The most economic insect is

Options

A. Silver fish
B. Desert locust
C. Bombyx mori
D. Dragon fly.

Answer

To determine the most economic insect from the given options, we will analyze each insect's economic importance.

### Step-by-Step Solution:

1. **Understanding Economic Importance**:
- Economic insects are those from which we can derive products that have commercial value.

2. **Analyzing the Options**:
- **Silverfish**:
- Description: A primitive insect often found in damp areas, particularly in books.
- Economic Importance: Silverfish do not have any significant economic value. They are more of a nuisance than a beneficial insect.
- Conclusion: Not the correct answer.

- **Desert Locust**:
- Description: A type of grasshopper known for its swarming behavior.
- Economic Importance: Desert locusts are considered pests as they can cause severe damage to crops, leading to economic loss rather than gain.
- Conclusion: Not the correct answer.

- **Bombix mori (Silkworm)**:
- Description: The larval stage of the silk moth, which is domesticated for silk production.
- Economic Importance: Silkworms are crucial for the silk industry. The process of obtaining silk from them is called sericulture, and silk is used to make various high-value products, including clothing.
- Conclusion: This is the correct answer.

- **Dragonfly**:
- Description: An insect known for its agility and predatory habits.
- Economic Importance: Dragonflies do not have significant economic value and are primarily beneficial for controlling pest populations.
- Conclusion: Not the correct answer.

3. **Final Answer**:
- Based on the analysis, the most economic insect from the options provided is **Bombix mori (Silkworm)**.