…flow exerts a force, called root pressure, that helps drive the water through the roots. Root pressure occurs in the xylem of some vascular plants when the soil moisture level is high either at night or … Source(s): biology definition root pressure transpiration regard plants: https://tr.im/mCI44. 1 decade ago. The hydrostatic pressure generated in the roots of a plant, which helps the sap to rise in the xylem. What made you want to look up root pressure? A blood pressure reading lower than 90 millimeters of mercury (mm Hg) for the top number (systolic) or 60 mm Hg for the bottom number (diastolic) is generally considered low blood pressure. Pressure differential is the pressure difference that exists between points. “Root pressure.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/root%20pressure. Origin of root pressure. Root pressure is basically the idea that a plant's roots can either maintain a higher or lower pressure based on its surroundings. Infoplease knows the value of having sources you can trust. 0 0. The condition of being pressed. More from Merriam-Webster on root pressure, Britannica.com: Encyclopedia article about root pressure. Start studying Biology Root Pressure, Transpirational Pull and Pressure Flow. sure (prĕsh′ər) n. 1. a. root pressure. It also describes the fluid force that exists per each unit and is measured in pounds per square inch (PSI). 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. Hypotension: Any blood pressure that is below the normal expected for an individual in a given environment. P Physics Force applied uniformly over a surface, measured as force per unit area. What does under pressure expression mean? Bedsores — also called pressure ulcers and decubitus ulcers — are injuries to skin and underlying tissue resulting from prolonged pressure on the skin. See also cohesion hypothesis. Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... Water diffusing into the roots from the surrounding soil rises through the trunk and the branches of the tree before transpiring through the leaves. Definition. Accessed 22 Dec. 2020. 'Nip it in the butt' or 'Nip it in the bud'. This is highly relevant for day-to-day pressure measurement, especially in industry. Abbr. Root pressure - definition. Learn a new word every day. Post the Definition of root pressure to Facebook, Share the Definition of root pressure on Twitter. Root pressure Explanation. : the chiefly osmotic pressure by which water rises into the stems of plants from the roots. 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. Root pressure. First appearance: 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." Test Your Knowledge - and learn some interesting things along the way. 5. a. Anonymous. Pressure produced in the roots of plants, causing exudation of sap from cut stems and guttation of water from leaves. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. All Free. Root pressure is a force or the hydrostatic pressure generated in the roots that help in driving the fluids and other ions from the soil in upwards directions into the plant’s vascular tissue – Xylem. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! …pushed up the stem by root pressure. b. 1. 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. 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. However, for many people, abnormally low blood pressure (hypotension) can cause dizziness and fainting. 0 0. 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.… Medical Definition of Root pressure. 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. Define root pressure. Pressure in the roots which, when the shoot is cut off, will cause liquid to ooze from the root stump, the mechanisms and tissues involved in this process are not clearly understood. 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. 3. Root pressure, in plants, force that helps to drive fluids upward into the water-conducting vessels (xylem). How to use hypertension in a sentence. root pressure a force exerted within a plant root that pushes water up towards the stem. Omissions? Did You Know? under pressure phrase. Definition of root pressure. 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. 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. transpiration is the loss of water from the aerial parts of the plants body. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Corrections? Our editors will review what you’ve submitted and determine whether to revise the article. See more. In nature, these conditions may be met in early spring before the leaves emerge, when the soil is wet and transpiration is…. Hypertension definition is - abnormally high blood pressure and especially arterial blood pressure. Osmotic Pressure Definition. He's making a quiz, and checking it twice... Test your knowledge of the words of the year. Furthermore, the fact that root pressures tend to be lowest when water loss from leaves (transpiration) is highest, which is exactly when plants most need water, shows that root pressure is not driving sap movement. Please tell us where you read or heard it (including the quote, if possible). Meteorology Atmospheric pressure. Definition of root pressure words . Can you spell these 10 commonly misspelled words? The intensity depends on the average of the pressure squared so it is that average which must be used. 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