The apical meristem is a region of actively dividing cells located at the tips of roots and shoots in plants. This tissue is responsible for the growth in length, allowing the plant to extend its roots deeper into the soil and its shoots higher into the air. Apical meristems are crucial for the development of new leaves, flowers, and branches. They contain undifferentiated cells that can differentiate into various types of plant tissues, contributing to the overall growth and health of the plant. This process is essential for the plant's ability to adapt to its environment.