When some dry soil is added to water in a beaker and stirred with a glass rod, bubbles are seen coming out of the soil. What do these bubbles consist of ?

Options

A. Water vapour
B. Only oxygen gas
C. Air
D. None of these

Explanation

To answer the question about the bubbles that form when dry soil is added to water in a beaker and stirred, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Experiment**: When dry soil is added to water in a beaker and stirred, we observe bubbles forming. This indicates that some gas is being released.

2. **Composition of Soil**: Soil is composed of various components, including minerals, organic matter, water, and air. The air is trapped in the spaces between the soil particles.

3. **Adding Water**: When water is added to the soil, it fills the spaces between the soil particles. As the water enters these spaces, it displaces the air that was previously present.

4. **Formation of Bubbles**: The air that was trapped in the soil is released as the water displaces it. This escaping air forms bubbles that rise to the surface of the water in the beaker.

5. **Conclusion**: The bubbles that are seen coming out of the soil consist primarily of air. Therefore, the correct answer to the question is that the bubbles consist of air.

### Final Answer:
The bubbles consist of air.

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