Question

differences in the structure of xylem and phloem

Answer 1

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Structure
Phloem :
Elongated, tubular shape with thin walled sieve tubes. The sieve tubes have pores at each end in the cross walls and microtubules that extend between sieve elements allowing longitudinal flow of material.


Xylem :Tubular shape with no cross walls which allows a continuous column of water + facilitates more rapid transport within the xylem vessels. There are two types - protoxylem (first formed xylem) + metaxylem (mature xylem) depending on pattern of lignin.

Source : http://www.diffen.com/difference/Phloem_vs_Xylem

Answer 2

simple xylem is considered to be dead tissue n has only one type living cell that is xylem parenchyma whereas the phloem is considered living tissue and have only one type of cell that is dead ie phloem fiber.