The approximate length of root hair zone in plants
a)	1-10 cm	b)	1-15 cm	c)	1-6 cm	d)	1-20 cm

(c)

Zone of cell differentiation or root hair zone is the most efficient region of water absorption in plants, which is made up of thousands of root hairs. This zone is 1-6 cm in length. Root hairs are specialised to absorb water and are 0.05-1.5 mm in length and 10 um in breadth