AP BIOLOGY

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

Detailed explanation-2: -Final answer: The dead element present in phloem is phloem fibers.

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).

Detailed explanation-4: -Sclerenchyma: Sclerenchyma cells consist of dead cells they are permanent tissues present in plants. They provide hardness and protection for plants.

Detailed explanation-5: -Phloem consists of four elements: Sieve tubes, companion cells, phloem parenchyma and phloem fibres. Except for phloem fibres, all other elements are living.