| 单词 | rhizoid |
| 例句 | In the tundra, the mosses’ shallow rhizoids allow them to fasten to a substrate without penetrating the frozen soil. Fundamentals of Biology 2015-01-01T00:00:00Z Thin rhizoids attached the bryophytes to the substrate. Concepts of Biology 2013-04-25T00:00:00Z Mosses have a waxy coating and rhizoids that anchor them to the soil and absorb water and nutrients. Miller & Levine Biology 2018-01-01T00:00:00Z In the lab, this moss sent out new shoots from its rootlike "rhizoids," the researchers report. 1,500-Year-Old Antarctic Moss Brought Back to Life 2014-03-17T20:13:00Z It sends some long cells into the soil to serve as root-like objects called “rhizoids” and lives long enough to do its job. Ferns, Secret Ninja Ferns, and their Alluring Asexual Bits 2012-05-07T11:15:00.827Z Additionally, mosses are anchored to the substrate—whether it is soil, rock, or roof tiles—by multicellular rhizoids. Fundamentals of Biology 2015-01-01T00:00:00Z In the tundra, their shallow rhizoids allow them to fasten to a substrate without digging into the frozen soil. Concepts of Biology 2013-04-25T00:00:00Z True roots are never present, the plants being attached to the soil by rhizoids, which resemble the root-hairs of higher plants. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" Photo shows a rock marbled brown and black with multiple indentations and irregular, pockmarked features containing fossilized corms and rhizoids. Fundamentals of Biology 2015-01-01T00:00:00Z The spores sprout, producing a new thallus and rhizoids. Fundamentals of Biology 2015-01-01T00:00:00Z Mosses have simple conductive cells and are attached to the substrate by rhizoids. Fundamentals of Biology 2015-01-01T00:00:00Z The thallus bears two sorts of rhizoids, wider ones with smooth walls which grow directly down into the soil, and longer, narrower ones, with peg-like thickenings of the wall projecting into the cell-cavity. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" The wing-like lateral portions of the thallus gradually thin out from the midrib; from the projecting lower surface of this numerous rhizoids spring. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" The erect branches bear three rows of leaves, and spring from a creeping axis from which root-like branches destitute of rhizoids extend into the substratum. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" The rhizoids spring from the lower surface of the stem, and sometimes from the bases of the leaves. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" Thin rhizoids attached bryophytes to the substrate, but these rather flimsy filaments did not provide a strong anchor for the plant; neither did they absorb substantial amounts of water and nutrients. Fundamentals of Biology 2015-01-01T00:00:00Z The sac usually penetrates into the soil and bears rhizoids on its outer surface. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" In the Marchantiales the chief supply is obtained from the soil by the rhizoids, and its loss in transpiration is regulated and controlled. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" The small plants grow closely crowded in tufts, and consist of short leafy shoots attached to the soil by numerous fine rhizoids. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" The latter, in contrast to the rhizoids of liverworts, are composed of rows of elongated cells and are branched. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" Slowly, the benefits of the endophyte and rhizoid interactions for both partners led to present-day mycorrhizae; up to about 90 percent of today’s vascular plants have associations with fungi in their rhizosphere. Fundamentals of Biology 2015-01-01T00:00:00Z A filamentous protonema is first developed, some of the branches of which are exposed to the light and contain abundant chlorophyll, while others penetrate the substratum as brown or colourless rhizoids. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" In most liverworts, on the other hand, water is absorbed directly by the whole general surface, and the rhizoids are of subordinate importance. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" A, Germinating spores. s, Wall of spore; v, vacuole; w, rhizoid. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" The branched filamentous rhizoids which spring from the lower region of the stem also correspond to protonemal branches. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" In a bryophyte, all the conspicuous vegetative organs—including the photosynthetic leaf-like structures, the thallus, stem, and the rhizoid that anchors the plant to its substrate—belong to the haploid organism or gametophyte. Fundamentals of Biology 2015-01-01T00:00:00Z The social growth of the plants characteristic of many mosses is a result of the formation of numerous plants on the original protonema and on developments from the rhizoids. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" Fungal hyphae occur in the rhizoids and in the cells of the lower region of the thallus of many liverworts, as in the endotrophic mycorhiza of higher plants. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" The protonema forms a flat, lobed, thalloid structure attached to the soil by rhizoids, and the plants arise from marginal cells. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" |
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