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What Is The Function Of Xylem And Phloem In Plants

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Micro Computed Tomography For The Identification And Characterization Of Archaeological Lime Bark

Phloem, the vascular tissue of the plant that conducts the food produced in the leaves during photosynthesis to all other parts of the plant. Phloem is composed of various specialized cells called sieve elements, phloem fibers and phloem parenchyma cells. Along with xylem (the tissue that conducts water and minerals from the roots to the rest of the plant), phloem is found in all vascular plants, including mosses, ferns and seedless horsetails, as well as all angiosperms (flowering plants) and gymnosperms (plants with seeds not enclosed in an ovary).

Sieve tubes, which are columns of tubular sieve cells with perforated sieve-like areas in their side or end walls, provide the main channels through which food substances move throughout the vascular plant. Phloem parenchyma cells, called transfer cells and border parenchyma cells, are located near the finest branches and endings of sieve tubes in leaf veins, where they also function in food transport. Companion cells, or albumen cells in non-flowering vascular plants, are another specialized type of parenchyma and perform the cellular functions of adjacent sieve elements; they usually have a higher number of mitochondria and ribosomes than other parenchyma cells. Phloem or bast fibers are long flexible sclerenchyma cells that make up the soft fibers (eg flax and hemp) of commerce. They provide flexible tensile strength to the phloem tissues. Sclerids, also formed for sclerenchyma, are irregularly shaped hard cells that add compressive strength to tissues.

Primary phloem consists of the apical meristems (areas of new cell production) of root and shoot tips; it can be either protophloem, whose cells mature before elongation (during growth) of the zone in which it is located, or metaphloem, whose cells mature after elongation. The protophloem sieve tubes cannot stretch with the elongated tissues and are broken and destroyed as the plant ages. The other types of phloem cells can be converted into fibers. The later maturing metaphloem is not destroyed and may function throughout the life of the plant in plants such as palms, but is replaced by secondary phloem in plants that have a cambium. Provide details of what you need help with, along with a budget and time limit. . Questions are posted anonymously and can be 100% private.

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Chapter 29. Plant Structure And Function: Moving Photosynthesis Onto Land

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Xylem & Phloem (8.1.1)

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Transport in plants – functions of xylem and phloem Plants have transport systems to move food, water and minerals around. These systems use continuous tubes called xylem and phloem: – Xylem vessels carry water and minerals from the roots to the leaves – Phloem tubes carry sugar and other organic nutrients obtained by the plant from the leaves to the rest of the plant. Structure of Xylem Tissue Xylem vessels consist of dead cells. They have a thick, hardened, lignin-deposited cellulose cell wall with an empty lumen. The end walls of the cells have disappeared, so a long, open tube is formed. The walls of the xylem vessel contain holes called pits through which water enters. The xylem vessel specializes in transporting water and dissolved minerals from the root to all other parts of the plant and also helps to support and strengthen the stem. Structure of Phloem Tissue This is a long tube that runs past the xylem tissue. They are made of long narrow tubes with sieve plates perforated along the thin length. The function of phloem tissue is to transport food nutrients such as sucrose and amino acids from the leaves and to all other cells of the plant, this is called translocation. Unlike xylem, phloem tissue consists of columns of living cells, containing a cytoplasm but no nucleus, and its activities are controlled by a companion cell next to it that has a nucleus, but the companion cells have no function in translocation . Share…

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Solved Differentiate Between The Function Of Xylem And

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