What are meristems in plants?

Meristems are specialized regions in plants where actively dividing plant cells are concentrated. These zones are crucial for the growth and development of various plant structures, such as stems, roots, and leaves. Meristems can be classified into different types, including apical meristems, found at the tips of roots and stems, and lateral meristems, which contribute to the thickness of the plant. The continuous division of cells in these areas allows for elongation and the formation of new tissues throughout the plant's life cycle.

Other options refer to different plant components or functions. Regions of dormant cells are generally not involved in active growth; instead, they may serve different purposes when conditions are favorable. Storage tissues are primarily responsible for storing nutrients and energy reserves rather than contributing to growth. Vascular tissues play a role in transporting water and nutrients but are not involved in cell division like meristems are. Thus, the definition of meristems as zones of actively dividing plant cells highlights their essential role in the dynamic growth processes of plants.