Reconstruction of lost or damaged body parts is called regeneration. Hydra has great regenerative capacity due to its totipotency. The Swiss scientist Abraham Tremley (1744) was the first to observe the hydra’s ability to regenerate. Cutting a hydra into pieces creates a hydra from each piece. Karshika and hypostome are formed from the oral end and padachakati from the non-oral end. Dr. Siddiq Publications
1. If the hydra is divided into several segments transversely, each segment creates a complete hydra. Each segment maintains polarity. That is, from the oral end, karshika and hypostome are formed and from the non-oral end, the foot-disc is formed.
2. If the hydra body is divided lengthwise into two parts, a complete hydra is created from each part.
3. If the head of hydra is divided into two parts vertically, one head is created from each part.
The creature is named Hydra after the mythical monster Hydra in Greek mythology. This monster had nine heads. If the strong human Hercules cut off the head of the monster, two heads grew in that place. Dr. Siddiq Publications