Tonoplast is a membrane of vacuole, which is a space within the cytoplasm of a living cell that is filled with air, water and other liquid, cell sap or food particles.
Cytoplasm is the material surrounding the nucleus of a cell. It consists of a matrix, in which the cell's organelles are suspended. It is bounded by plasma membrane.
Nucleus (L-Nucleus-Kernel) is a specialised double membrane bound protoplasmic body, which contains all the genetic information for controlling cellular metabolism and transmission.