NUCLEUS is the largest floating body generally in centre of a cell .
.The function of nucleus is to control all the activities of the cell .The nucleus contains a tiny round structure called nucleolus.Nucleus is a large , spherical organelle present in all the cells .In animal cells ,nucleus lies in the cell whereas in plant cells the nucleus may be on the periphery of the cell.Nucleus is the largest organelles in a cell.Nucleus may be stained and seen easily with the help of microscope.Nucleus is separated from the cytoplasm by a membrane called nuclear membrane..