Question

Short / Long answer type questions.
Give a brief account of complex tissue present in plants.

Answer 1

Xylem and phloem are the complex tissues which constitute the component parts of the vascular bundle. They are also called vascular tissues.

• Xylem:

It is primarily ins­trumental for conduction of water and solutes, and also for mechanical support. Primary xylem originates from the procambium of apical meristem, and secondary xylem from the vascular cambium. As a complex tissue, it consists of different types of cells and elements, living and non-living.

• Phloem:

The other specialized complex tissue forming a part of the vascular bundle is phloem It is composed of sieve elements, companion cells, parenchyma, and some fibres. Sclerotic cells may also be present. Phloem is chiefly instrumental for transloca­tion of organic solutes—the elaborated food materials in solution. The elements of phloem originate from the procambium of apical meristem or the vascular cambium.