Q. In a longitudinal section of a root, starting from the tip upward, the four zones occur in the following order:
Solution:
The root system of a plant develops from the hypocotyl of the embryo of a seed. The root shows following four regions these usually merge into one another, without distinct boundaries between them. Region of Cell Maturation Region of Cell Elongation Region of Cell Division Regions of the root The zones, successively from the apex to the base are- (i) Root cap zone : The apex of each root is covered by a cushion of thin walled cells known as root cap. (ii) Region of cell division : It lies just behind the root cap. It is the main growing region of the root where active cell divisions take place. (iii) Region of elongation : The region of elongation is responsible for growth in length of the root. (iv) Region of maturation : Epidermal cells of this region give out small, thin, cylindrical unicellular outgrowths, known as root hairs. These are the main absorbing organs of the root
