Which of the following is a wrong statement ?

Options

A. `Cl^- ` along with `K^+` maintain anion- cation balance in the cell.
B. Nitrogen is the essential element required by the plant in the greatest amount it is absorbed , mainly , in the form of `NO_2^- and NH_3 `
C. Sulphur is an important constituent of Coenzyme -A and cysteine.
D. Boron is important for uptake and utilization of `Ca^(++)`

Answer

To solve the question "Which of the following is a wrong statement?" we will analyze each of the provided statements one by one.

### Step-by-Step Solution:

1. **Analyze Statement 1:**
- The statement claims that chloride along with potassium ions maintains the anion-cation balance of the cell.
- This statement is correct. Chloride ions (Cl-) and potassium ions (K+) are essential for maintaining the ionic balance within cells.

**Hint:** Check if the ions mentioned are involved in maintaining cellular balance.

2. **Analyze Statement 2:**
- The statement claims that nitrogen is an essential element required by plants in the greatest amount, absorbed mainly in the form of NO2- and NH3.
- This statement is incorrect. Nitrogen is primarily absorbed in the form of nitrate ions (NO3-) and ammonium ions (NH4+), not as ammonia (NH3) or nitrite (NO2-). Plants cannot directly absorb ammonia; it must be protonated first.

**Hint:** Verify the forms in which nitrogen is absorbed by plants.

3. **Analyze Statement 3:**
- The statement claims that sulfur is an important constituent of coenzyme A and cysteine.
- This statement is correct. Sulfur is indeed a key component of certain amino acids (like cysteine and methionine) and coenzymes.

**Hint:** Recall the role of sulfur in amino acids and coenzymes.

4. **Analyze Statement 4:**
- The statement claims that boron is an important mineral associated with the uptake and utilization of calcium.
- This statement is correct. Boron plays a crucial role in various physiological processes, including calcium uptake and utilization.

**Hint:** Consider the role of boron in plant physiology.

### Conclusion:
After analyzing all the statements, we find that **Statement 2** is the only wrong statement. Therefore, the answer to the question is that the wrong statement is:

**Answer: Statement 2**