Which of the following statement is correct regarding ctenophores?

Options

A. Eight pairs of median comb plates help in locomotion
B. They exhibit indirect development via phyra larval stage
C. Statocyst is located at oral end
D. They are hermaphrodite animals showing extrnal fertillisation

Answer

To determine which statement is correct regarding ctenophores, let's analyze each option step by step:

### Step 1: Analyze Option 1
- **Statement**: Ctenophores have 8 pairs of median plates that help in locomotion.
- **Evaluation**: This statement is incorrect. Ctenophores have 8 comb plates (also known as ctenes) that are transversely arranged, not median plates. These comb plates are responsible for locomotion, not pairs of median plates.

### Step 2: Analyze Option 2
- **Statement**: Ctenophores exhibit indirect development via a FIRA larval stage.
- **Evaluation**: This statement is also incorrect. Most ctenophores undergo direct development without a distinct larval stage. While some species may show variations, the general characteristic is direct development.

### Step 3: Analyze Option 3
- **Statement**: The statocyst is located at the oral end.
- **Evaluation**: This statement is incorrect. Statocysts, which are balance organs in ctenophores, are located in the aboral region (away from the mouth) and not at the oral end.

### Step 4: Analyze Option 4
- **Statement**: Ctenophores are hermaphroditic animals and show external fertilization.
- **Evaluation**: This statement is correct. Ctenophores possess both male and female reproductive organs within the same individual, allowing them to produce both male and female gametes. The fertilization process occurs externally.

### Conclusion
Based on the evaluations of each option, the correct statement regarding ctenophores is:
- **Ctenophores are hermaphroditic animals and show external fertilization.**

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