A farmer observed drops of water along the margins of leaves of tomato plants growing in his well irrigated field on a winter morning. Give reasons for this occurrence. Why the water drops appeared only along the leaf margins?

Explanation

### Step-by-Step Solution:

1. **Understanding Guttation**: The phenomenon observed by the farmer is known as guttation. Guttation is the process where water is exuded from the leaves of plants, particularly during the night or early morning when transpiration is low.

2. **Conditions Favoring Guttation**: Several factors contribute to the occurrence of guttation:
- **Low Transpiration**: During the night or early morning, the rate of transpiration (the loss of water vapor from the plant) is significantly reduced due to lower temperatures and humidity levels.
- **High Soil Moisture**: Since the tomato plants are growing in a well-irrigated field, the soil has ample moisture, which encourages the roots to absorb more water.

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