Upon contact with prey, the contents of the nematocyst are explosively discharged, firing a dart-like thread containing neurotoxins into whatever triggered the release. This is surrounded by a ring of tentacles whose length varies according to the species in question. Hydra has a tubular, radially symmetric body up to 10 mm (0.39 in) long when extended, secured by a simple adhesive foot called the basal disc.

Most species are sessile but some can, if conditions require, move over short distances by repeatedly looping the body over onto the substrate. The fertilized eggs secrete a tough outer coating, and, as the adult dies (due to starvation or cold), these resting eggs fall to the bottom of the lake or pond to await better conditions, whereupon they hatch into nymph Hydra. As a result, green Hydra have a big advantage over brown Hydra which lacks the, This is only possible as long as green Hydra is exposed to sunlight. [6], Respiration and excretion occur by diffusion throughout the surface of the epidermis, while larger excreta are discharged through the mouth.[7][8]. As this grows, a separate mouth and set of tentacles develops until eventually a replicate daughter cell of the parent hydra is produced. All Rights Reserved The feeding behaviour of Hydra demonstrates the sophistication of what appears to be a simple nervous system. [10] When conditions are harsh, often before winter or in poor feeding conditions, sexual reproduction occurs in some Hydra. These stem cells will continually renew themselves in the body column.

In 2010, Preston Estep published (also in Experimental Gerontology) a letter to the editor arguing that the Martinez data refute the hypothesis that Hydra do not senesce. Hydra: An outline of Life processes.

(2012). At the free end of the body is a mouth opening surrounded by one to twelve thin, mobile tentacles.

Once conditions normal resume, the outer casing dissolves and the embryo recommences life.

Many members of the Hydrozoa go through a body change from a polyp to an adult form called a medusa, which is usually the life stage where sexual reproduction occurs, but Hydra do not progress beyond the polyp phase.[12]. Be sure to take the utmost precaution and care when performing a microscope experiment. Explain the movement of the hydra if live specimens are available.

Here, the Hydra uses its tentacles as legs to move from one point to another. - Located in the endoderm and play an important role in digestion. Dr. Nikunj Bhatt. Each tentacle, or cnida (plural: cnidae), is clothed with highly specialised stinging cells called cnidocytes. - This type of movement involves the use of tentacles.

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