A sieve element is the main conductive component of the phloem. The sieve tube elements are specialized elongated cells in the phloem that connect end to end forming a tube. Sieve elements are elongated and function as the basic photosynthate-conducting cell type in the phloem of vascular plants. a. transport carbon dioxide into leaves b. transport water downward c. transport sugars throughout the plant d. transport water upward. Ø In sieve tubes, the sieve area is located on the end wall called sieve plate. Companion cells apparently function with the enucleate sieve-tube elements and die when they break down. A: Sieve plate with sieve pores connects sieve tube elements F: Sieve pores connect sieve tube element and this lets materials through (particularly sucrose and amino acids)- assimilates (organic molecules that the plant has made itself) Unlike the similar albuminous cells of gymnosperms, companion cells are derived from the same parent cell as the conductive sieve tube ⦠Thus, each sieve tube cell in this tube is called a sieve-tube member. The function of phloem tissue in a plant is to: . Sieve-Tube Structure in Relation to Function Ray F. Evert Virtually all the mechanisms that have been proposed for the long-distance trans-port of food substances in angiosperms, or flowering plants, require a specific type of conduit. Sieve tube elements Companion cells How is phloemâs structure related to its function? Each cell is referred to as sieve-tube element (or sieve-tube ⦠It is made up of number of living cells. Does it provide structural support? The wall is thin. Therefore, it is a series of cells forming a tube through which the photosynthate materials flow through. ing sieve elements and phloem parenchyma cells is evaluated in terms of their function as valves, connecting the sieve tube pressure manifold system to the various plant tissues. The cells that make up the phloem are adapted to their function: Sieve tubes â specialised for transport and have no nuclei. Difference # Sieve Tube: 1. The basis of comparison includes: function, presence, metabolic activity and transverse wall among others. Sieve elements are the type of cell that are responsible for transporting sugars throughout the plant. The main function of this tube is to transport nutrition in the form of carbohydrates. Sieve-tube element definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. Ø They are longitudinal series of cells connected one above the other. Secondary thickenings are absent. Abstract. What is phloem? In this article, get to understand the underlying difference and similarities between sieve tube elements and companion cells in details. Ø They are advanced type of sieve elements. The companion cells are there to help with active processes required by the sieve tube elements. The minimal organelle repertoire of sieve elements is not sufï¬cient for self-supported survival. In sieve tube â¦almost always adjacent to nucleus-containing companion cells, which have been produced as sister cells with the sieve element from the same mother cell. No, sieve tube elements are one of the parts in the transport system in plants. Companion cells, which are smaller, have nuclei at maturity and are living; they are found adjacent to the sieve-tube elements and are believed to control the process of conduction in the sieve tubes. The function of sieve-tube elements is to _____. 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