Question

Phloem fibres are generally absent in

• A. Protophloem
• B. Metaphloem
• C. Primary phloem
• D. Secondary phloem

Answer 1

The correct option is A Protophloem

Phloem Fibre: These are also called bast fibres and are made up of sclerenchyma. Phloem fibres are usually absent in primary phloem but present in secondary phloem. The phloem fibres are much elongated, unbranched and have pointed, needle-like apices.Phloem fibres of jute, flax and hemp are commercially used. The primary phloem which is first formed consists of narrow sieve tubes and is called protophloem. The later formed phloem has bigger sieve tubes and is called metaphloem.

So the correct option is 'Primary phloem'.