Oct 2, 2009

Roots and their types in flowering plants

Roots are the underground part of the plant. They anchor the plant firmly in the soil. They also absorb water and soil from the soil.

On the basis of mode of origin, roots are of following two types.

1) Tap Roots 2) Adventitious Roots

In Tap Roots, the first root formed by the elongation of the radical of the embryo is called primary root. This may give branches (secondary roots) which in turn may produce other branches (tertiary roots). If the primary root persists and becomes thicker than its secondary and tertiary branches, it is called tap root.

Adventitious roots are formed from parts of the plant (stem and leaves) other than the radical of the embryo are called adventitious roots. If you have seen some of old Banyan tree or a rubber plant, you might have noticed adventitious roots hanging downward from branches of tree. Money plant and Ivy have adventitious clinging roots which firmly attach the plant to the wall or a tree trunk. Some roots grow downward into the soil from the lower nodes of the stem e.g. in maize and sugarcane. These are also adventitious roots.

There are also roots which are Fibrous and Tuberous. These roots are like fibers and tubes, thick and swollen which store food in them. Tuberous tape roots are found turnip, radish and carrot while adventitious tuberous roots are present in Asparagus.

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