AP BIOLOGY

Detailed explanation-1: -Phloem is living tissue, responsible for transporting food and other organic materials. Xylem consists of dead cells (parenchyma is the only living cells present in the xylem). Pholem mainly contains living cells (fibres are the only dead cells in the phloem).

Detailed explanation-2: -Phloem parenchyma and companion cells are elements of phloem and both are living cells. Phloem fibres also called as bast fibres are the only dead cells present in the phloem.

Detailed explanation-3: -Phloem is formed of living tubular cells, which provides a passage for the movement of food, formed in leaves to various parts of plants.

Detailed explanation-4: -Final answer: Phloem fibre is dead tissue.

Detailed explanation-5: -Phellem is made up of dead cells. It is suberised cork cells in which cork cambium or phellogen cut towards the outside. Xylem parenchyma, collenchyma, and phloem are all made up of living cells.