During rainy season, earthworms are found on the surface of the soil due to 

Options

A. more aereation
B. to consume water
C. burrous are flooded with water
D. elimination of castings

Answer

**Step-by-Step Solution:**

1. **Understanding Earthworm Habitat:**
- Earthworms typically live in soil and create burrows for movement and respiration. They rely on moist environments to survive.

2. **Effect of Rain on Soil:**
- During the rainy season, the soil becomes saturated with water. This leads to flooding of the burrows where earthworms reside.

3. **Respiration in Earthworms:**
- Earthworms perform cutaneous respiration, which means they exchange gases (oxygen and carbon dioxide) through their moist skin. Their skin is highly vascularized, allowing for efficient gas exchange.

4. **Impact of Flooded Burrows:**
- When the burrows are flooded with water, the earthworms cannot perform respiration effectively because the water fills their burrows, limiting access to oxygen.

5. **Behavioral Response:**
- To avoid suffocation and ensure they can breathe, earthworms come to the surface of the soil during the rainy season.

6. **Conclusion:**
- The primary reason earthworms are found on the surface during the rainy season is that their burrows are flooded with water, making it impossible for them to respire underground.

**Final Answer:**
- Earthworms are found on the surface of the soil during the rainy season because their burrows are flooded with water.

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