What do sieve tube members do?

The main functions of sieve tube members include maintaining cells and transporting necessary molecules with the help of companion cells. The sieve tube members are living cells (which do not contain a nucleus) that are responsible for transporting carbohydrates throughout the plant.

What are sieve tube explain?

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.

What is another name of sieve tube?

Sieve tube element In plant anatomy, sieve tube elements, also called sieve tube members, are a specialised type of elongated cell in the phloem tissue of flowering plants.

What is sieve tube Class 9?

Sieve tubes are elements of phloem. They are slender, tube-like structures composed of elongated thin-walled cells, placed end to end. The main function of sieve tubes is to transport sugars and nutrients up and down the plant.

What is sieve tubes in phloem?

The sieve tube is the conducting element of the phloem. It is formed from a vertical series of elongated cells, interconnected by perforations in their walls in areas known as sieve plates. The perforations may be restricted to smaller areas, sieve fields, several of which are contained in each sieve plate.

What does the sieve tube contain?

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. Mature sieve elements contain structural phloem specific proteins (P-proteins), mitochondria, ER, and sieve elements plastids.

Why are the sieve tube cells called so?

Sieve cells are also associated with gymnosperms because they lack thecompanion cell and sieve member complexes that angiosperms have. Their narrow pores are necessary in their function in most seedless vascular plants and gymnosperms which lack sieve-tube members and only have sieve cells to transport molecules.

What is the sieve tube made of?

Sieve tubes are composed of a file of cells called sieve elements (diameter about 24μm) that are symplastically connected by sieve pores.

What are sieve tubes and companion cells Class 9?

Answer: Sieve tubes and companion cells are components of Phloem. Phloem is a complex permanent plant tissue.

Why are the sieve tube cells called so Class 10?

Why are sieve tubes called so?

Which is a member of the sieve tube?

sieve tube member. [′siv ‚tüb ‚mem·bər] (botany) 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.

How are cells arranged in a sieve tube?

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. Want to thank TFD for its existence?

How are sieve tubes arranged in the Angiosperm?

sieve tube member. 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.

What makes up the sieve tube in the phloem?

Primary phloem tissue is made up of sieve tube members, companion cells, fibers, and parenchyma. Its bast consists of sieve tube elements, some fibres and parenchyma (Fig 1D).