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The correct answer for the question above is letter a. The main function of cellulose in plants is to provide physical support. Cellulose makes plants parts strong. For instance, the stems, leaves and branches are rigid because of the tough walls that surrounds the cells.
1 The main function of a plant cells is to carry all processes that are needed to facilitate plant life.  The structure of the plant cell includes cellulose, chloroplasts, chlorophyll and vacuoles. Plasma membrane, nucleus, nucleolus and mitochondria are also included in the structure of a plant cell. The endoplasmic reticulum, Golgi apparatus and microtubules are other features of the plant cell.