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Fibrous root:

In some plants like monocotyledonous (corn and rice) the primary root is short lived and is replaced by a large number of fine roots of similar diameter. These roots originate from the base of the stem and constitute the fibrous root system.

Adventitious root:

Adventitious roots do not develop from another root.

In some plants, like GRASS, MONSTERA and BANYAN TREE, many roots arise from parts of the plant (from a stem, leaf or other plant parts) other than the radicle. These types of roots are called adventitious roots.

REFERENCE:

Image: http://chadcaton.edublogs.org/files/2010/01/ROOT-systems-THIS-ONE-241x300.jpg

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