure Explanation. Meteorology Atmospheric pressure. See also cohesion hypothesis. Infoplease is a reference and learning site, combining the contents of an encyclopedia, a dictionary, an atlas and several almanacs loaded with facts. This process is produced by osmotic pressure in the cells of the root. Root pressure is the pressure developed in the roots due to the inflow of water, brought about due to the alternate turgidity and flaccidity of the cells of the cortex and the root hair cell, which helps in pushing the plant sap upwards. What does under pressure expression mean? All Free. 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 cells. Please tell us where you read or heard it (including the quote, if possible). Definition of root pressure words . Root pressure is osmotic pressure within the cells of a root system that causes sap to rise through a plant stem to the leaves. 1; Just one definition for root pressure . 'All Intensive Purposes' or 'All Intents and Purposes'? Infoplease knows the value of having sources you can trust. Omissions? Hypertension Definition Hypertension is high blood pressure. Define root pressure. 'Nip it in the butt' or 'Nip it in the bud'. Learn vocabulary, terms, and more with flashcards, games, and other study tools. and directly from Latin pressura "action of pressing," from pressus, past participle of premere "to press, hold fast, cover, crowd, compress" (from PIE root *per-(4) "to strike"). He's making a quiz, and checking it twice... Test your knowledge of the words of the year. Test Your Knowledge - and learn some interesting things along the way. 0 0. Let us know if you have suggestions to improve this article (requires login). Abbr. Bedsores most often develop on skin that covers bony areas of the body, such as the heels, ankles, hips and tailbone.People most at risk of bedsores are those with a medical condition that limits their ability to change positions or those who spend most of their time in a bed or chair.… root pressure - WordReference English dictionary, questions, discussion and forums. Taking the squared bit out of the log bracket leaves you, as you have noted, with the rms pressure which is not the same as the mean of the magnitude of the pressure. Low blood pressure might seem desirable, and for some people, it causes no problems. The hydrostatic pressure generated in the roots of a plant, which helps the sap to rise in the xylem. 1 decade ago. Source(s): biology definition root pressure transpiration regard plants: https://tr.im/mCI44. 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