Answer: Unicellular organisms reproduce asexually by binary fission, multiple fission and budding.
- Binary fission: the parent cell divides into two equal daughter cells. The nucleus divides first, then the cytoplasm. Examples: Amoeba, Paramoecium, bacteria.
- Multiple fission: in unfavourable conditions the nucleus divides many times inside a cyst, and many daughter cells are released. Examples: Plasmodium, Amoeba.
- Budding: a small outgrowth (bud) forms on the parent cell, receives a daughter nucleus and separates to live independently. Example: yeast.