$\rightarrow$ In majority of the dicotyledonous plants, the direct elongation of the radicle leads to the formation of primary root that grows inside the soil.

$\rightarrow$ It bears lateral roots of several orders that are referred to as secondary, tertiary, etc. roots.

$\rightarrow$ Tap Root System : The primary roots and its branches constitute the tap root system. e.g. mustard plant.

$\rightarrow$ tap root system : the primary roots and its  branches  constitue the tap root system. As seen  replaced  by a large number of roots.

$\rightarrow$ Fibrous Root System : In monocotyledonous plants, the primary root is short lived and is replaced by a large number of roots.

$\rightarrow$ These roots originate from the base of the stem and constitute the fibrous root system, as seen in the wheat plant.

$\rightarrow$ In some plants, like grass, monstera and the banyan tree, roots arise from parts of the plant other than the radicle and are called adventitious roots.

$\rightarrow$ Functions : The main functions of the root system are shown below :

$(i)$  Absorption of water and minerals from the soil.

$ (ii)$  Providing a proper anchorage to the plant parts.

$ (iii)$  Storing reserve food material.

$ (iv)$  Synthesis of plant growth regulators.