Cellulose is polymer of : -

Cellulose is a straight-chain polysaccharide made of $\beta$-D-glucose units joined by $\beta(1\rightarrow4)$ glycosidic linkages.
It is the main constituent of plant cell walls.
(Starch and glycogen are polymers of $\alpha$-D-glucose; fructose polymers are called fructans, e.g. inulin.)
So cellulose is a polymer of glucose.