During high wind velocity, the stomata

Options

A. Open more widely
B. Close down
C. Remian unaffected
D. Remain uniffected but lose more water due to mass action

Answer

To solve the question "During high wind velocity, the stomata...", we need to analyze how stomata respond to environmental conditions, particularly high wind velocity. Here’s a step-by-step breakdown of the reasoning:

### Step 1: Understand the function of stomata
Stomata are small openings on the surface of leaves that allow for gas exchange. They are surrounded by guard cells that regulate their opening and closing. When stomata are open, they allow carbon dioxide to enter for photosynthesis and water vapor to exit, which is known as transpiration.

**Hint:** Remember that stomata play a crucial role in gas exchange and transpiration in plants.

### Step 2: Identify factors affecting stomatal behavior
Several environmental factors influence the opening and closing of stomata, including light, temperature, humidity, and wind. High wind velocity can increase the rate of transpiration due to the movement of air, which can lead to water loss.

**Hint:** Think about how wind might affect water loss and stomatal behavior.

### Step 3: Analyze the effect of high wind velocity
During high wind conditions, the rate of transpiration can increase significantly. To prevent excessive water loss, plants often respond by closing their stomata. This helps to conserve water, especially in conditions where it may be difficult to absorb enough water from the soil.

**Hint:** Consider the plant's need to balance water loss with gas exchange.

### Step 4: Evaluate the options given in the question
The options provided are:
1. Open more widely
2. Close down
3. Remain unaffected
4. Remain unaffected but lose more water due to mass action

Based on the analysis, the most logical response of stomata during high wind velocity is to close down to reduce water loss.

**Hint:** Look for the option that aligns with the plant's strategy to conserve water during stressful conditions.

### Conclusion
The correct answer is that during high wind velocity, the stomata **close down** to minimize water loss.

**Final Answer:** The stomata close down.