Primary structure of monocot and dicot shoot and more information and explanation about it

Monocot plants are marked by seeds with a single cotyledon, parallel-veined leaves, scattered vascular bundles in the stem, the absence of a typical cambium, and an adventitious root system. ... The taproot or primary roots in such a system have a vascular cambium and are thickened by secondary growth.

Dicot roots also contain one main root called the taproot, where other, smaller roots branch off. They have two photosynthetic cotyledons in the seed that may emerge from the ground when the seed germinates

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