A file like rasping organ for feeding called Radula, present in the phylum

Options

A. hemichordata
B. mollusca
C. echinodermata
D. arthropoda

Answer

To solve the question regarding the file-like rasping organ for feeding called radula, we will follow these steps:

### Step-by-Step Solution:

1. **Understanding the Term "Radula":**
- The radula is a specialized feeding organ found in certain animals. It is often described as a file-like structure that helps in scraping or cutting food.

2. **Identifying the Function of Radula:**
- The primary function of the radula is to scrape algae or other food sources off surfaces, such as rocks. It can also be used to drill through the shells of prey, allowing the organism to access the soft tissues inside.

3. **Examining the Options Provided:**
- The question provides four options:
- A) Hemichordata
- B) Mollusca
- C) Echinodermata
- D) Arthropoda

4. **Analyzing Each Option:**
- **Hemichordata:** This phylum includes marine animals like acorn worms, which do not possess a radula.
- **Mollusca:** This phylum includes snails, slugs, and other mollusks that are known to have a radula.
- **Echinodermata:** This phylum includes starfish and sea urchins, which do not have a radula.
- **Arthropoda:** This phylum includes insects, arachnids, and crustaceans, which also do not possess a radula.

5. **Conclusion:**
- Based on the analysis, the only phylum that contains organisms with a radula is **Mollusca**. Therefore, the correct answer is **B) Mollusca**.

### Final Answer:
**B) Mollusca**