| 单词 | vascular bundle |
| 例句 | There are four teardrop-shaped vascular bundles, with the narrow point of the teardrop meeting at a round xylem vessel. Fundamentals of Biology 2015-01-01T00:00:00Z In stems, the xylem and the phloem form a structure called a vascular bundle; in roots, this is termed the vascular stele or vascular cylinder. Biology for AP Courses 2022-06-09T00:00:00Z In monocots, clusters of xylem and phloem tissue, called vascular bundles, are scattered through stem ground tissue. Miller & Levine Biology 2018-01-01T00:00:00Z The stem is star-shaped rather than circular; the vascular bundles are scattered in the lobes of the star-shaped body and absent in the arcs. How Woody Vines Do the Twist 2020-08-01T04:00:00Z Photographed by David Maitland at 200 times life size, the image is a slice through the ‘vascular bundles’ that plants use to transport fluids through their tissues. 365 days: The best science images of 2015 2015-12-16T05:00:00Z The four vascular bundles are encased in ground tissue. Fundamentals of Biology 2015-01-01T00:00:00Z What happens to the vascular bundles in the stem of a dicot as the plant matures? Biology for AP Courses 2022-06-09T00:00:00Z In gymnosperms and dicots, vascular bundles are arranged in a ring. Miller & Levine Biology 2018-01-01T00:00:00Z The cutting off of the vascular bundles and disturbance of the water supply only partly explain the premature fall. Disease in Plants 2012-03-01T03:00:22Z The fruits of Luffa aegyptiaca have a number of closely netted vascular bundles in the pericarp, forming a kind of loose felt which supplies the well-known loofah or bath-sponge. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" 2012-01-31T03:00:17.257Z Symmetrically arranged near the outside of the stem are egg-shaped vascular bundles; the narrow end of the egg points inward. Fundamentals of Biology 2015-01-01T00:00:00Z When the stem is viewed in cross section, the vascular bundles of dicot stems are arranged in a ring. Biology for AP Courses 2022-06-09T00:00:00Z The point which has interested me most is tracing the nerves! which follow the vascular bundles. Charles Darwin: His Life in an Autobiographical Chapter, and in a Selected Series of His Published Letters 2012-01-22T03:00:19.733Z In earlier stages, only the vascular bundles are brown and blocked with gum-like substances. Disease in Plants 2012-03-01T03:00:22Z The primary vascular bundles in a young conifer stem are collateral, and, like those of a Dicotyledon, they are arranged in a circle round a central pith and enclosed by a common endodermis. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 "Gyantse" to "Hallel" 2011-12-26T03:00:11.613Z The inner part of the vascular bundle is xylem tissue, and the outer part is sclerenchyma tissue. Fundamentals of Biology 2015-01-01T00:00:00Z A single vascular bundle, no matter how large or small, always contains both xylem and phloem tissues. Biology for AP Courses 2022-06-09T00:00:00Z In internal structure grass-culms, save in being hollow, conform to that usual in monocotyledons; the vascular bundles run parallel in the internodes, but a horizontal interlacement occurs at the nodes. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" 2011-11-13T03:00:13.177Z Dicotyledons are further characterized by their netted-veined leaves and their 'open' vascular bundles containing a cambium; the parts of the flower are commonly in fours or fives. The New Gresham Encyclopedia Volume 4, Part 1: Deposition to Eberswalde 2011-04-14T02:00:57.977Z The characters of leaves most useful for diagnostic purposes are the position of the stomata, the presence and arrangement of resin-canals, the structure of the mesophyll and vascular bundles. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 "Gyantse" to "Hallel" 2011-12-26T03:00:11.613Z In the monocot stem, the vascular bundles are scattered throughout the ground tissue. Fundamentals of Biology 2015-01-01T00:00:00Z In monocots, the vascular bundles form a distinct ring. Biology for AP Courses 2022-06-09T00:00:00Z The vascular bundles sometimes form a prominent rib, which indicates the middle of the sepal; at other times they form several ribs. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 "Fleury, Claude" to "Foraker" 2011-04-03T02:00:20.883Z The cross and longitudinal sections of a vascular bundle of the stem of Pennisetum cenchroides, are shown in figs. A Handbook of Some South Indian Grasses The stalk of an ovule, considerably reduced in normal flowers and much larger in some abnormal flowers, is homologous with a leaf-stalk, with which it agrees in the structure and number of vascular bundles. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 "Gyantse" to "Hallel" 2011-12-26T03:00:11.613Z Xylem is located toward the inside of the vascular bundle, and phloem is in the middle. Fundamentals of Biology 2015-01-01T00:00:00Z In dicots, the vascular bundles are scattered in the ground tissue. Biology for AP Courses 2022-06-09T00:00:00Z This is probably due to a lateral chorisis or subdivision of the primitive tubercle or growing point, followed by a like subdivision of the vascular bundle supplying it. Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants In all these vascular bundles the bundle-sheath is very strongly developed all round and is very much developed especially at the sides. A Handbook of Some South Indian Grasses In Sciadopitys similar spurs occur, each bearing a single needle, which in its grooved surface and in the possession of a double vascular bundle bears traces of an origin from two needle-leaves. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 "Gyantse" to "Hallel" 2011-12-26T03:00:11.613Z From these suckers, cells invade the host stem and grow to connect with the vascular bundles of the host. Fundamentals of Biology 2015-01-01T00:00:00Z In monocots, the vascular bundles are scattered in the ground tissue. Biology for AP Courses 2022-06-09T00:00:00Z In these flowers the calyx is normal, the tube of the corolla is traversed by ten vascular bundles, and the limb is divided into ten fimbriated lobes. Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants Within the ground tissue are found a number of vascular bundles scattered more or less uniformly. A Handbook of Some South Indian Grasses It is of interest to note that the leaves of Gnetum, while typically Dicotyledonous in appearance, possess a Gymnospermous character in the continuous and plate-like medullary rays of their vascular bundles. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 "Gyantse" to "Hallel" 2011-12-26T03:00:11.613Z The vascular bundles of affected plants were browned as in Verticillium or Fusarium wilt and in some bacterial diseases. Northern Nut Growers Association Thirty-Fourth Annual Report 1943 A time course is developed to follow the fate of the vascular bundles in the stem of dicots. Biology for AP Courses 2022-06-09T00:00:00Z It was not practicable to examine the arrangement of the vascular bundles in the rachis. Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants The vascular bundles are rather numerous and irregularly scattered all over the ground tissue. A Handbook of Some South Indian Grasses The vascular bundles of the stem belong to the collateral type, that is to say, the elements of the wood or xylem and the bast or phloem stand side by side on the same radius. Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1 Portions of diseased plants with discolored vascular bundles were placed in a damp chamber and no fungus or bacterial growth developed from the vascular system. Northern Nut Growers Association Thirty-Fourth Annual Report 1943 The vascular bundles join to form growth rings. Biology for AP Courses 2022-06-09T00:00:00Z The form of the leaf-stalk and the arrangement of the vascular bundles in a circle in the case of the hazel, before alluded to, bear out this notion. Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants Another stem in which the vascular bundles are more or less peripheral in position and enclosing a wide parenchyma is that of Setaria glauca. A Handbook of Some South Indian Grasses Finally, at b, we recognize the undoubted traces of a vascular bundle running to the leaves. Scientific American Supplement, No. 481, March 21, 1885 Microscopic studies and attempts to culture a fungus from the vascular bundles of affected plants showed the absence of any fungus that might have caused, the disease. Northern Nut Growers Association Thirty-Fourth Annual Report 1943 The vascular bundles divide into primary xylem and primary phloem. Biology for AP Courses 2022-06-09T00:00:00Z The arrangement of the vascular bundles shows that the upper row is external in relation to the lower series. Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants As to the vascular bundles there are three sets. A Handbook of Some South Indian Grasses Spiral vessels, accompanied by simple vascular tissue, branch off from the vascular bundles in the blade of the leaf, and run up all the tentacles into the glands. Insectivorous Plants The browning in the vascular bundles appeared to be confined to the phloem tissue. Northern Nut Growers Association Thirty-Fourth Annual Report 1943 The vascular bundles divide into secondary xylem and primary phloem. Biology for AP Courses 2022-06-09T00:00:00Z First, the transmission is through the ordinary cellular tissue, and not through what are called the fibrous or vascular bundles. Darwiniana; Essays and Reviews Pertaining to Darwinism It consists of one or two layers of cells connecting a few vascular bundles forming the outermost set. A Handbook of Some South Indian Grasses The point which has interested me most is tracing the NERVES! which follow the vascular bundles. Life and Letters of Charles Darwin — Volume 2 This is the so-called anatomical method, which seeks to draw conclusions as to the morphology of the flower from the course of the vascular bundles in the several parts. Darwin and Modern Science Such bundles as these are called closed vascular bundles to distinguish them from the dicotyledonous type of vascular bundles which are called open vascular bundles on account of the existence of the cambium. A Handbook of Some South Indian Grasses The component parts and elements of which the vascular bundles in grasses are composed may be learnt by studying the transverse and longitudinal sections of these bundles in any grass. A Handbook of Some South Indian Grasses There is a series of vascular bundles inside the ring which surrounds a large area of the ground tissue. A Handbook of Some South Indian Grasses The peripheral portion of the stem becomes somewhat rigid and thick due to the aggregation of vascular bundles, some small and others large. A Handbook of Some South Indian Grasses In the vascular bundles of the ground tissue the bundle-sheath is rather prominent and the phloëm portion is well developed. A Handbook of Some South Indian Grasses The second series is made up of large vascular bundles imbedded in the ring so as to bulge out inside the ring. A Handbook of Some South Indian Grasses The vascular bundles of the third series are found just away from the ring and separated from it by a few layers of parenchymatous cells. A Handbook of Some South Indian Grasses The other vascular bundles may have bands of sclerenchyma on both sides or on one side only or none. A Handbook of Some South Indian Grasses Still inside, at some distance from the sclerenchymatous band, are seen vascular bundles forming a row and enclosing a large space of the ground tissue consisting of only parenchyma. A Handbook of Some South Indian Grasses Another row of vascular bundles lies just inside the sclerenchymatous ring and each of these bundles is in contact with the band. A Handbook of Some South Indian Grasses Two rows of vascular bundles surround a fairly large amount of parenchymatous cells of the ground tissue. A Handbook of Some South Indian Grasses Within the sclerenchymatous band lie small vascular bundles at regular intervals just towards the cortex. A Handbook of Some South Indian Grasses The upper bands of the primary and the lower bands of the secondary vascular bundles just touch the chlorophyllous layer. A Handbook of Some South Indian Grasses Just close to the cavity and separated from it by only one or two parenchymatous cells are found vascular bundles forming a series. A Handbook of Some South Indian Grasses In each of these bands lies a vascular bundle on the upper side near the periphery. A Handbook of Some South Indian Grasses The spaces existing between the vascular bundles and the epidermis are filled with parenchymatous cells. A Handbook of Some South Indian Grasses The larger vascular bundles consist of xylem and phloëm surrounded by a bundle sheath of a single layer of cells. A Handbook of Some South Indian Grasses In the case of most grasses the motor-cells are found in groups of three, four or five between the vascular bundles. A Handbook of Some South Indian Grasses Around every vascular bundle there is a single row of somewhat large cells densely packed with large chloroplasts, the chlorophyllous layer. A Handbook of Some South Indian Grasses The vascular bundles are strengthened by fibres, on both the sides in the case of larger bundles and on only one side in small bundles. A Handbook of Some South Indian Grasses In a transverse section of this leaf, the vascular bundles are very conspicuous. A Handbook of Some South Indian Grasses In a well developed large vascular bundle the chlorophyllous layer is open below just close to the sclerenchymatous band. A Handbook of Some South Indian Grasses X Xylemthe wood elements of the vascular bundle lying next to the phloëm, 19. A Handbook of Some South Indian Grasses On both sides of the larger vascular bundle there are bands of sclerenchyma. A Handbook of Some South Indian Grasses Every large primary vascular bundle in the leaves of many grasses possesses sclerenchymatous bands both above and below. A Handbook of Some South Indian Grasses The lower band of the primary vascular bundles is continuous with the vascular bundle, the chlorophyllous layer being open below. A Handbook of Some South Indian Grasses The stomata occur in regular rows between the vascular bundles and they are quite characteristic of grasses. A Handbook of Some South Indian Grasses A vascular bundle consists of only xylem and phloëm, without the cambium, and so no secondary thickening can take place in the stems of grasses. A Handbook of Some South Indian Grasses |
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