Question

Phloem fibers are made up of which type of tissue?

• A. Parenchyma
• B. Collenchyma
• C. Sclerenchyma
• D. Aerenchyma

Answer 1

The correct option is C Sclerenchyma

Phloem fibers (bast fibers) 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 fibers is quite thick. At maturity, these fibers lose their protoplasm and become dead. Phloem fibers of jute, flax and hemp are used commercially.