What is one of the purposes of the secondary cell wall?

The secondary cell wall is primarily known for its role in providing additional strength to the plant cell. This is largely due to the presence of lignin, a complex organic polymer that reinforces the cellulose fibers within the wall. As plants mature, they may develop a secondary cell wall, which not only enhances structural support but also contributes to the rigidity and durability of tissues, particularly in woody plants. This additional layer allows plants to withstand various physical stresses, making it essential for overall plant stability and growth.

While other functions related to cell walls, such as nutrient storage or water conservation, are important, they do not directly pertain to the primary structural role that the secondary cell wall plays due to lignin.