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  2. Tracheid - Wikipedia

    en.wikipedia.org/wiki/Tracheid

    Tracheids were the main conductive cells found in early vascular plants. In the first 140-150 million years of vascular plant evolution, tracheids were the only type of conductive cells found in fossils of plant xylem tissues. [5] Ancestral tracheids did not contribute significantly to structural support, as can be seen in extant ferns. [6]

  3. Xylem - Wikipedia

    en.wikipedia.org/wiki/Xylem

    In living plants, pitted tracheids do not appear in development until the maturation of the metaxylem (following the protoxylem). In most plants, pitted tracheids function as the primary transport cells. The other type of vascular element, found in angiosperms, is the vessel element. Vessel elements are joined end to end to form vessels in ...

  4. Vascular plant - Wikipedia

    en.wikipedia.org/wiki/Vascular_plant

    The xylem consists of vessels in flowering plants and of tracheids in other vascular plants. Xylem cells are dead, hard-walled hollow cells arranged to form files of tubes that function in water transport. A tracheid cell wall usually contains the polymer lignin. The phloem, on the other hand, consists of living cells called sieve-tube members ...

  5. Vessel element - Wikipedia

    en.wikipedia.org/wiki/Vessel_element

    Two kinds of cell are involved in xylem transport: tracheids and vessel elements. [2] [3] [4] Vessel elements are the building blocks of vessels, the conducting pathways that constitute the major part of the water transporting system in flowering plants. Vessels form an efficient system for transporting water (including necessary minerals) from ...

  6. Vascular tissue - Wikipedia

    en.wikipedia.org/wiki/Vascular_tissue

    Cross section of celery stalk, showing vascular bundles, which include both phloem and xylem Detail of the vasculature of a bramble leaf Translocation in vascular plants. Vascular tissue is a complex conducting tissue, formed of more than one cell type, found in vascular plants. The primary components of vascular tissue are the xylem and phloem ...

  7. Wood anatomy - Wikipedia

    en.wikipedia.org/wiki/Wood_anatomy

    Wood anatomy is a scientific sub-area of wood science, [1] which examines the variations in xylem anatomical characteristics across trees, shrubs, and herbaceous species to explore inquiries related to plant function, growth, and the environment.

  8. Today’s NYT ‘Strands’ Hints, Spangram and Answers for Sunday ...

    www.aol.com/today-nyt-strands-hints-spangram...

    According to the New York Times, here's exactly how to play Strands: Find theme words to fill the board. Theme words stay highlighted in blue when found.

  9. Conifer - Wikipedia

    en.wikipedia.org/wiki/Conifer

    Tracheids make up more than 90% of timber volume. The tracheids of earlywood formed at the beginning of a growing season have large radial sizes and smaller, thinner cell walls . Then, the first tracheids of the transition zone are formed, where the radial size of cells and the thickness of their cell walls changes considerably.