Why meristematic tissues do not have vacuoles?
Meristematic tissues are responsible for cell division and growth in plants. They are found at the growing tips of roots and stems. One key characteristic of meristematic tissues is the absence of vacuoles, which are present in mature plant cells.

Cell Division and Growth
Meristematic tissues have high rates of cell division and growth, which require a large amount of cytoplasm and cell organelles to support these processes. Vacuoles, which are membrane-bound organelles filled with cell sap, would take up space that could be used for more cytoplasm and organelles needed for rapid cell division.

Flexibility and Plasticity
The absence of vacuoles in meristematic tissues also provides them with greater flexibility and plasticity. Vacuoles in mature plant cells serve functions such as storing water, nutrients, and waste products. In meristematic tissues, not having vacuoles allows for more flexibility in cell shape and structure as they rapidly divide and differentiate into various cell types.

Energy and Nutrient Utilization
Meristematic tissues rely heavily on energy and nutrients for their rapid growth and division. Without vacuoles, the cells can utilize resources more efficiently for these processes. Vacuoles, while important for storage in mature cells, would not be as beneficial in meristematic tissues where the focus is on growth and division.
In conclusion, the absence of vacuoles in meristematic tissues is a strategic adaptation to support their high rates of cell division, growth, flexibility, and efficient energy utilization.