Plant (internal) factor(s) that affect transpiration in

Options

A. Number and distribution of stomata
B. Percent of open stomata
C. Canopy structure and water status of the plant
D. All of the above

Answer

**Step-by-Step Text Solution:**

1. **Understanding Transpiration**:
- Transpiration is defined as the loss of water in the form of vapor from the plant, primarily through small openings called stomata.

2. **Identifying Internal Factors**:
- Internal factors affecting transpiration are those related to the plant's anatomy and morphology.

3. **Number of Stomata**:
- The number of stomata on a leaf significantly influences the rate of transpiration. More stomata mean a greater potential for water vapor loss. For example, if a leaf has a high number of stomata, it will lose more water compared to a leaf with fewer stomata.

4. **Distribution of Stomata**:
- The location of stomata on the leaf surface also affects transpiration. Stomata located on the upper surface of the leaf (epistomatic leaves) will experience more exposure to sunlight, leading to increased transpiration compared to stomata located on the lower surface (hypostomatic leaves).

5. **Percentage of Open Stomata**:
- The percentage of stomata that are open at any given time directly affects transpiration rates. For instance, if 50 out of 100 stomata are open, transpiration will be higher than if only 20 out of 100 are open.

6. **Canopy Structure**:
- The structure of the plant canopy can also influence transpiration. A denser canopy can reduce transpiration rates due to shading and reduced airflow.

7. **Water Status**:
- The water status of the plant plays a crucial role in transpiration. Plants that have abundant water (hydrophytes) will transpire more, as they have more water available to lose.

8. **Conclusion**:
- All the mentioned factors (number of stomata, distribution of stomata, percentage of open stomata, canopy structure, and water status) are internal factors that affect the rate of transpiration in plants.

**Final Answer**: All the above statements regarding internal factors affecting transpiration are correct.

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