EVERYDAY SCIENCE

Detailed explanation-1: -Phloem is a complex tissue which is concerned with the transport of food materials from leaves to other plant parts. Phloem is composed of sieve tube elements, companion cells, phloem parenchyma and phloem fibres. sieve tubes are longitudinally arranged cells. It is seen associated with the companion cells.

Detailed explanation-2: -Phloem: It is a complex tissue in the vascular system of higher plants that consists mainly of sieve tubes and elongated parenchyma cells usually with fibers and that functions in translocation and in support and storage. Sieve tubes and companion cells are the elements of phloem.

Detailed explanation-3: -The phloem element consists of the sieve tube, companion cells, parenchyma, and fiber.

Detailed explanation-4: -The structural elements of phloem include sieve tubes, companion cells, phloem parenchyma and secretory cells. 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.

Detailed explanation-5: -Companion cells are large elongated cells of phloem with large nucleus. It is attached to the lateral side of sieve tubes. These cells help in transport of food along with sieve. These are specifically found only in angiosperms.