sieve tube

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phloem and xylem Flashcards | Quizlet

The sieve tube member is elongated with a sieve plate on the top and bottom, creating a canal throughout the cell, ad the sieve tube element is filled with assimilate, which gets transported throughout the plant. The plasmodesmata attaches the companion cell to the sieve tube element.

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(PDF) Sieve Tube Geometry in Relation to Phloem Flow

The sieve plate wall in uninjured Phaseolus sieve tubes appears as a thin plate of even thickness (A). The pores may contain some material at the margins, which might be callose.

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#41 Transport In phloem | Biology Notes for A level

The phloem sap in a phloem sieve tube moves in one direction from the location where it is made to the location where it is used or stored. At any one time phloem sap can be moving in different directions in different sieve tubes.

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Phloem vs Xylem - Difference and Comparison | Diffen

Phloem has sieve tubes, companion cells, bast fibers as its elements. Phloem originates from meristematic cells in vascular cambium- primary phloem from apical meristem and secondary phloem from vascular cambium. Sap components. Xylem sap contains water, inorganic ions and a few organic chemicals. Phloem sap contains water and sugars.

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Sieve tube element - Wikipedia

Sieve tubes consist of sieve elements which are elongated cells, connected to each other via sieve plates to form a continous tube system that spreads out through the entire plant. Sieve plates are end walls containing large pores to provide a connection between adjacent sieve elements ( for more information on sieve plates see link on the left ).

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Why do sieve tube cells have sieves? - Quora

sieve tube, in flowering plants, elongated living cells (sieve-tube elements) of the phloem, the nuclei of which have fragmented and disappeared and the transverse end walls of which are pierced by sievelike groups of pores (sieve plates).

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what is the function of sieve tube in plants? | Yahoo Answers

 · The sieve tube is an elongated rank of individual cells, arranged end to end, and functioning to conduct food materials throughout the plant. The sieve areas of these cells are called sieve plates; the pores in sieve plates are generally larger and more variable in size.

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Function of sieve tube elements - Answers.com

In plant anatomy, sieve tube elements, are a specialized type ofelongated cell in the phloem tissue of flowering plants. The endsof these cells connect with other sieve tube m…embers, making up ...

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sieve-tube - David Darling

A sieve-tube is a characteristic element of phloem, which functions in the transport of food materials, such as sugars and proteins, synthesized within a plant.A sieve-tube consists of elongated, thin-walled, living cells arranged in a longitudinal row and forming a connected series by means of perforations in their walls through which pass strands of cytoplasm.

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Modeling the Hydrodynamics of Phloem Sieve Plates

 · The sieve tube structure has a pronounced effect on the flow due to the viscous drag imposed by the presence of the cell walls, the cell organs, the sieve plates, and other parietal materials (Crafts and Crisp, 1971; Thompson and Holbrook, 2003).Until recently, limited anatomical resolution has made detailed studies of the anatomy difficult.

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Sieve Tube | Article about Sieve Tube by The Free Dictionary

sieve tube[′siv ‚tüb] (botany) A phloem element consisting of a series of thin-walled cells arranged end to end, in which some sieve areas are more specialized than others. Sieve Tube a conducting element of flowering plants. A sieve tube is a monostichous strand stretched the length of the cells; the end walls of the cells bear sieve plates ...

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What is the difference between sieve cells and sieve tubes?

3. Sieve areas without sieve plates. 4. Long, elongated cells with tapering end walls. Sieve Tubes . 1. Found in angiosperms. 2. Associated with companion cells. 3. Sieve areas with sieve plates. 4. Shorter but wider cells placed one above the other and connected at the end walls by sieve pores.

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Sieve tube element - TheFreeDictionary.com

tube formed by cells joined end-to-end through which nutrients flow in flowering plants and brown algae

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Sieve-Tube Structure in Relation to Function

Typically, the sieve plates occur on the end walls, and the sieve-tube members are arranged end-on-end to form sieve tubes, the sieve-plate pores providing a high degree of protoplasmic continuity ...

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Sieve tube dictionary definition | sieve tube defined

A tube through which food is conducted in angiosperms, formed of a series of sieve-tube elements joined end to end.

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Where are sieve plates and sieve tubes present in a plant ...

Sieve tubes are not a part of any cell. These are a special type of cell in Phloem tissue of plants. Phloem: It is the complex vascular tissue through which photosynthates move from green tissue to the different parts of the plant.

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Sieve tube definition and meaning | Collins English Dictionary

a longitudinal tube in the phloem of flowering plants, consisting of a connected series of individual cells (sieve cells) and serving to conduct organic food materials through the plant Webster's New World College Dictionary, 4th Edition.

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sieve tube definition | English definition dictionary ...

sieve tube n (Botany) an element of phloem tissue consisting of a longitudinal row of thin-walled elongated cells with perforations in their connecting walls through which food materials pass

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Sugar Transport in Plants: Phloem | Biology 1520

Phloem sieve-tube elements have reduced cytoplasmic contents, and are connected by a sieve plate with pores that allow for pressure-driven bulk flow, or translocation, of phloem sap. Phloem is comprised of cells called sieve-tube elements.

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Is a sieve tube cell living, and why? - Quora

The ends of these cells are connected with other sieve tube members, and together they constitute the sieve tube. The main function of the sieve tube is transport of carbohydrates, primarily sucrose, in the plant (e.g., from the leaves to the fruits and roots).

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Function of sieve tube elements - Answers.com

In plant anatomy, sieve tube elements, are a specialized type ofelongated cell in the phloem tissue of flowering plants. The endsof these cells connect with other sieve tube m…embers, making up ...

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How to use sieve tube in a sentence - wordhippo.com

Vessel elements, tracheids, fibres, sieve tube elements, sieve cells, and parenchyma cells are the major components of vascular tissue. In the non-lignified portion, even the highly sensitive aniline blue staining failed to detect the presence of callose, which would be indicative of sieve tube formation.

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Sieve tube ls - University of Texas at Austin

The two arrows indicate the sieve plates at the ends of a sieve tube member; the two adjacent members of this same tube are located above the upper sieve plate and below the lower one. Notice especially that the lower sieve plate is tilted and that the sieve tube members are a little bulbous there, a bit bent .

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* Sieve tubes (Biology) - Definition,meaning - Online ...

Sieve tubes transport the products of photosynthesis from the leaves to all parts of the plant where energy is needed or stored. The mechanism of transport requires that the sieve tube elements have a living cell membrane, but not other large components of the protoplast that might block the pores on the sieve …

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Difference between Sieve Cells and Sieve Tubes ...

Sieve Tubes vs Sieve Cells (Similarities and Differences between Sieve Tubes and Sieve Cells) Phloem is a permanent vascular tissue system associated with the conduction of food materials in plants.

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Phloem - Wikipedia

Sieve tube cells do contain vacuoles and other organelles, such as ribosomes, before they mature, but these generally migrate to the cell wall and dissolve at maturity; this ensures there is little to impede the movement of fluids.

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What Is the Function of Companion Cells? | Reference.com

What Is the Function of Companion Cells? Companion cells are parenchymal cells found within the phloem of flowering plants that manage the flow of nutrients through sieve tubes. Companion cells deliver ATP, proteins and other nutrients to sieve elements.

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Difference Between Sieve Tubes and Companion Cells

 · Sieve tube cells are always associated with companion cells for efficient transportation of foods. Sieve cells occur end on end fashion and make a long tube to facilitate the conduction.

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* Sieve tubes (Biology) - Definition,meaning - Online ...

Sieve tubes transport the products of photosynthesis from the leaves to all parts of the plant where energy is needed or stored. The mechanism of transport requires that the sieve tube elements have a living cell membrane, but not other large components of the protoplast that might block the pores on the sieve …

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Sieve Tube Geometry in Relation to Phloem Flow - Plant Cell

of the conductivity of sieve tubes, called sieve tube–specific conductivity or k (mm2): k ¼ " 8N pr4 pl 8N pr4 p l2 p þ 8l p þ3pr p r4 # r2 8 where N p is the number of sieve pores per sieve plate, r (mm) is sieve element radius, l (mm) is sieve element length, r p (mm) is sieve pore radius, and l p is sieve plate thickness. The accuracy

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Sieve element - Biology-Online Dictionary | Biology-Online ...

In angiosperms, the sieve element is referred to as sieve tube (element) and the cell associated with it is called a companion cell. In gymnosperms and other primitive vascular plants, the sieve element is called a sieve cell and the associated cell is an albuminous cell.

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Phloem - Wikipedia

Sieve tube cells do contain vacuoles and other organelles, such as ribosomes, before they mature, but these generally migrate to the cell wall and dissolve at maturity; this ensures there is little to impede the movement of fluids.

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Sieve-tube member | Article about sieve-tube member by The ...

The food-conducting cells of phloem tissue in angiosperms; the individual cells have a sieve plate at each end and are arranged end to end to form a sieve tube.

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