Observe the relationship between first two words and then fill the suitable word/words at the fourth place.
Root hairs : Water absorption :: Vessels : .........................

Explanation

To solve the analogy "Root hairs : Water absorption :: Vessels : .................", we need to analyze the relationship between the first pair of words.

1. **Identify the relationship in the first pair**:
- Root hairs are specialized structures that play a crucial role in the process of water absorption in plants. They increase the surface area of the roots, allowing for more efficient uptake of water from the soil.

2. **Determine the function of the second term in the analogy**:
- Vessels, specifically xylem vessels, are responsible for transporting water and nutrients from the roots to the rest of the plant. This process is known as the ascent of sap, which refers to the upward movement of water through the plant.

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