The most acceptable theory of ascent of sap is ............................

Explanation

**Step-by-Step Solution:**

1. **Understanding the Ascent of Sap**: The ascent of sap refers to the upward movement of water and nutrients from the roots of a plant to its leaves. This process is crucial for the plant's survival and functioning.

2. **Identifying the Most Accepted Theory**: The most widely accepted theory explaining the ascent of sap is the **Cohesion-Tension Theory**.

3. **Origin of the Theory**: This theory was proposed by scientists **Dixon and Jolly in 1894**. They explained the mechanisms behind how water moves upward in plants.

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