NEET BIOLOGY

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: -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.

Detailed explanation-3: -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-4: -Found in the phloem cells of a plant are companion cells. Companion cells are a type of parenchyma cell.

Detailed explanation-5: -Sieve elements are elongated and function as the basic photosynthate-conducting cell type in the phloem of vascular plants.