A detrivorous animal of economic importance is
(A) Leech
(B) Earthworm
(C) Fowl
(D) Caterpillar larva

Options

A. Leech
B. Earthworm
C. Fowl
D. Caterpillar larva

Answer

To solve the question "A detrivorous animal of economic importance is," we need to analyze each of the given options to identify which one is a detrivorous animal and has economic significance.

### Step-by-Step Solution:

1. **Understanding Detrivorous Animals**:
- Detrivorous animals are organisms that feed on detritus, which consists of decomposing organic matter. They play a crucial role in the ecosystem by breaking down dead material and recycling nutrients back into the soil.

2. **Analyzing Option A: Leech**:
- Leeches are primarily blood-feeding organisms. They do not consume detritus or contribute to the decomposition of organic matter. Therefore, they are not considered detrivorous.

3. **Analyzing Option B: Earthworm**:
- Earthworms are classic examples of detrivorous animals. They consume decaying organic matter and help in the decomposition process. This activity enriches the soil with nutrients, making them economically important for agriculture and soil health.

4. **Analyzing Option C: Fowl**:
- Fowls, such as chickens, primarily feed on seeds and insects. They do not feed on detritus and thus do not qualify as detrivorous animals.

5. **Analyzing Option D: Caterpillar Larva**:
- Caterpillar larvae primarily feed on leaves. They are herbivores and do not consume decomposing organic matter, making them unsuitable as a choice for a detrivorous animal.

6. **Conclusion**:
- After analyzing all the options, it is clear that the only detrivorous animal listed that has significant economic importance is the Earthworm (Option B). They contribute to soil fertility and are essential for agricultural practices.

### Final Answer:
**(B) Earthworm**

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