Where is the basal disk located on a hydra?

The basal disk of a hydra is located at its base, serving as the attachment point to the substrate or surface it inhabits. This disc-shaped structure allows the hydra to anchor itself securely, enabling it to remain stationary while feeding and interacting with its environment. The basal disk also plays a role in locomotion, as the hydra can use it to glide or move by contracting and expanding.