Plant cell wall is composed of an important substance known as ___________.

The most important features distinguishing the cells of plants from those of animals is the presence of cell wall in plants. This wall protects the cellular contents. A plant's cell wall is composed of several compounds among which cellulose is the most important. Cellulose is made up of molecules of the sugar glucose. Cellulose molecules are united into fibrils (layers of fibres), which form the structural framework of the wall. Other components of cell walls are lignin (provide rigidity) and waxes (reduce water loss from cells).