the softer parts of the bodies of plants are made up mostly of cellulose.It is the cellulose which enables a plant to bend and have flexibility.
nearly all green plants manufacture cellulose for their own use. It is made up of the same chemical elements as is sugar,namely,carbon,hydrogen,and oxygen.These materials are found in air and water.The sugar which is formed in the leaves is dissolved in the sap of the plant and soaks all through the body of the plant.Most of it goes to those places in the plant where growth or repair is taking place and part of this sugar is changed into cellulose. The plant uses it to make the walls of new cells.