What happens when Planaria is cut into pieces?

When Planaria (a flatworm) is cut into pieces, each piece regenerates into a complete new organism. This is called regeneration.

• Planaria has totipotent stem cells called neoblasts that can differentiate into any cell type.
• Even 1/300th of the body can regenerate a whole worm.
• Also used as a natural form of asexual reproduction through fragmentation.
• Makes Planaria a key model organism for stem cell research.

Summary: When cut, each piece of Planaria regenerates into a complete new organism through totipotent stem cells true regeneration.