Construct an explanation for why a plant has both a rigid cell wall and a cellular membrane?

Plants have both a rigid cell wall and a cellular membrane to serve distinct yet complementary functions. The cell wall, primarily composed of cellulose, provides structural support, protection against mechanical stress, and helps maintain turgor pressure, which is essential for plant rigidity. The cellular membrane, on the other hand, regulates the movement of substances in and out of the cell, facilitating communication and nutrient uptake. Together, these structures enable plants to maintain their shape while efficiently managing cellular processes.