tracheid वाक्य
उदाहरण वाक्य
मोबाइल
- However, in early plants, tracheids were too mechanically vulnerable, and retained a central position, with a layer of tough sclerenchyma on the outer rim of the stems.
- End walls excluded, the tracheids of prevascular plants were able to operate under the same hydraulic conductivity as those of the first vascular plant, " Cooksonia ".
- Because tracheids have a much higher surface to volume ratio compared to vessel elements, they serve to hold water against gravity ( by adhesion ) when transpiration is not occurring.
- A tracheid, once cavitated, cannot have its embolism removed and return to service ( except in a few advanced angiosperms that have developed a mechanism of doing so ).
- In particular, they did not have tracheids : elongated cells that help transport water and mineral salts, and that develop a thick lignified wall at maturity that provides mechanical strength.
- In coniferous or softwood species the wood cells are mostly of one kind, tracheids, and as a result the material is much more uniform in structure than that of most hardwoods.
- The different preservation of the Kazakhstan specimens allowed the presence of a central strand of tracheids to be demonstrated, showing that " C . sphaerica " is a vascular plant.
- Tracheids end with walls, which impose a great deal of resistance on flow; vessel members have perforated end walls, and are arranged in series to operate as if they were one continuous vessel.
- The stem presents nodes unilacunar ( with one trace ), with internal phloem absent, secondary thickening developing from a conventional cambial ring, xylem with tracheids; The sieve-tube plastids are S-type.
- The conducting elements of the xylem, the tracheids, were of the so-called'P-type'in which the walls were strengthened by ladder-like ( scalariform ) bars with circular openings between them.
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