Eating the food with all nutrients helps in replacement of protoplasm [cell].Thus the cell retains their shapes.
Plants cells retain their shape using a cell wall whereas animals cells retain shape with their cell membranes.
controls what get in and out of the cell and shapes the cell
The Cell Wall
Their different shapes help them to perform their various functions (jobs)
cell membrane and cell wall
cell wall
In an animal the structure and support of the being doesn't depend on the strength of each cell but in a plant cell the structure depends on the strength and rigidity of the cell. Therefore, the plant cell has the regular shapes.
Plant cells contain a cell wall that helps retain the rigidity of the cell.
cylindrical shape doesn't describe for the bacterial cell shapes
Round , rod and spiral .
Vacuoles
Cells are different shapes and sizes because they have different functions. The functions dictate the shapes and sizes.