velamen वाक्य
उदाहरण वाक्य
मोबाइल
- Epidermis, called velamen, has the function to absorb humidity.
- The velamen arises from the root tip by division of a special tissue.
- The roots are covered by velamen.
- In some orchids, the velamen includes spongy and fibrous bodies near the passage cells, called tilosomes.
- Upon absorbing water, the dead cells become transparent, and the whole velamen tissue then appears green.
- Orchids with velamen, a layer of cells covering the roots that helps prevent moisture loss, require a long, heavy drink.
- The dead cells of velamen diffuse light, thus giving it a grey appearance except at the tips, where the chlorophyll become visible.
- Once reaching and touching a surface the Velamen is not produced in the contact area, allowing the root to absorb water like terrestrial roots.
- The exodermis is surrounded by velamen, consisting of one to several layers of cells, which can develop root hair under proper environmental conditions.
- The roots of all " Prosthechea " species possess a velamen ( a thick sponge-like covering ) differentiated into epivelamen and endovelamen.
- The velamen of an orchid is the white or gray covering of aerial roots ( when dry, and usually more green when wet as a result of the appearance of underlying photosynthetic structures ).
- The velamen also serves a mechanical function, protecting the tissues in the root cortex, shielding the root from transpirational water loss, and, in many cases, adhering the plant to the substrate.
- Some surprising results in studies on aerial roots of Orchids show that the'Velamen'- the white spongy envelop of the aerial roots, are actually totally water proof, preventing water loss but not allowing any water in.
- There are two known species, with worldwide distribution in warm, and warm-temperate waters : " Cestum veneris " ( " Venus'girdle " ) is among the largest ctenophores up to long, and can undulate slowly or quite rapidly . " Velamen parallelum ", which is typically less than long, can move much faster in what has been described as a " darting motion ".
- The corporal was described as " palla corporalis ", or " velamen dominic mens ", or " opertorium dominici corporis ", etc .; and it seems generally to have been of linen, though we hear of altar-cloths of silk, or of purple; ( a coloured miniature in the tenth-century Benedictional of St . Thelwold also seems to show a purple altar-covering ), or of cloth-of-gold.
- They are characterized by round-section root with thick velamen, four-angled fleshy pseudobulbs of one internode, often basally protected by dried sheaths and with only one apical leaf ( except for " Bifrenaria steyermarkii ", which occasionally has two ), plicate ( fan-folded ) enervated leathery leaves, yet malleable and not exceedingly thick, with a pseudo-petiole of basal round section, and a basal inflorescences bearing up to ten flowers, which seldom surpass the leaves'length.
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