The process by which the organism moves under its own efforts due to biological needs is called locomotion.
Movement of hydra: Different types of movement of hydra are looping, somersaulting, gliding, floating, swimming, crawling, stooping, diving and contraction-expansion of the body.
1. Looping
The process by which hydra moves by creating loops is called looping movement. Hydra exhibits looping movements to cover long distances.
(i) In this process the hydra stands upright on the trajectory by the foot.
(ii) Bends the head forward and touches the trajectory by the Karshika.
(iii) A loop is formed between the sole and the head when the base is touched by the nematocyst of Karshika.
(iv) Then pull the feet closer to the head.
(v) Retouches the trajectory by treading.
(vi) Stands straight again with the head raised on the floor.
(vii) Then moves forward bending the head forward.
By forming a loop like this, the hydra moves forward.
2. Somersaulting
Hydra’s fast movement mechanism is somersaulting. Each run creates two loops.
(i) In this process the hydra touches the trajectory by the sole.
(ii) Standing upright by resting on the floor.
(iii) Touches the trajectory by the Karshika with the head facing forward.
(iv) Stand upside down by lifting the feet on the karshika.
(v) Release Karshika by resting on the floor and stand upright with the head up.
Thus the hydra moves forward through digbazi.
3. Gliding or amoeboid movement: Hydra moves by gliding process to cover very short distances. In this process the hydra moves as slowly as the amoeba. A slippery sap is secreted from the cells of the epidermis of the soles of hydra. It creates a moment from the place of the feet. Momentarily moves forward on smooth ground. At the same time, the Hydra moves forward very slowly. In this way, the hydra very slowly crosses a very small distance.
4. Floating: The hydra moves upside down by freeing the feet. That is, the foot is on the top and the oral floor is on the bottom. Gas and mucus are secreted from the glands of the soles of the feet. The released gas and mucus combine to form bubbles. Hydra floats in water with the help of bubbles. During this time, it floats from one place to another due to the pull of the current or the impact of the waves.
5. Swimming: The hydra frees the body and positions itself horizontally. Makes the karshikas move like waves. At the same time, it also moves the body. In this way, it swims by creating a wave-like movement.
6. Walking: Hydra moves upside down by freeing the soles. That is, the foot is on the top and the oral floor is on the bottom. Places the entire weight of the body on the Karshika. Using Karshika as a foot moves slowly. Dr. Siddiq Publications
7. Climbing: Hydra clings to branches of submerged plants by tentacles. Releases and shrinks the soles. Then put the floor in a new place. Thus changes the space through contraction.
8. Contraction and expansion: Hydra relaxes the body and causes contraction and expansion of muscle cells. In this the body size becomes shorter and longer. As a result, a kind of movement is created and the place changes.
9. Drawing: If bubbles are not created in the body, the body becomes heavy. The body sinks faster due to its heaviness. It is called submerged movement. Dr. Siddiq Publications