xylem pressure potential

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• Xylem — Multiple cross sections of a flowering plant stem showing primary and secondary xylem and phloem[1] Xylem is one of the two types of transport tissue in vascular plants. (Phloem is the other). The word xylem is derived from the Classical Greek… …   Wikipedia

• Root pressure — Root pressure: osmotic pressure within the cells of a root system that causes sap to rise through a plant stem to the leaves.Root pressure occurs in the xylem of some vascular plants when the soil moisture level is high either at night or when… …   Wikipedia

• Water potential — is the potential energy of water per unit volume relative to pure water in reference conditions. Water potential quantifies the tendency of water to move from one area to another due to osmosis, gravity, mechanical pressure, or matrix effects… …   Wikipedia

• angiosperm — /an jee euh sperrm /, n. Bot. a plant having its seeds enclosed in an ovary; a flowering plant. Cf. gymnosperm. [ANGIO + SPERM] * * * ▪ plant Introduction       any member of the more than 300,000 species of flowering plants (division Anthophyta) …   Universalium

• Evolutionary history of plants — Plants have evolved through increasing levels of complexity, from the earliest algal mats, through bryophytes, lycopods, ferns and gymnosperms to the complex angiosperms of today. While the simple plants continue to thrive, especially in the… …   Wikipedia

• Properties of water — H2O and HOH redirect here. For other uses, see H2O (disambiguation) and HOH (disambiguation). This article is about the physical and chemical properties of pure water. For general discussion and its distribution and importance in life, see Water …   Wikipedia

• Magnesium in biology — Magnesium is an essential element in biological systems. Magnesium occurs typically as the Mg2+ ion. It is an essential mineral nutrient for life[1][2][3] and is present in every cell type in every organism. For example, ATP (adenosine… …   Wikipedia

• Osmotisch — Als Osmose (von griechisch ὠσμός, ōsmós = „Eindringen, Stoß, Schub, Antrieb“) wird in den Naturwissenschaften der gerichtete Fluss von Molekülen durch eine semipermeable (auch: selektiv permeable) Membran bezeichnet. Osmose ist für viele Abläufe… …   Deutsch Wikipedia

• Osmotischer Druck — Als Osmose (von griechisch ὠσμός, ōsmós = „Eindringen, Stoß, Schub, Antrieb“) wird in den Naturwissenschaften der gerichtete Fluss von Molekülen durch eine semipermeable (auch: selektiv permeable) Membran bezeichnet. Osmose ist für viele Abläufe… …   Deutsch Wikipedia

• Salzkraft — Als Osmose (von griechisch ὠσμός, ōsmós = „Eindringen, Stoß, Schub, Antrieb“) wird in den Naturwissenschaften der gerichtete Fluss von Molekülen durch eine semipermeable (auch: selektiv permeable) Membran bezeichnet. Osmose ist für viele Abläufe… …   Deutsch Wikipedia

• wood — wood1 woodless, adj. /wood/, n. 1. the hard, fibrous substance composing most of the stem and branches of a tree or shrub, and lying beneath the bark; the xylem. 2. the trunks or main stems of trees as suitable for architectural and other… …   Universalium