Here's why:
* Structure: Cellulose is a long, straight chain of glucose molecules linked together. These chains bind together to form strong fibers, providing structural support to plant cells.
* Abundance: Cellulose is the most abundant organic compound on Earth, making up a significant portion of plant cell walls.
* Function: It gives plants their rigidity and strength, allowing them to stand upright, withstand wind, and support their weight. It also helps to protect the plant from damage.
While other carbohydrates like hemicellulose and pectin also contribute to plant cell wall structure, cellulose plays the primary role in providing strength and rigidity.