AP BIOLOGY

Detailed explanation-1: -Xylem is the complex tissue of plants, responsible for transporting water and other nutrients to the plants. 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).

Detailed explanation-2: -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).

Detailed explanation-3: -Because food is transported by active transport, which requires energy, the majority of phloem parts are alive and not dead like Xylem. The cell that becomes the sieve element goes through a highly regulated partial autolysis, resulting in a large, nearly empty cell that can transport a wide range of molecules.

Detailed explanation-4: -Xylem is a tissue consisting of dead, hollowed-out cells that form a system of pipes. The walls of xylem cells are lignified (strengthened with a substance called lignin ). This allows the xylem to withstand pressure changes as water moves through the plant.

Detailed explanation-5: -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.