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what is the functions of sieve tubes and how are they designed to carry out their functions?

Sieve elements are the type of cell that are responsible for transporting sugars throughout the plant.[2] At maturity they lack a nucleus and have very few organelles, so they rely on companion cells or albuminous cells for most of their metabolic needs. 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. One of the few organelles they do contain at maturity is the smooth endoplasmic reticulum, which can be found at the plasma membrane, often nearby the plasmodesmata that connect them to their companion or albuminous cells. All sieve cells have groups of pores at their ends that grow from modified and enlarged plasmodesmata, called sieve areas. The pores are reinforced by platelets of a polysaccharide called callose.

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the function is to conduct food materials throughout the plants. the sieve areas of these cells are called sieve plates, the pores in it are generally larger n variable in size. sieve tubes are mainly to transport sugars n nutrients up n down in sieve plants.

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sieve tubes are long tubular anucleated components of the phloem. they mainly help in conduction of food materials through the sieve pores in the sieve plate. together with the companion cells they form the functional unit of the phloem.
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the function is to conduct food materials throughout the plants. the sieve areas of these cells are called sieve plates, the pores in it are generally larger n variable in size. sieve tubes are mainly to transport sugars n nutrients up n down in sieve plants.
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va fa napoli
 
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