Question

What is common amongst tapeworm, liver fluke and planarian?

• A. They are all segmented
• B. They all have flattened bodies
• C. They are all found in gut
• D. They all have a coelom

Answer 1

Answer: (B)

They all have flattened bodies

Tapeworm, liver fluke and planarian belong to the phylum Platyhelminthes. The most important and common characteristic of all organisms belonging to this phylum is that their bodies are dorso-ventrally flattened. Since the bodies of these organisms are flat, they do not have a body cavity and are acoelomate. Additionally, their bodies are unsegmented.

So, the correct answer is option B.