Which element are considered as balancing elements?

Options

A. Ca and K
B. C and H
C. N and S
D. Mg and Fe

Answer

### Step-by-Step Solution:

1. **Understanding the Classification of Elements**: Elements are classified based on their functions in plants into four categories: protoplasmic elements, balancing elements, framework elements, and catalytic elements.

2. **Defining Balancing Elements**: Balancing elements are mineral elements that help to mitigate the toxic or poisonous effects of other elements in plants. They play a crucial role in maintaining ionic balance within the cells.

3. **Identifying Examples of Balancing Elements**: The primary examples of balancing elements include:
- Calcium (Ca)
- Magnesium (Mg)
- Potassium (K)

4. **Conclusion**: Therefore, the elements that are considered as balancing elements are Calcium, Magnesium, and Potassium.