What are meristematic tissues? Explain with the help of suitable diagram. Give their classification on the basis of their position in the plant body.
Meristematic tissues are the tissues in which the cells divide continuously and help in increasing the length and girth of the plant.
According to their position in the plant, meristems are of three types:
a) Apical Meristems - These are situated at the growing tip of the stems and roots and increase the height of the plant.
b) Lateral Meristems - These are found beneath the bark and in vascular bundles of dicot roots and stems. These are responsible for the growth of cambium and hence increases the girth of the plant.
c) Intercalary Meristems - They are located at the base of leaves or internodes or below the nodes. It increases the length of the plant.