Question Video: Recalling the Typical Characteristics of Flatworms | Nagwa Question Video: Recalling the Typical Characteristics of Flatworms | Nagwa

Question Video: Recalling the Typical Characteristics of Flatworms Biology • First Year of Secondary School

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Which of the following is not a typical characteristic of a flatworm (platyhelminth)? [A] Having a body divided into distinct segments [B] Having a body composed of three layers [C] Having a bilaterally symmetrical body [D] Having a flattened body and a head

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Video Transcript

Which of the following is not a typical characteristic of a flatworm, or platyhelminth? (A) Having a body divided into distinct segments. (B) Having a body composed of three layers. (C) Having a bilaterally symmetrical body. Or (D) having a flattened body and a head.

Organisms belonging to the phylum Platyhelminthes, also known as flatworms, have many characteristics in common. Let’s look through the answer choices to see which do match typical characteristics of flatworms.

First, as the name suggests, flatworms are flat, with the anterior and posterior of their bodies being easily identifiable. So we can eliminate answer (D). Flatworms are triphoblastic. This means that their bodies are made up of three layers. So, we can also eliminate answer (B). In addition, flatworms are bilaterally symmetrical. This means if they were cut in half lengthwise, both halves would be identical. So we can eliminate answer (C) as well. Flatworms are not segmented.

So the correct answer to this question is (A). Flatworms do not typically have bodies divided into distinct segments.

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