Water reaches great heights in the trees because of suction pull caused by ______.

Explanation

**Step-by-Step Solution:**

1. **Understanding Water Transport in Trees**: Water is absorbed by the roots of trees from the soil. This water needs to travel up to the leaves, which are located at the top of the tree.

2. **Role of Transpiration**: The process that helps in moving water from the roots to the leaves is known as transpiration. Transpiration is the process where water evaporates from the surface of the leaves.

3. **Mechanism of Transpiration**: As water evaporates from the leaves, it creates a negative pressure (suction pull) in the leaf's air spaces. This negative pressure helps draw more water up from the roots through the xylem vessels.

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