Enzyme connected with opening and closing of stomata is

Options

A. `alpha`-amylase
B. Pyruvic kinase
C. PEP carboxylase
D. RuDP carboxylase

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the enzyme that is connected with the opening and closing of stomata in plants.

2. **Analyzing the Options**: Four options are given:
- A) Alpha amylase
- B) Pyruvic kinase
- C) PEP carboxylase
- D) RuBP carboxylase

3. **Evaluating Option A - Alpha Amylase**:
- Alpha amylase is an enzyme that hydrolyzes starch into sugars.
- It does not play a role in the regulation of stomata.
- **Conclusion**: Not the correct answer.

4. **Evaluating Option B - Pyruvic Kinase**:
- Pyruvic kinase is involved in the glycolysis pathway, facilitating the conversion of phosphoenolpyruvate to pyruvic acid.
- This process is not directly related to the opening and closing of stomata.
- **Conclusion**: Not the correct answer.

5. **Evaluating Option C - PEP Carboxylase**:
- PEP carboxylase is crucial in the process of photosynthesis, particularly in C4 plants.
- It catalyzes the conversion of phosphoenolpyruvate (PEP) to oxaloacetate, which is then converted to malate.
- Malate plays a significant role in the regulation of stomatal movement, helping to open and close the stomata.
- **Conclusion**: This is the correct answer.

6. **Evaluating Option D - RuBP Carboxylase**:
- RuBP carboxylase (also known as Rubisco) is involved in the fixation of carbon dioxide during the Calvin cycle.
- While it is important for photosynthesis, it does not directly regulate stomatal movement.
- **Conclusion**: Not the correct answer.

7. **Final Answer**: The enzyme connected with the opening and closing of stomata is **C) PEP carboxylase**.