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Cnidarians
Cnidarians are aquatic animals belonging to the phylum Cnidaria. Common cnidarians include to jellyfish, sea anemones, corals and the Portuguese Man o' War. Questions about all species of cnidarians can be directed here.
669 Questions
How can tourists protect coral reefs?
by looking after the animal(s) and caring for them, you could get in a little group to save them
Why does hydra reproduces asexually?
Hydra can produce offspring asexually by budding, which is when a baby hydra develops on the body of the hydra. It is fed by the parent through their cells until the baby is developed enough to catch its own food. It will drop off the parent and begin its independent life soon after it is able to catch its food. This type of reproduction produces a clone of the parent plant.
Hydra can also reproduce sexually, using sperm and egg. In some species of hydra the
male and female are separate individuals , while in other species male and female reproductive structures occur on the same individual, so they are hermaphrodites. Whichever the type, the sperm are released into the water and if they find an egg the egg is fertilized and grows into a new hydra. This type of reproduction produces an offspring with traits of both parents.
Hydra do not have an endoskeleton. They are multicellular organisms that can be found in unpolluted fresh-water ponds, streams, and lakes.
What does a cnidarian do with its food after it stings it?
Cindarians usually eat fish that they stun with their tentacles. "Farming their Food: Almost all cnidarians are carnivorous. Many eat small creatures or trap detritus, plankton and other microscopic titbits. But many also capture and eat large prey. Many cnidarians, however, more supplement their meals with food provided by photosynthetic zooxanthellae (symbiotic single-celled algae) that they harbour in their tentacles and bodies. These algae produce food from sunlight. In exchange, the cnidrian provides protection and simple minerals. " http://www.wildsingapore.com/chekjawa/text/p500.htm
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The definition of 'hydra-headed evils' is 'problems that grow in strength when met with inadequate responses.' This term (and definition) alludes to the classical myth of the many-headed Hydra-beast, which grew two heads in place of one that had been cut off.
How many heart chambers do cnidarians have?
This will depend upon the insect that you are talking about. Some have only two chambers and others can have a lot more.
Are hydra vertebrates or invertebrates?
Hydra are invertebrates. They have no back bone/spinal column.
Where do cnidarians digest their food?
Hmmm, Mrs Perry's class I see. It occurs in the gastrovascular cavity.
How do cnidarians obtain oxygen?
Cnidarians are able to absorb the oxygen they need from the surrounding water by diffusion.
The Hydra did not have a proper name. It lived in the swamps near the city of Lerna and because of its reptilian-like characteristics it was described as a Ύδρα (Hydra) or "Hydrus" which is Latin for "water serpent".
The Greek word "hudro"means "water snake"
What are the two body forms of cnidarians and make a sketch of each below?
Hydra - the polyp, anchored with a stalk, tentacles up; and medusa, the jellyfish, swimming free, tentacles down. All cnidarians have both stages, like larva and adult, but they spend more time in one of them and are known as that stage, for example anemones and jellyfish. Anemones have a tiny jellyfish dispersal stage, and jellyfish have a tiny polyp reproduction stage.
What do cnidarians use to defend themselves?
cnidarians have stinging cells called nematocysts located on their tantacles
What is the color of the star hydrae?
a hydra depending on the species can be a multitude of colors, green is just the most common. Hydra is actually a genus of many species.
