Round worms possess a ----------------symmetry

Options

A. Radial
B. Bilateral
C. Biradial
D. Spherical

Answer

**Step-by-Step Solution:**

1. **Understanding Symmetry in Animals**: Symmetry in animals can be classified into different types. The two main types are bilateral symmetry and radial symmetry.

2. **Defining Bilateral Symmetry**: Bilateral symmetry means that an organism can be divided into two equal halves by a single plane that runs through the center. This type of symmetry is common in many animals, including humans.

3. **Defining Radial Symmetry**: Radial symmetry allows an organism to be divided into equal halves by multiple planes passing through the center. An example of this is a jellyfish or an apple, where you can slice it in many ways and still get two equal halves.

4. **Identifying the Symmetry of Roundworms**: Roundworms, which belong to the phylum Aschelminthes (or Nemathelminthes), exhibit bilateral symmetry. This means they can be divided into two equal halves by one specific plane.

5. **Conclusion**: Therefore, the correct answer to the question is that roundworms possess bilateral symmetry.

**Final Answer**: Round worms possess a **bilateral** symmetry.

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