How are the modes for reproduction different

solution:
Unicellular organisms reproduce by binary fission (e.g. Amoeba, Paramecium), multiple fission (e.g. Plasmodium), budding (e.g. Yeast), spore formation (e.g. Bacteria, Amoeba), but multicellular organisms reproduce by means of budding (e.g. Hydra), fragmentation (e.g. Spirogyra), regeneration (e.g. Hydra), vegetative propagation in all plants and sexual reproduction in all higher plants and animals.