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Vascular Plants with Seeds C9L3P2 Plant Tissues
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tissue a group of similar cells working together to perform a particular function
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A typical plant has 3 distinct kinds of tissue Dermal tissue Ground tissue Vascular tissue
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Dermal Tissue Protection Prevent loss of water Examples: epidermis, periderm
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Ground Tissue Metabolism Storage Support Examples: parenchyma, collenchyma, schlerenchyma
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Vascular Tissue Transport water and sugar Examples: xylem, phloem
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Vascular Tissue The plant’s sap-conducting tissues Two types: xylem & phloem Xylem: transports water and dissolved minerals (one kind of sap) upward (long, thick-walled cells) Phloem: transports food manufactured in the leaves (the other kind of sap) downward
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Vascular Tissue In leaves and in non-woody plants, the xylem and phloem are usually arranged in vascular bundles (veins). Vascular bundles are often supported by thick- walled cells called fibers. Fibrovasular bundles: xylem and phloem surrounded by supporting tissues
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Two kinds of xylem cells are tracheids and vessel elements. All vascular plants have xylem that is composed of tracheids. Tracheid cells die at maturity, leaving a hollow tube that water can flow through freely. Xylem
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Xylem in flowering plants also includes cells called vessel elements. The end of vessel elements have larger openings than those found in tracheid cells. Water can pass through easily. Xylem
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Another type of vascular tissue— phloem—carries dissolved sugars throughout a plant. Phloem is composed of two types of cells— sieve-tube elements and companion cells. Phloem
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Sieve-tube elements are long, thin cells stacked end-to-end to form long tubes. A companion cell helps control the functions of the sieve- tube element. Phloem
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Vascular Tissue
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Xylem Phloem
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Vascular Tissue
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Vascular Tissue Sunflower Stem
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Vascular Tissue
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