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phloem |
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phloem (flō`ĕm): see bark bark, outer covering of the stem of woody plants, composed of waterproof cork cells protecting a layer of food-conducting tissue—the phloem or inner bark (also called bast). ..... Click the link for more information. ; stem stem, supporting structure of a plant, serving also to conduct and to store food materials. The stems of herbaceous and of woody plants differ: those of herbaceous plants are usually green and pliant and are covered by a thin epidermis instead of by the bark of woody ..... Click the link for more information. . phloemor bastPlant tissues that conduct foods made in the leaves to all other parts of the plant. Phloem is composed of several types of specialized cells, including sieve-tube cells and phloem fibers. Sieve tubes (columns of sieve-tube cells), which have perforated areas in their walls, provide the main channels in which food substances travel. Phloem fibers are long, flexible cells that make up the soft fibers used commercially (e.g., flax and hemp). |
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Check the area between the vascular bundles of the xylem and phloem, looking for cotton pith. 13) phloem should have been defined as: Tissue that carries photosynthetic materials, such as sucrose, from the tree's leaves to other parts of the tree, including its roots. We may speak of royal sap in the phloem of champions, but the real world of trees is relatively egalitarian until chance chooses where a seed will land. |
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phloem
