write the characteristics of coelenterates
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Dipoblastic body with two layers of cells, outer layer called ectoderm or epidermis and the inner layer known as the endoderm or gastrodermis.
2. Phylum coelenterata characteristics is they have a single opening into the body which acts as both the mouth and anus which functions in taking food and expelling wastes.
3. Coelenterates contain body cavity known as the coelenteron, where the digestion of food occurs. The name coelenterata for these animals is coined due to this character.
4. Existance as tubular sessile polyp forms and swimming medusa forms is also phylum coelenterata characteristics.
5. Polyp bodies often contain exoskeleton and endoskeleton.
6. These skeletons are generally composed of minerals like calcium carbonate.
7. Medusae generally have only hydrostatic skeletons.
8. Coelenterates are generally carnivorous in nature, except some species, such as coral, that get some of their food from special symbionts living within them.
9. They lack such sensory organs like eyes.
10. They hunt food passively i.e., they just wave their tentacles and when prey does come in contact with the tentacles using special structures known as nematocysts either inject a toxin that paralyses and/or kills the prey, or entangles the prey.
2. Phylum coelenterata characteristics is they have a single opening into the body which acts as both the mouth and anus which functions in taking food and expelling wastes.
3. Coelenterates contain body cavity known as the coelenteron, where the digestion of food occurs. The name coelenterata for these animals is coined due to this character.
4. Existance as tubular sessile polyp forms and swimming medusa forms is also phylum coelenterata characteristics.
5. Polyp bodies often contain exoskeleton and endoskeleton.
6. These skeletons are generally composed of minerals like calcium carbonate.
7. Medusae generally have only hydrostatic skeletons.
8. Coelenterates are generally carnivorous in nature, except some species, such as coral, that get some of their food from special symbionts living within them.
9. They lack such sensory organs like eyes.
10. They hunt food passively i.e., they just wave their tentacles and when prey does come in contact with the tentacles using special structures known as nematocysts either inject a toxin that paralyses and/or kills the prey, or entangles the prey.
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→ Coelentrata also known as Cnidaria.
→ This name of cnidaria is due to single cavity Coelenteron .
→ Cnidarian have tissue but don't have organ or organ system. That's why they posses tissue level of organization.
→ They are Radially symmetry and Diploblastic.
* Radial Symmetry :- The body can be divided into two equal halves by a single plane passing through the centre from top to bottom.
* Diploblastic :- Animals in which two layers namely endoderm and ectoderm are present are known as Diploblastic animals.
→ No separate body cavity.
→ They have incomplete digestive system. It has a single aperture mouth but don't have anus.
→ They respire through body surface by diffusion.
→ They excrete through body surface by diffusion.
→ Segmentations are absent in them.
→ Tentacles are present in them which act as appendages.
→ They are mostly marine, aquatic animals and free-living animals.
→ They reproduce both sexually and asexually.
→ Ex :- Sea-pan, Sea-fan, Brain coral etc.
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