(i) Cytoplasm is the fluid present between the cell membrane and the nucleus. Organelles of cells are present in the cytoplasm. These are mitochondria, Golgi bodies, ribosomes, etc. Cytoplasm is made up of basic elements like C, H, O, and N. They are found in the form of carbohydrates, proteins and water.

(ii) Nucleus of a cell is generally spherical and located in the centre of the cell. Nucleus is separated from the cytoplasm by a membrane called the nuclear membrane. Nucleus also contains nucleolus and chromosomes. Nucleus helps in inheritance and acts as control centre of the activities of the cell.