If cohesion-tension transpiration pull theory is correct, a break in water column should
(a) Increase water content of leaves
(b) Increase rate of photosynthesis
(c) Cause wilting of leaves
(d) Have no effect at all

Options

A. Increase water content of leaves
B. Increase rate of photosynthesis
C. Cause wilting of leaves
D. Have no effect at all

Answer

To solve the question regarding the effects of a break in the water column according to the cohesion-tension transpiration pull theory, we can analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding the Cohesion-Tension Theory**:
- The cohesion-tension theory explains how water is transported in plants. It relies on the cohesive forces between water molecules and the adhesive forces between water and the xylem vessels. A continuous column of water is necessary for effective water transport from roots to leaves.

**Hint**: Remember that the cohesion-tension theory relies on a continuous water column.

2. **Identifying the Impact of a Break in the Water Column**:
- If there is a break in the water column, it disrupts the continuous flow of water. This break can occur due to air bubbles (cavitation) or other factors that interrupt the water column.

**Hint**: Consider what happens when the water column is interrupted.

3. **Evaluating Each Option**:
- **(a) Increase water content of leaves**: A break in the water column would not increase the water content of leaves; instead, it would lead to reduced water supply.
- **(b) Increase rate of photosynthesis**: Photosynthesis requires water, but if the water supply is inadequate due to a break, the rate of photosynthesis would likely decrease, not increase.
- **(c) Cause wilting of leaves**: A break in the water column leads to inadequate water supply to the leaves, resulting in loss of turgidity and causing wilting.
- **(d) Have no effect at all**: A break in the water column will have a significant effect, particularly on water transport and leaf health.

**Hint**: Analyze how each option relates to the availability of water in the plant.

4. **Conclusion**:
- The correct answer is **(c) Cause wilting of leaves**. A break in the water column disrupts water transport, leading to wilting due to insufficient water reaching the leaves.

### Final Answer:
(c) Cause wilting of leaves