Which one is absent in Beroe?

Options

A. Statocyst
B. Stomodaeum
C. Tentacles
D. Anal pores.

Answer

**Step-by-Step Solution:**

1. **Understanding Beroe**: Beroe is a type of ctenophore, commonly known as a comb jelly. It is characterized by its transparent body and sac-like structure.

2. **Identifying Key Features**: Beroe has several notable features:
- It has a mouth located on one side of its body.
- It possesses internal gonads.
- It has an absence of tentacles.

3. **Analyzing the Options**:
- **Option 1: Statocyst**: This structure is present in Beroe and helps with balance and orientation.
- **Option 2: Stomodium**: This structure is also present in Beroe and is involved in feeding.
- **Option 3: Tentacles**: Beroe is unique among ctenophores because it lacks tentacles.
- **Option 4: Anal pores**: These are present in Beroe and are used for excretion.

4. **Conclusion**: Since Beroe lacks tentacles, the correct answer to the question "Which one is absent in Beroe?" is **Tentacles**.

**Final Answer**: Tentacles are absent in Beroe.

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