The cells having sieve like perforations in their cell walls present in phloem are the sieve tubes of the phloem.
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Sieve phloem is a specialized tissue in plants that is responsible for transporting organic nutrients such as sugars from the leaves to other parts of the plant. It is made up of sieve tube elements and companion cells, which work together to facilitate the flow of nutrients through the plant.
The sieve tubes are located in the phloem tissue of plants. They are responsible for transporting sugars and other nutrients throughout the plant.
The tissue that contains sieve tubes is called phloem. Phloem is a vascular tissue in plants that is responsible for transporting sugars, nutrients, and other organic compounds throughout the plant.
Phloem is composed of sieve tubes, companion cells, fibers, and parenchyma cells. Sieve tubes are long cells that transport organic compounds, companion cells support the sieve tubes, fibers provide structural support, and parenchyma cells store nutrients. Together, these components make up the vascular tissue responsible for transporting sugars and other organic nutrients throughout the plant.
The nucleated cells in the phloem that aid in the physiology of sieve tubes are called companion cells. These cells are closely associated with sieve tube cells and provide metabolic support, such as loading and unloading of nutrients, for the sieve tubes.
Dead xylem cells are called "tracheids" or "vessel elements," while dead phloem cells are called "sieve cells" or "sieve tube members."