Where is cellulose found in a cell and what is its function?

Cellulose isn't exactly cytoplasm, but it also give the cell protection. Hope this helped :) It provides water for the plants

provide support for the cell structure for A+

The basic function of cellulose is to form the shape of a plant cell.
Cellulose stores energy
in humans cellulose serves no purpose,but in plants it is used in the cell wall.
Cellulose has many functions, the most important are for plant cell walls and human digestion. The human cannot actually digest cellulose but it is fibrous and keeps people "regular".