The significance of the cell wall for plants lies in its crucial role in providing structural support and protection. Composed mainly of cellulose, the cell wall helps maintain the plants' shape and prevents excessive water loss. It also serves as a barrier against pathogens and physical damage, enhancing plant resilience. Additionally, the cell wall plays a role in regulating transport of materials between cells and contributes to growth by allowing the cells to expand. Without a robust cell wall, plants would struggle to survive in diverse environments.