Question

Short note on Platyhelminthes.

Answer 1

Answer:

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• These are triploblastic (body made up of three layers of

cells), dorsoventrally flattened, (flattened from back through to the abdomen) leaf-like animals.

•They have tissue level of organisation. So, these are also called

flatworms.

• They have bilateral symmetry i.e. the left and right halves of

the body has the same design.

• There is no true internal body cavity or coelom.

• They are either free living or parasitic animals (living in the bodies of other animals) like liver fluke and some are free-living like Planaria.

• Examples, Taenia solium (pork

tapeworm), Dugesia (Planaria), Fasciola (liver fluke), etc.

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Answer 2

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