An undifferentiated layer, mesoglea, is present in between the ectoderm and the endoderm in:
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Correct answer: Coelenterata
In diploblastic animals like Coelenterates and Ctenophores, the mesoglea serves as a non-cellular jelly-like layer between the two germ layers. Triploblastic animals replace this with a cellular mesoderm.
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More Basis of Animal Classification questions
- Radial symmetry is observed in which of the following phyla?
- When the body can be divided into identical left and right halves in only one plane, the symmetry is called:
- The body cavity which is lined by mesoderm is called:
- In some animals, the body cavity is not lined by mesoderm; instead, the mesoderm is present as scattered pouches. This is known as:
- Which of the following phyla is characterized by the absence of a body cavity (acoelomate condition)?
- Metameric segmentation (metamerism) is a characteristic feature of: