1) FRAGMENTATION: It is an asexual method of reproduction. The breaking up of a body of a simple multicellular organism into two or more pieces on maturing, each of which subsequently grows to form a complete new organism, is called Fragmentation. The breaking up of an organism occurs only when the parent organism is mature.
2) BUDDING: It is an asexual method of reproduction. In Budding, a small part of the body of the parent organism grows out as a 'bud' which later detaches and becomes a new organism.
3) SPORULLATION: It is also and asexual method of reproduction. In Sporullation, the parent produces hundreds of microscopic reproductive units called 'spores'.
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Fragmentation-----  It is the process in Spirogyra..when these splits into fragements ..every fragments grows into mature ones...

Budding ------  A new organism develops from an outgrowth or bud due to cell division at one particular site....It is in Hydra....

Spourillation ----- 
Sporulation is the formation of nearly dormant forms of bacteria . In a limited number of bacteria, spores can preserve the genetic material of the bacteria when conditions are inhospitable and lethal for the normal (vegetative) form of the bacteria.