Information om | Engelska ordet XYLEM

Exempel på hur man kan använda XYLEM i en mening

• Most algae are aquatic organisms and lack many of the distinct cell and tissue types, such as stomata, xylem and phloem that are found in land plants.
• Wood is sometimes defined as only the secondary xylem in the stems of trees, or more broadly to include the same type of tissue elsewhere, such as in the roots of trees or shrubs.
• One of the traits is the absence of a vascular cambium, which is required to produce both xylem (wood) and phloem, which therefore are missing.
• The ferns (Polypodiopsida or Polypodiophyta) are a group of vascular plants (plants with xylem and phloem) that reproduce via spores and have neither seeds nor flowers.
• Root pressure occurs in the xylem of some vascular plants when the soil moisture level is high either at night or when transpiration is low during the daytime.
• Guttation is the exudation of drops of xylem and phloem sap on the tips or edges of leaves of some vascular plants, such as grasses, and also a number of fungi.
• Sap is the fluid transported in xylem cells (tracheids or vessel elements) or phloem sieve tube elements of a plant.
• It produces secondary xylem inwards, towards the pith, and secondary phloem outwards, towards the bark.
• The primary difference between gnetophytes and other gymnosperms is the presence of vessel elements, a system of small tubes (xylem) that transport water within the plant, similar to those found in flowering plants.
• Subfamily Pinoideae (Pinus): cones are biennial, rarely triennial, with each year's scale-growth distinct, forming an umbo on each scale, the cone scale base is broad, concealing the seeds fully from abaxial (below the phloem vessels) view, the seed is without resin vesicles, the seed wing holds the seed in a pair of claws, leaves have primary stomatal bands adaxial (above the xylem) or equally on both surfaces.
• Later, more complex pits appeared, such as bordered pits on many tracheids, which allowed plants to transport water between cells while reducing the risk of cavitation and embolisms in the xylem.
• Like most organic beings, many bioships contain large amounts of "scaffolding" materials to keep their shape, such as the xylem in trees or bone and chitin in animals.
• The trunk consists of five main parts: The outer bark, inner bark (phloem), cambium, sapwood (live xylem), and heartwood (dead xylem).
• Sap is a fluid transported in xylem cells (vessel elements or tracheids) or phloem sieve tube elements of a plant.
• Though the bifacial cambium of modern trees produces both secondary phloem and xylem, the unifacial cambium of Lepidodendron lycopsid produced only secondary xylem.
• Once the solutes are passively filtered, they eventually reach the pericycle, where they can be moved into the xylem for long-distance transport.
• The citrus longhorn beetle bores deeper into the tree and feeds on the xylem in later larval stages.
• The vascular cambium of Calamites was unifacial, producing secondary xylem towards the stem center, but not secondary phloem.
• Very rapid internode elongation results in the formation of a pith cavity and a ring of carinal canals formed by disruption of the primary xylem.
• Girdling, also called ring-barking, is the circumferential removal or injury of the bark (consisting of cork cambium or "phellogen", phloem, cambium and sometimes also the xylem) of a branch or trunk of a woody plant.

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