Question

What will happen, when: (i) a mature spirogyra filament attains considerable length (ii) Planaria gets cut into two pieces.

Answer 1

i. Fragmentation occurs
ii. Regeneration occurs.

Answer 2

1. When the mature filament of a spirogyra attains considerable length the filament breaks up into smaller fragments or pieces, and each fragment grows into a new filament/individual.
2. regeneration occur