Study the following and pick up the correct statements:
I. As the binary fission in Paramecium occurs parallel to longitudinal axis of the body, it is called homotheogenic fission.
II. As the daughter Paramecia formed after binary fission are like mirror images, the fission is called symmetrogenic fission.
III. Multiple fission in Amoeba is called sporulation.
IV. Union of pronuclei of the gametes is called amphimixis.