Cells make up tissues. A tissue is a group of cells with a specific function in the plant. Tissues can be simple or complex. There are three basic cell types in plants. E.G. the cortex of the root.
Primary function is storage.
Have primary cell walls only. Rectangular in section view. You might find these beneath the epidermis in a stem for example to help support the plant. Primary wall is cellulose, secondary wall is lignin and cellulose . Cells usually dead after secondary wall thickening, function in support and conduction when dead.