Which of the following statement is not true?

Options

A. Transpiration is increased when root shoot ratio is increased
B. Transpiration is increased when latex & mucilage is increased in tissue
C. Transpiration is decreased when stomata are sunken
D. Transpiration is decreased when leaves becomes leathery or hairy

Answer

To solve the question "Which of the following statement is not true?" regarding transpiration in plants, we will analyze each of the provided statements one by one.

### Step-by-Step Solution:

1. **Analyze the First Statement:**
- **Statement:** "Transpiration is increased when root-shoot ratio is increased."
- **Analysis:** This statement is true. A higher root-shoot ratio indicates that the plant has a larger root system relative to its shoot system, which allows for better water absorption. Consequently, increased water absorption can lead to increased transpiration.

2. **Analyze the Second Statement:**
- **Statement:** "Transpiration is increased with the latex and mucilage is increased in tissue."
- **Analysis:** This statement is not true. While latex and mucilage can protect plants, particularly hydrophytes, they do not directly increase transpiration. In fact, the presence of mucilage may help retain water rather than promote its loss through transpiration.

3. **Analyze the Third Statement:**
- **Statement:** "Transpiration is decreased when stomata are sunken."
- **Analysis:** This statement is true. Sunken stomata reduce the exposure of the stomatal openings to the air, which decreases the rate of transpiration since less water vapor can escape.

4. **Analyze the Fourth Statement:**
- **Statement:** "Transpiration is decreased when leaves become leathery or hairy."
- **Analysis:** This statement is also true. Leathery or hairy leaves reduce water loss by creating a barrier to evaporation, thus decreasing transpiration.

### Conclusion:
The statement that is not true is the **second statement**: "Transpiration is increased with the latex and mucilage is increased in tissue."