Question

what happens when matured spirogyra bursts

Answer 1

Spirogyra reproduces asexually by fragmentation. On maturation, it breaks into smaller fragments and each fragment by mitosis grows into individual plants.

Answer 2

It release spores which germinate into new mycelium in moist conditions.

Explanation

When the sporangia of Rhizopus burst upon maturation, it releases spores which germinate into new mycelium in moist condition.