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Plant Cells: Biology #6

Plant Cells: Biology #6

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Transpiration This article is about plant transpiration. For transpiration in human and animal physiology, see Sweating and Hyperhydrosis. Overview of transpiration: Water is passively transported into the roots and then into the xylem.The forces of cohesion and adhesion cause the water molecules to form a column in the xylem.Water moves from the xylem into the mesophyll cells, evaporates from their surfaces and leaves the plant by diffusion through the stomata Transpiration is the process of water movement through a plant and its evaporation from aerial parts, such as leaves, stems and flowers. Water is necessary for plants but only a small amount of water taken up by the roots is used for growth and metabolism.

The beautiful tricks of flowers - Jonathan Driori In literature and music, flowers have long been associated with love. The poet Pablo Neruda, for example, wrote “In the spring, love, / I want your laughter like / the flower I was waiting for.” Robert Burns penned the famous phrase “My love is like a red, red rose / That’s newly sprung in June.” (But before you get carried away with the romance, remember Whitesnake’s admonition that “Every rose has its thorn.”)

Evapotranspiration - The Water Cycle, from USGS Water-Science School Evapotranspiration is the sum of evaporation from the land surface plus transpiration from plants. Precipitation is the source of all water.Credit: Salinity Management Guide What is evapotranspiration? If you search for the definition of evapotranspiration, you will find that it varies. In general, evapotranspiration is the sum of evaporation and transpiration. Some definitions include evaporation from surface-water bodies, even the oceans. The Movement of Water in a Plant Now how do mineral nutrients get into a root? Plants need calcium to make their cell walls. They use potassium in the guard cells around the stomata to regulate gas exchange, so potassium is critical to the plant's water balance. The chlorophyll molecule that is part of the electron transport chain in photosynthesis needs magnesium. Most plants acquire these nutrients from the soil, which requires active transport. It takes energy for a root to absorb minerals from the soil, and ATP is needed to do this.

Transpiration How does water move from the soil all the way up the stem and then into the leaves? It may move just a few inches, a few feet, or one hundred feet or more in a large tree. We discussed the special chemical properties of water in Lesson 2. Remember that water is cohesive—water molecules will stick to each other through hydrogen bonds. Potometer A potometer (from Greek ποτό = drunken, and μέτρο = measure) —sometimes known as a transpirometer— is a device used for measuring the rate of water uptake of a leafy shoot. The causes of water uptake are photosynthesis and transpiration.[1] Everything must be completely water tight so that no leakage of water occurs. There are two main types of potometers used - the bubble potometer (as detailed below), and the mass potometer. The mass potometer consists of a plant with its root submerged in a beaker.

Harvesting the Rare Earth – We Make Money Not Art Jacob Remin, Harvesting the Rare Earth, 2017. Photo: Anders Sune Berg Rare Earth elements (or RREs) are a group of 17 metallic elements essential to sustaining the unrelenting global demand for new technological products. The materials have specific chemical and physical properties that make them useful in improving the performance of pretty much anything we associate with innovation nowadays: hybrid cars, smartphones, laptops, hi-tech televisions, sunglasses, lasers as well as less mainstream technology used by the military and medical profession. Rare earths are extracted through opencast mining, they also generate radioactive waste and need be separated and purified at high ecological costs.

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