1. What are the changes you see in symmetry when looking at animals from phylum
ID: 220079 • Letter: 1
Question
1. What are the changes you see in symmetry when looking at animals from phylum Porifera through phylum Chordata? What are the changes you see in the level of organization and body cavity type when looking at animals from phylum Porifera through phylum Chordata? 2. 3. What are the changes you see in the digestive system? 4. What are the changes you see in the nervous system? 5. What are the changes you see in the circulatory and respiratory systems? 6. What are the changes you see in the type of body support?Explanation / Answer
1. Poriferans have asymmetrical body whereas chordates have bi-laterally symmetrical body.
2. Poriferans are diploblastic animals whereas chordates are triploblastic in nature. Poriferans don't have any body cavity where as true coelom is present in chordates.
3. Poriferans have choanocytes in their canal system whereas chordates have advanced digestive system with digestive glands.
4. Nervous system is absent in poriferans but chordates carry a well developed nervous system.
5. Circulation in poriferans are mediated by water whereas chordates have well characterised blood circulatory system. Respiratory system is absent in poriferans but chordates have highly developed respiratory system.
6. Body is supported by spicules in poriferans. In case of chordates it is supported by specialized skeletal system.
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