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Question

Ctenophores and jellyfish resemble each other in being:

A
Diploblastic and coelomate
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B
Diploblastic and acoelomate
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C
Triploblastic and acoelomate
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D
Triploblastic and pseudocoelomate
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Solution

The correct option is B Diploblastic and acoelomate
Body wall of Ctenophores and jellyfishes consist of two germ layers - ectoderm and endoderm and are described as being diploblastic. They do not have mesoderm, instead, they have a mass of undifferentiated cells called mesoglea. Ctenophores and jellyfishes also do not have a body cavity, so are called acoelomate.

Organisms which have all the three germ layers - ectoderm, endoderm and mesoderm - are called triploblastic. Annelids and Mollusca are examples of phyla with triploblastic animals.

Animals which do not have a true coelom are called pseudocoelomate. Members of phylum Aschelminthes are all pseudocoelomates. Animals that are triploblastic and acoelomates belong to Platyhelminthes and members of Aschelminthes are triploblastic and pseudocoelomates.

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