Question

Why is phloem parenchyma absent in primary phloem but present in secondary phloem

Answer 1

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