Question

Phloem fibres (bast fibres) are made up of
sclerenchymatous cells. These are generally absent in the primary phloem
but are found in the secondary phloem. These are much elongated,
unbranched and have pointed, needle like apices. The cell wall of phloem
fibres is quite thick. At maturity, these fibres lose their protoplasm and
become dead. Phloem fibres of jute, flax and hemp are used commercially

Accepted Answer

Jute     Corchorus olitoriusHemp   Cannabis sativaFlax   Linum usitatissimum

Phloem Fibres Flax Hemp Bast Made Sclerenchymatous Cells