Question

Difference between xylem and phloem tissues

Answer 1

xylem is That tissue which transport the water in different parts of a plant.

phloem is that tissue which transport food particles in different parts of plants

Answer 2

☆Phloem
• Transportation of food and nutrients such as sugar and amino acids from leaves to storage organs and growing parts of plant. This movement of substances is called translocation.
• Bidirectional (Moves up or down the plant's stem from "source to sink").
•Roots, stems and leaves. transports sucrose to growth (roots and shoots) and storage regions of the plant (seeds fruit and swollen roots).
•Forms vascular bundles with xylem.
•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.
•Sieve tubes, companion cells, phloem parenchyma (loosely packed resulting in intercellular spaces which allows gas exchange), bast fibers, intermediary cells.
•Living tissue with little cytoplasm but no nucleus/tonoplast.
•Phloem is not star shaped.
•Phloem occur on outer side of the vascular bundle.
☆Xylem
•Water and mineral transport from roots to aerial parts of the plant.
•Unidirectional (Moves up the plant's stem).
•Roots, stems and leaves.
•Forms vascular bundles with phloem and gives mechanical strength to plant due to presence of lignin cells. The lignified secondary wall also makes the xylem waterproof and prevent it from collapsing under the pressure of water transpiration.
•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.
•Tracheids, vessel elements, xylem parenchyma (loosely packed resulting in intercellular spaces which allows gas exchange), xylem sclerenchyma
•Dead tissue at maturity so it is hollow with no cell contents
•Xylem is star shaped.
•xylem occupy the center of the vascular bundle.