Which of the following statement is false?

Options

A. `Ca^(2+)` ions are not important in maintaining the regular beating of the heart.
B. `Mg^(2+)` ions are important in the green parts of the plants.
C. ` Mg^(2+)` ions form a complex with ATP.
D. `Ca^(2+)` ions are important in blood clotting.

Explanation

To determine which statement is false among the given options, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Examine Statement A**: "Ca²⁺ ions are important in blood clotting."
- **Analysis**: This statement is true. Calcium ions (Ca²⁺) play a crucial role in the blood clotting process. They are essential for the activation of various clotting factors and are found in plasma, where their concentration is maintained by hormones like calcitonin and parathyroid hormone.

2. **Examine Statement B**: "Mg²⁺ is important in the green parts of plants."
- **Analysis**: This statement is also true. Magnesium ions (Mg²⁺) are a central component of chlorophyll, the molecule responsible for the green color in plants and essential for photosynthesis.

3. **Examine Statement C**: "Mg²⁺ forms complexes with ATP."
- **Analysis**: This statement is true as well. Magnesium ions (Mg²⁺) act as cofactors for many enzymes that utilize ATP, stabilizing the ATP molecule and facilitating its interaction with other substrates.

4. **Examine Statement D**: "Ca²⁺ ions are important to maintain heart beat regularly."
- **Analysis**: This statement is true. Calcium ions (Ca²⁺) are vital for muscle contraction, including the heart muscle, and play a significant role in maintaining a regular heartbeat.

5. **Identify the False Statement**: After analyzing all statements, we find that all statements A, B, C, and D are true. However, if we consider the context of the question and the provided video transcript, it seems there was confusion regarding the importance of Ca²⁺ ions. The statement that Ca²⁺ ions are "impotent" is incorrect, as they are indeed essential for various physiological functions, including blood clotting and heart function.

### Conclusion:
The false statement among the options is that "Ca²⁺ ions are impotent." This is incorrect because Ca²⁺ ions are crucial for maintaining heart rhythm and other bodily functions.