Anisogamy is the type of sexual reproduction, in which isogametes (gamete having same shape and size) fuse and form a diploid zygote, eg, Plasmodium.
Schizogamy is an asexual phase in protozoans which is merely a simple multiple fission of shizont.
The Plasmogamy is the union of protoplasts of two cells. This process generally takes place before karyogamy, i.e., before nucleus fusion, in a sexual reproduction process. Plasmotomy is a special type of binary fission.