Mutual attraction between water molecules is (A)____ while attraction of water molecules to polar surfaces (such as the surface of tracheary elements) is called (B)_____

Answer

To solve the question, we need to identify the terms that describe the interactions of water molecules with each other and with polar surfaces.

### Step-by-Step Solution:

1. **Understanding the Mutual Attraction Between Water Molecules**:
- Water molecules are attracted to each other due to hydrogen bonding. This property is known as **cohesion**. Cohesion allows water molecules to stick together, which is essential for processes like the movement of water through plants.

**Hint**: Think about how water forms droplets; this is due to the attraction between water molecules.

2. **Understanding the Attraction of Water Molecules to Polar Surfaces**:
- When water molecules are attracted to other substances, particularly those that are polar (like the surfaces of tracheary elements in plants), this property is called **adhesion**. Adhesion helps water to climb up through the xylem against the force of gravity.

**Hint**: Consider how water spreads on a glass surface; this is an example of water molecules adhering to a polar surface.

3. **Finalizing the Answers**:
- Based on the definitions:
- (A) The mutual attraction between water molecules is called **cohesion**.
- (B) The attraction of water molecules to polar surfaces is called **adhesion**.

### Final Answer:
(A) Cohesion
(B) Adhesion