1. Radial symmetry: The cnidarians show radial symmetry which means that their body parts are arranged around a central axis. This helps them to sense their surroundings from all directions.
2. Diploblastic organization: Cnidarians have two tissue layers - the ectoderm and endoderm which are separated by a gelatinous layer called mesoglea.
3. Tentacles: Cnidarians have tentacles that surround their mouth which is located on the top surface of the body. These tentacles help in capturing prey and also contain stinging cells called nematocysts.
4. Gastrovascular cavity: Cnidarians have a gastrovascular cavity which serves as both a digestive and circulatory system. The cavity has only one opening which serves as the mouth and the anus.
5. Nerve net: Cnidarians have a simple nervous system called a nerve net which allows them to sense their environment and respond to stimuli.
6. Reproduction: Cnidarians are capable of both sexual and asexual reproduction. Asexual reproduction occurs by budding while sexual reproduction involves the release of gametes into the water.
7. Polymorphism: Cnidarians show polymorphism which means that they exist in different forms such as medusa and polyp.
8. Habitat: Cnidarians can be found in a variety of aquatic habitats such as coral reefs, freshwater ponds, and the open ocean.
what are the characteristics of of cnidaria
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