HORTICULTURE

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

Detailed explanation-2: -Final answer: Phloem fibre is dead tissue.

Detailed explanation-3: -Complete answer: The components of the phloem are companion cells, sieve tubes, parenchyma, and fibers. Out of which phloem fibers are the dead cells. The phloem fibers are the dead cells with spindle-shaped, having a long narrow lumen, and thick walls. They are also called blast fibers.

Detailed explanation-4: -The phloem fibre is also called bast fibres and is made up of sclerenchyma are narrow and elongated cells. It is present in both in the primary phloem and the secondary phloem (but not present in the metaphloem).

Detailed explanation-5: -Phloem, or bast, fibres are flexible long sclerenchyma cells that make up the soft fibres (e.g., flax and hemp) of commerce. These provide flexible tensile strength to the phloem tissues. Sclerids, also formed for sclerenchyma, are hard irregularly shaped cells that add compression strength to the tissues.