DENDROLOGY

Detailed explanation-1: -Phloem fibres also called as bast fibres are the only dead cells present in the phloem.

Detailed explanation-2: -The dead cells found in phloem are phloem fibres. Pholem is made up of five cells namely sieve cells, sieve tubes, companion cells, phloem fibres and phloem parenchyma. Phloem transports food from leaves to the other parts of the plants. Except for phloem fibres, other phloem cells are living cells.

Detailed explanation-3: -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). Sclerenchyma cells might sometimes be absent in primary and/or secondary phloem.