Which of the following statements is not true about stomata

Options

A. As guard cells become turgid, the stomata open
B. There are two guard cells around each stoma
C. Guard cells take up potassium ions and water enters the guarc cells
D. Guard cells surrounding stomata lack chloroplasts that other epidermal cells contain

Answer

To determine which statement is not true about stomata, we will analyze each statement provided in the question.

### Step-by-Step Solution:

1. **Understanding Stomata**:
- Stomata are tiny pores located on the epidermis of leaves and stems. They play a crucial role in gas exchange and transpiration in plants.

2. **Analyzing Statement A**:
- "As guard cells become turgid, the stomata open."
- This statement is true. When guard cells take up water and become turgid (swollen), they cause the stomata to open.

3. **Analyzing Statement B**:
- "There are two guard cells around each stomata."
- This statement is also true. Each stoma is surrounded by a pair of guard cells.

4. **Analyzing Statement C**:
- "Guard cells take up potassium ions and water enters the guard cells."
- This statement is true as well. The uptake of potassium ions by guard cells leads to water entering the cells, causing them to swell and the stomata to open.

5. **Analyzing Statement D**:
- "Guard cells surrounding stomata lack chloroplasts that other epidermal cells contain."
- This statement is not true. Guard cells do contain chloroplasts, unlike some other epidermal cells which may not have them.

6. **Conclusion**:
- The statement that is not true about stomata is Statement D.

### Final Answer:
The statement that is not true about stomata is: "Guard cells surrounding stomata lack chloroplasts that other epidermal cells contain."

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