How are meristerms classified based on position?

Explanation

Based on position, meristerms are classified into three types.
1. Apical meristem:
i. it present in the apices of root and shoot. It is responsible for increase in the length of the plant.
ii. This kind of growth is called as primary growth.
2. Intercalary meristem:
i. It occurs between the mature tissues.
ii. It is responsible for elongation of internodes. Eg: Grass.
3. Lateral meristem :
i. it occurs along the longitudinal axis of stem and root.
ii. Vascular cambium and cork cambium (phellogen) are example for lateral meristem.
iii. it is responsible for secondary tissues and thickening of stem and root.