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Standard IX
Biology
Porifera and Cnidaria
True coelom o...
Question
True coelom or body cavity occurs in
A
Hydra
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B
Taenia
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C
Pheretima
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D
Sycon
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Solution
The correct option is
B
Pheretima
Pheretima
is a common earthworm belonging to Phylum Annelida. It has a well-developed true coelom.
Taenia
is a common tapeworm belonging to Phylum Platyhelminthes. It is acoelomate.
Sycon
(Phylum Porifera) and
Hydra
(Phylum Coelenterata) are also acoelomate animals.
So, the correct answer is option C.
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There is no true internal body cavity or coelom in
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Explain body cavity or coelom in animals.
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Read the following statements
(i) True coelom is a body cavity which arises as a cavity in the embryonic mesoderm.
(ii) Digestive cavity is found in acoelomates, pseudocoelomates as well as coelomates.
(iii) The body cavity of arthropods and non-cephalopod molluscs is called haemocoel.
(iv) Aschelminthes possess true body cavity.
(v) There is no cavity between the body wall and gut in Echinoderms.
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