Transportation in Planaria

Planaria is a type of flatworm that belongs to the phylum Platyhelminthes. These worms are found in freshwater and moist terrestrial habitats and have a simple, yet effective transportation system.

Planaria 

The transportation in planaria is achieved through a network of muscles that run longitudinally and transversely along the length of their body. These muscles contract and relax in a coordinated manner, allowing the worm to move forward and change direction. Planaria also have a layer of cilia on their ventral surface, which helps in locomotion by creating a current of water to move the worm along.

Apart from muscles and cilia, planaria also have an excretory system, which plays a role in transportation. The excretory system is made up of specialized cells called flame cells that remove waste and excess water from the worm's body. The flame cells also help in maintaining osmotic balance by regulating the concentration of ions in the worm's body fluids. This, in turn, helps the planaria to maintain its shape and stability, which aids in efficient movement.

The transportation in planaria is a combination of muscular contractions, ciliary action, and the excretory system. These mechanisms work together to help the worm move around and navigate its environment.