Which of the following scientiste is credited with the mechanism of opening and closing of stomata related to `K^(+)` exchange?

Options

A. Levitt
B. Sayre
C. Scarth
D. Lloyd

Answer

To answer the question regarding which scientist is credited with the mechanism of opening and closing of stomata related to potassium ion (K⁺) exchange, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Function of Stomata**: Stomata are small openings on the surfaces of leaves that allow for gas exchange (CO₂ in and O₂ out) and transpiration (water vapor loss). The opening and closing of stomata are crucial for plant health and water regulation.

2. **Identify the Role of Potassium Ions (K⁺)**: The movement of potassium ions in and out of guard cells (the cells that surround stomata) is essential for the opening and closing mechanism. When K⁺ ions enter the guard cells, they cause the cells to swell and the stomata to open. Conversely, when K⁺ ions exit, the guard cells lose turgor pressure and the stomata close.

3. **Research the Scientists Involved**: The question lists several scientists: Leavitt, Seire, Sartre, and Lloyd. We need to determine which of these scientists is associated with the potassium ion mechanism in stomatal movement.

4. **Identify the Correct Scientist**: After reviewing the contributions of the listed scientists, it is recognized that Leavitt is the scientist credited with elucidating the mechanism of stomatal movement related to potassium ion exchange.

5. **Conclude the Answer**: Based on the information gathered, the correct answer to the question is Leavitt.

### Final Answer:
The scientist credited with the mechanism of opening and closing of stomata related to K⁺ exchange is **Leavitt**.

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