in Morphology of Flowering Plants by
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The radicle of the embryo develops to primary or tap root. The tap root grows vertically down the soil. The primary root branches and rebranches to produce secondary and tertiary root respectively. The tap roots with these branches altogether constitute the tap root system. It is also a characteristic feature of the dicot plants. The adventitious roots are those developed from the plant parts other than the radicle of the embryo. Adventitious roots along with the branches and rebranches together constitute the adventitious root system. The adventitious root modified to perform food storage, mechanical support and some other vital functions.