Spirogyra reproduces by fragmentation. In this process the body of mother breaks down into fragments or pieces. Each fragment has an ability to reproduce itself. 
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Vegetative reproduction in spirogyra takes place by fragmentation of the filament. Spirogyra alsp reproduces sexually by a process called conjugation. Conjugation results in the fusion of two units from the same filament or two different filaments. A zygote is formed which germinates and gives rise to a new filament
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