The main function of phloem parenchyma is to store food and other substances like resins, latex and mucilage. They also help in transport of food.

Cuticle It is a waxy coating covering the entire plant body surface. It is absent in roots, it prevents the loss of water through the surface of the plant body.

Bulliform cells check the water loss. Bulliform or motor cells are modified epidermal cells present in monocots or grasses. Under stressed conditions, they help in shutting down stomata and thus reduce water loss through transpiration.

(a) Radial Vascular Bundle The xylem and phloem are present on the separate radii of the root. This arrangement of vascular bundle is known as radial vascular bundle.

(b) Polyarch Xylem When many strands of xylem are present, it is referred to as polyarch condition-a characteristic feature of monocot root.

(c) Well Developed Pith Dicot stem and monocot roots have well developed pith formed of parenchymatous cell with intercellular spaces..

Bulliform cells are bubble shaped cells present in grasses. Loss of turgor pressure in these cells causes leaf to curl during water stress, thus reduce transpiration.