what does protophloem differ to metaphloem - Biology - Anatomy of Flowering Plants

Question

what does protophloem differ to metaphloem?

Manik Mishra · Accepted Answer

Protophloem
Metaphloem

It is the first formed phloem when the plant organ is
growing
It is the later formed phloem which differentiates when the
plant organ has completed its growth

It is less prominent
It is more prominent

It is made up of smaller and narrower elements
It is made up of longer and broader elements

Sieve areas or pores are not prominent
Sieve areas or pores are quite prominent

Companion cells are often absent
Companion cells are usually present

Protophloem is short lived and gets crushed
It is long lived and can be crushed during secondary
growth

In the region of crushed protophloem, fibers often develop from
specialized cells
Fibers may be present but specialized cells do not occur

Protophloem	Metaphloem
It is the first formed phloem when the plant organ is growing.	It is the later formed phloem which differentiates when the plant organ has completed its growth.
It is less prominent.	It is more prominent.
It is made up of smaller and narrower elements.	It is made up of longer and broader elements.
Sieve areas or pores are not prominent.	Sieve areas or pores are quite prominent.
Companion cells are often absent.	Companion cells are usually present.
Protophloem is short lived and gets crushed.	It is long lived and can be crushed during secondary growth.
In the region of crushed protophloem, fibers often develop from specialized cells.	Fibers may be present but specialized cells do not occur.