Workers in deep mines usually suffer from dehydration because:-

Options

A. Water is lost due to evaporation
B. Water is lost due to defeacation
C. Water is lost in the form of urine
D. Water is lost along with salts in the form of sweat

Answer

### Step-by-Step Solution

1. **Understanding Dehydration**:
- Dehydration occurs when the body loses more water than it takes in, leading to insufficient water levels in the body.

2. **Conditions in Deep Mines**:
- Deep mines are characterized by high temperatures, which can lead to increased sweating among workers.

3. **Effect of High Temperatures**:
- High temperatures in deep mines cause workers to sweat more. Sweating is the body’s mechanism to cool down.

4. **Water Loss through Sweating**:
- When workers sweat, they lose water from their bodies. This loss of water can lead to dehydration if not replenished.

5. **Loss of Salts**:
- Along with water, salts are also lost through sweat. This can further complicate dehydration as the body needs both water and electrolytes to function properly.

6. **Analyzing the Options**:
- **Option A**: Water is lost due to evaporation - Incorrect, as evaporation does not specifically cause dehydration.
- **Option B**: Water is lost due to defecation - Incorrect, as this is not specific to deep mines.
- **Option C**: Water is lost in the form of urine - Incorrect, as this is a normal bodily function and not specific to deep mines.
- **Option D**: Water is lost along with salts in the form of sweat - Correct, as this is the primary reason workers in deep mines suffer from dehydration.

7. **Conclusion**:
- The correct answer is that workers in deep mines usually suffer from dehydration because water is lost along with salts in the form of sweat.