Xylem

Science / Biology / Xylem: Tissue in the vascular system of plants that moves water and dissolved nutrients from the roots to the leaves; composed of various cell types including tracheids and vessel elements. Plant tissue type that conducts water and nutrients from the roots to the leaves.

Secondary Xylem

Science / Biology / Secondary Xylem: Xylem produced by the vascular cambium in a woody plant stem or root; wood. MORE

Vessel Elements

Science / Biology / Vessel Elements: Short, wide cells arranged end to end, forming a system of tubes in the xylem that moves water and solutes from the roots to the rest of the plant. Large diameter cells of the xylem that are extremely MORE

Heartwood

Science / Biology / Heartwood: Inner rings of xylem that have become clogged with metabolic by-products and no longer transport water; visible as the inner darker areas in the cross section of a tree trunk. MORE

Tracheids

Science / Biology / Tracheids: Long, tapered cells with pitted walls that form a system of tubes in the xylem and carry water and solutes from the roots to the rest of the plant. One type of xylem cells. Tracheids are long and rela MORE

Wood

Science / Biology / Wood: The inner layer of the stems of woody plants; composed of xylem. MORE

Sapwood

Science / Biology / Sapwood: Layers of secondary xylem that are still functional in older woody plants; visible as the outer lighter areas in the cross section of a tree trunk. MORE

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