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These tissues are the active regions and so they remain young and fresh throughout the lifetime. These are the basic tissues which in the future develop into the organs of the plants. Each meristem is divided into the others. The cells that are at first which undergo the cell division are called initial meristems and the cells that come from the cell divisions are called derivative meristems. Based on the location and function meristematic tissues are classified into three types. They are
(1) Apical meristem
(2) Intercalary meristem
(3) Lateral meristem
Apical meristem:
These meristems are present at the tip regions of root, shoot, and leaves. They are the active regions in the cell division which helps in the growth and the elongation of root and shoot. It gives rise to new leaves and hence these are referred as primary tissues in the plant growth.
Intercalary meristem:
These meristems appear below the apical meristems and they are matured more than apical meristem. Intercalary meristem and the apical meristem are called primary meristem, because they appear in the earlier part of plant’s growth. These meristems help in the regeneration of a plant's part when it is detached or grazed by animals.
Lateral meristem:
They are called a secondary meristem because they occur at the later part of the plant growth. They are the matured tissues that occurred at the base of the shoot and top of the root.
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