Name the factors which affect the rate of transpiration. How this process is useful to plants?

Explanation

### Step-by-Step Solution

**Step 1: Define Transpiration**
Transpiration is the process by which plants lose water in the form of vapor through small openings called stomata. This process primarily occurs during the daytime when the stomata are open.

**Step 2: Identify External Factors Affecting Transpiration**
1. **Light**: Transpiration rates increase with light because stomata open during the day to allow gas exchange.
2. **Temperature**: Higher temperatures increase the rate of transpiration as warmer air can hold more moisture.
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