Point out the differences in the anatomy of root of sunflower(Helianthus annuus) and maize (Zea mays).

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Dicot and Monocot Root

Tissue organization

Dicot (Sunflower)

Monocot (Maize)



Has a single layer of epidermal cells, some of which protrude to form root hairs

Same as that of dicot root


Has several layers of thin-walled parenchymatous cells, with intercellular spaces

Same as that of dicot root


Single layer of barrel-shaped cells, without intercellular space, and contains Casparian strips (water impermeable layer consisting of waxy suberin)

Same as that of dicot root


Has thick-walled parenchyma

Initiation of lateral roots and vascular cambium during the secondary growth takes place in these cells.

Secondary growth is absent in monocots.


Small and inconspicuous

Large and well-developed

Vascular bundle

Single (Monoarch)

More than six (Polyarch)


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