what is sieve tube,companion cells,phloem
parenchyma,phloem fibres
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Answer:
Phloem, also called bast, tissues in plants that conduct foods made in the leaves to all other parts of the plant. Phloem is composed of various specialized cells called sieve tubes, companion cells, phloem fibres, and phloem parenchyma cells.
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). They are the conduits of food (mostly sugar) transport.
The function of phloem parenchyma is to store food material and other substances like resins, latex and mucilage. It also helps in translocation of food. They also helps in slow lateral conduction of food.
: a living nucleated cell that is closely associated in origin, position, and probably function with a cell making up part of a sieve tube of a vascular plant.
Companion cells are living cells that are connected to the sieve-tube members of the phloem through plasmodesmata.
A fibre is a thin thread of a natural or artificial substance, especially one that is used to make cloth or rope. .