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: -The phloem is a complex tissue and is formed typically by three cell types, the sieve elements, the parenchyma cells, and the sclerenchyma cells (Figure 2a–d).

Detailed explanation-3: -It is a living tissue, which is responsible for transporting food and other organic materials. Xylem generally consists of dead cells (parenchyma is the only living cell present in the xylem). Phloem: It is a tubular-shaped, elongated structure having walls with thin sieve tubes.

Detailed explanation-4: -Hint: In phloem both companion cell and sieve tubes are living cells.

Detailed explanation-5: -Transport of food through the sieve tube elements of phloem require active transport. This requires the expenditure of energy which can only be done by living cells.