Question

Why are xylem and phloem known as complex tissues???

Answer 1

Because as they are made up of more than one type of cells. These cells work in a coordinated manner, as a unit, to perform the various functions of the xylem and phloem. ... Tracheids are elongated, thick-walled dead cells with tapering ends

Answer 2

When a plant tissue is made up of only one type of cell and they all do the same work, such a tissue is called as simple tissue.

When a plant tissue is made up of many kinds of cells, all working in coordination for a common main function we call the tissue as complex tissue.

Xylem and Phloem are complex because they are made different cells, with different roles.

Xylem is made up of tracheids, parenchyma and xylem vessels. They conduct water and minerals up, give mechanical support and store food for the the plant and plant tissue. All these types of cells are different yet work as a unit, in combination and in coordination.

Phloem tissue is made up of seive tubes, companion cells, parenchyma and Phloem fibres. These cells conduct food to all parts of the plant, give mechanical support to the stems and branches, store food and maintain pressure for the continuous conduction of prepared food from leaves to all parts of the plant.

Xylem and Phloem are together called as vascular bundles.

Shown below a cross section of a stem showing Xylem and Phloem.

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