Fibres associated with phloem are known as ...... fibres.

Companion cells are closely associated with . . . . . . .

Companion cells are part of angiospermic:

They provide mechanical support to the growing parts of the plant such as young stem and petiole of leaf.

$A$ fibre which contains simple pits is

Assertion: In angiosperms,the conduction of water is more efficient because their xylem has vessels.
Reason: Conduction of water by vessel elements is an active process with energy supplied by xylem parenchyma rich in mitochondria.