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 primary growth of the plant, allowing it to increase in length. The cells in the apical meristem are undifferentiated, meaning they can develop into various types of plant tissues. As the apical meristem produces new cells, they differentiate into specialized tissues such as leaves, stems, and flowers. This process is crucial for the plant's development and overall health, enabling it to adapt to its environment and optimize resource acquisition.