Select incorrect statement w.r.t. translocation of mineral ions.

Options

A. The chief sinks for the mineral elements are the apical and lateral meristems.
B. Most readily mobilised element are N,P,K
C. Most of the nitrogen travels as inorganic ions through xylem.
D. Small amount of P and S are carried as organic compound through xylem.

Answer

To solve the question of selecting the incorrect statement with respect to the translocation of mineral ions, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Translocation**: Translocation refers to the movement of mineral ions within a plant, primarily through the vascular tissues known as xylem and phloem. Xylem is responsible for transporting water and minerals, while phloem transports food.

2. **Identify the Statements**: We need to analyze the statements provided regarding the translocation of mineral ions. The statements typically include information about where minerals are found, how they are transported, and the forms in which they exist.

3. **Evaluate Each Statement**:
- **Statement 1**: "The chief sinks for the mineral elements are the apical and lateral meristem."
- This statement is correct as these regions require minerals for growth and development.
- **Statement 2**: "Most readily mobilized elements are nitrogen, phosphorus, potassium."
- This statement is also correct since these elements are essential and can be easily moved within the plant.
- **Statement 3**: "Most of the nitrogen travels as inorganic ions through the xylem."
- This statement is incorrect. Nitrogen primarily travels in the form of organic ions (nitrate and ammonium) rather than inorganic ions.
- **Statement 4**: "Small amounts of potassium, sulfur, and phosphorus are carried as organic compounds through the xylem."
- This statement is correct as these elements are often found in smaller amounts and can be transported as organic compounds.

4. **Select the Incorrect Statement**: Based on the evaluation, the incorrect statement is: "Most of the nitrogen travels as inorganic ions through the xylem."

### Final Answer:
The incorrect statement with respect to the translocation of mineral ions is: **"Most of the nitrogen travels as inorganic ions through the xylem."**

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