Which of the following plant factor affects transpiration

Options

A. Number and distribution of stomata, number of stomata open, temperature
B. Temperature, light, humidity, wind speed
C. Canopy structure, water status of plant, number and distribution of stomata and number of stomata open(%)
D. Canopy structure, number and distribution of stomata and humidity of air

Answer

To answer the question, "Which of the following plant factors affects transpiration?", we need to identify the internal factors that influence the process of transpiration in plants. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand Transpiration
Transpiration is the process by which water vapor is lost from the aerial parts of the plant, primarily through small openings called stomata. It is influenced by various factors, both internal and external.

### Step 2: Identify Internal Factors
Internal factors are characteristics related to the plant itself that can affect transpiration. These include:
- **Number and Distribution of Stomata**: More stomata can lead to higher rates of transpiration.
- **Percentage of Open Stomata**: If more stomata are open, transpiration rates increase.
- **Canopy Structure**: The arrangement of leaves can affect how much light and air reach the stomata.
- **Water Status of the Plant**: Adequate water availability can enhance transpiration.

### Step 3: Distinguish Between Internal and External Factors
It is crucial to differentiate between internal and external factors:
- **External Factors**: These include temperature, humidity, wind speed, and light. For example, higher temperatures can increase transpiration rates, while higher humidity can decrease them.
- **Internal Factors**: As mentioned, these are related to the plant's anatomy and physiology.

### Step 4: Analyze the Options
Given the question, we need to look for options that list internal factors affecting transpiration. Based on the analysis:
- **Correct Internal Factors**: Number and distribution of stomata, percentage of open stomata, canopy structure, and water status of the plant.
- **Incorrect Options**: Any option that includes external factors like temperature, humidity, or wind speed would be incorrect.

### Step 5: Conclusion
After evaluating the options, the correct answer is the one that includes only internal factors affecting transpiration.

### Final Answer
The correct option is the one that lists the following internal factors:
- Number and distribution of stomata
- Percentage of open stomata
- Canopy structure
- Water status of the plant