How are the modes for reproduction different in unicellular and multicellular organisms?

Unicellular organisms generally reproduce by asexual methods like budding, binary fission, multiple fission, fragmentation, spore formation. Variation is not common in their progeny.

On other hand, multicellular organisms can divide by sexual as well as asexual methods. For example, vegetative propagation in plants is a means of asexual reproduction while all higher animals reproduce sexually. Variation is seen in sexually reproducing organisms.