Question

Fibres are likely to be absent in
a. Secondary phloem
b. Secondary Xylem
c. Primary phloem
d. Leaves


NCERT Class XI
Biology - Exemplar Problems

Chapter 6. Anatomy of Flowering Plants

Answer 1

Of the options given in the question, it is likely that the “Primary Phloem” might not have fibers.

The primary phloem is formed in apical meristems of the roots and shoots. The primary phloem may consist of protophloem or metaphloem.

The sieve tubes of protophloem are torn and are destroyed as the plant grows since it cannot stretch with elongating tissues. The other types of cells in the phloem get converted into fibers.