A biting and chewing apparatus found in Echinus is

Options

A. Radula
B. Aristotle's Iantern
C. Rostrum
D. None of the above.

Answer

### Step-by-Step Solution:

1. **Identify the Organism**: The question refers to "Echinus," which is commonly known as the sea urchin. It belongs to the phylum Echinodermata.

2. **Understand the Class**: Echinus is classified under the class Echinoidea, which includes sea urchins and sand dollars.

3. **Function of the Apparatus**: The question specifically asks about a biting and chewing apparatus. In sea urchins, this apparatus is used for feeding.

4. **Name the Apparatus**: The biting and chewing apparatus found in Echinus is called "Aristotle's lantern." This structure is made up of five strong and sharp teeth that allow the sea urchin to scrape and chew food.

5. **Comparison**: Aristotle's lantern is named after the ancient Greek philosopher Aristotle, who first described it. Its structure resembles a lantern, which is where it gets its name.

6. **Eliminate Incorrect Options**: Other terms like "radula," "rostrum," or "none of the above" do not pertain to sea urchins. The radula is a feeding organ found in mollusks, not echinoderms.

7. **Final Answer**: Therefore, the correct answer to the question is that the biting and chewing apparatus found in Echinus is called "Aristotle's lantern."