Primary growth in plants is brought about by the activity of the

Primary growth in plants is brought about by the activity of the meristem. Meristem is a specialized tissue in plants that contains undifferentiated cells that can divide and differentiate into various plant cell types. These cells are responsible for the growth in length of roots and shoots in a process known as primary growth. The meristem is located at the tips of the roots and shoots and is responsible for the formation of new tissues that elongate and expand the plant body. As the meristem cells divide, some become part of the root cap, which protects the root as it grows through the soil, while others become part of the apical meristem, which gives rise to the primary tissues of the root and shoot. Therefore, meristem is responsible for the continuous growth of the plant throughout its life cycle.