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Platyhelminthes

Flatworms hav...

Question

Flatworms have three tissue layers and only one body cavity-the digestive cavity.
They are called as

A

Pseudoacoelomates

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B

Acoelomates

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C

Pseudocoelomates

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D

Coelomates

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Solution

The correct option is B Acoelomates
Acoelomate is any organism that lacks a cavity between the body wall and the digestive tract. Porifera, cnidaria, Platyhelminthes are acoelomate.
Therefore, the correct answer is option B.

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Q. Choose the correct answers from the alternatives given.
Animals that have three layers of embryonic tissue and have one solid mass of tissue rather than tissues and organs nestled inside a body cavity are:

Q. Choose the correct answers from the alternatives given.
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Q. 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, pseudocoelmates as well as coelomates
iii) The body cavity of arthropods and non-cephaloped molluscs is called haemocoel
iv) Aschelminthes possess true body cavity
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Q. 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.
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In ________, a two-layered body wall encloses a single cavity in which digestion takes place.

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