NEET BIOLOGY

Detailed explanation-1: -The sieve cells of non-angiospermous vascular plants lack true companion cells, … … specialized parenchyma cell called a companion cell.

Detailed explanation-2: -PHLOEM. 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-3: -Companion cells are closely associated with sieve elements. Companion cells are associated with sieve elements through plasmodesmata and they together help in the transport mechanism in plants.

Detailed explanation-4: -So, the correct answer is ‘Companion cells.

Detailed explanation-5: -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.