Question

Phloem fibers are

• A. generally absent in the primary phloem but are found in the secondary phloem
• B. generally absent in the secondary phloem but are found in the primary phloem
• C. responsible for the transport of water from roota to variousplant parts
• D. made up of parenchymatous cells

Answer 1

The correct option is A generally absent in the primary phloem but are found in the secondary phloem

Mature phloem fibres/bast fibres of jute, flax and hemp are made up of dead sclerenchymatous cells. These fibres are generally found in secondary phloem and are absent in primary phloem. The fibres provide mechanical support to sieve elements (sieve cells and sieve-tube). These fibres possess thick lignified walls and they differ from the xylem fibres in having simple pits.
Thus option a is the correct answer.