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)

Figure

Epidermis

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

Same as that of dicot root

Cortex

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

Same as that of dicot root

Endodermis

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

Pericycle

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.

Pith

Small and inconspicuous

Large and well-developed

Vascular bundle

Single (Monoarch)

More than six (Polyarch)


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