Fission means dividing of parent cell into two or more parts. It is of two types binary and multiple fission. Amoeba is an example of binary fission and plasmodium is an example of multiple fission. Regeneration means if any part of an organism is cut down and it grows with that part fully known as regeneration. Example Planaria.
Fission: Fission means division. During asexual reproduction, the parent cell divides into two or more cells. Unicellular organisms show different patterns of cell division according to their cell structure. For example, an amoeba can divide itself into two at any plane but the division in euglena is longitudinal.Fission can be of two types, namely, binary fission and multiple fission. In binary fission, parent cell divides into two equal halves called daughter cells. Daughter cells are identical to each other and to their parent cell. Organisms like the amoeba, bacteria, euglena, etc., exhibit binary fission.Regeneration: When a lizard loses its tail, it grows a new one. This is known as regeneration. In many organisms, there are specialized cells, which can differentiate and grow into a new organism. Organisms like hydra and planaria also show regeneration. In these organisms, when the cell divides into numerous pieces, each piece proliferates and differentiates to regenerate new organisms.\xa0