Name the structure through which ascent of sap takes place.

Explanation

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the structure responsible for the ascent of sap in plants. The term "ascent of sap" refers to the upward movement of water and nutrients within the plant.

2. **Identifying the Process**: The ascent of sap primarily involves the movement of water, which occurs through a specific type of vascular tissue in plants.

3. **Recognizing the Vascular Tissues**: In plants, there are two main types of vascular tissues: xylem and phloem. Xylem is responsible for transporting water and minerals from the roots to the rest of the plant, while phloem transports food.

...