What is transpiration? Name the cells that regulate transpiration.

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Transpiration:**
- Transpiration is the process through which plants lose water, primarily in the form of water vapor. This process is essential for maintaining the plant's water balance and facilitating nutrient transport.

2. **Mechanism of Transpiration:**
- The loss of water occurs through small openings in the leaves known as stomata. These stomata allow water vapor to escape into the atmosphere.

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