Find the incorrect one:

Options

A. Plants obtain their inoriganic nutrients from air and soil
B. An initial uptake of ions in free space is slow
C. `NH_(3)` is the first stable product of `N_(2)` fixation process
D. Division and growth of cortical and pericycle cells lead to nodule formation in legumes

Answer

To solve the question of identifying the incorrect statement regarding mineral nutrition in plants, we will analyze each of the provided options step by step.

### Step-by-Step Solution:

1. **Analyze Option 1**:
- The statement claims that "plants obtain their inorganic nutrients from air and soil."
- **Evaluation**: This statement is correct. Plants do absorb inorganic nutrients like nitrogen, phosphorus, and potassium from the soil, and nitrogen can also be obtained from the air through nitrogen-fixing bacteria.

2. **Analyze Option 2**:
- The statement claims that "an initial uptake of ions in free space is slow."
- **Evaluation**: This statement is incorrect. When ions are present in the free space, their uptake by plants is rapid, not slow. Therefore, this is the incorrect option.

3. **Analyze Option 3**:
- The statement claims that "NH3 (Ammonia) is the first stable product of the nitrogen fixation process."
- **Evaluation**: This statement is correct. During nitrogen fixation, ammonia (NH3) is indeed the first stable product formed.

4. **Analyze Option 4**:
- The statement claims that "division and growth of cortical and pericycle cells lead to nodule formation in legumes."
- **Evaluation**: This statement is also correct. In legumes, the growth and division of these cells are essential for the formation of root nodules, which house nitrogen-fixing bacteria.

### Conclusion:
The only incorrect statement among the options provided is **Option 2**.