The volume of the tissue system is increased by
Mass meristem
Rib meristem
File meristem
Plate meristem
1. Mass Meristem: These meristematic cells divide into all planes through anticlinal divisions (perpendicular to the outer surface). They cause an increase in volume. For example, the formation of the cortex.
2. Plate Meristem: These meristematic cells divide into two planes through anticlinal divisions. They cause an increase in area. For example, the formation of the lamina of the leaf and epidermis.
3. Rib or File Meristem: These meristematic cells divide only in one plane and cause an increase in length. For example, the formation of the lateral root.
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Mass Meristem cells divide into all planes through anticlinal divisions (perpendicular to the outer surface). They cause an increase in volume. For example, the formation of the cortex.