Define root. Write briefly the types of root system.

Explanation

The root is usually an underground part of the plant which helps in fixation and absorption of water. The radicle of the embryo develops into a primary root or tap root.
Types of Root system :
The root system is generally of two types. They are,
1. Tap root system and
2. Adlventitous root system.
1. Tap root system : The tap root system develops from the radicle of the germinating seed. It is also called the normal root system. The radicle develops into a primary root which grows vertically downwards and becomes the tap root. The tap root is the ture root. It produces many lateral roots in an acropetal manner, endogenously which grow obliquely. The tap root system is present in dicotyledonous plants.
2. Adentitious root system : The root system that develops from, any part of the plant body other than the radicle is called the adventious root system. It is mostly seen in monocotyledonous plants. In grasses, fibrous root system is present, which is a type of adventitious root system. In this case 'the primary root formed from the radicle dispdears soon. Then many slender roots develop from the base of the stem as cluster of fibres, hence called the fibrous root system.