Which of the following theory gives the latest explanation for the opening and closing of stomata?

Options

A. ABA theory
B. Munch theory
C. Starch glucose theory
D. Active `K^(+)` transport theory

Answer

### Step-by-Step Text Solution:

1. **Identify the Question**: The question asks for the latest theory that explains the opening and closing of stomata in plants.

2. **List the Options**: The options provided are:
- A) ABA theory
- B) Munch theory
- C) Starch and glucose theory
- D) Active K plus transport theory

3. **Evaluate Each Option**:
- **A) ABA Theory**: Abscisic acid (ABA) is known to play a role in the closure of stomata, particularly during water stress. However, it does not provide a comprehensive explanation for the opening of stomata.
- **B) Munch Theory**: This theory is related to the translocation of organic solutes and does not pertain to the opening and closing of stomata.
- **C) Starch and Glucose Theory**: There is no recognized theory specifically named "starch and glucose theory" that explains stomatal movement.
- **D) Active K plus Transport Theory**: This theory explains that the influx of potassium ions (K+) into guard cells leads to the opening of stomata. It involves the efflux of hydrogen ions (H+) and a decrease in CO2 levels, which are conditions that promote stomatal opening.

4. **Select the Correct Answer**: Based on the evaluation, the most accurate and latest explanation for the opening and closing of stomata is the **Active K plus Transport Theory** (Option D).

5. **Conclusion**: The correct answer is **D) Active K plus transport theory**.