Select an incorrect statement

Options

A. Auxin promotes xylem differentiation
B. NAA is used to overcome and apical dominance
C. Auxin help to prevent fruit and leaf drop at early stages
D. Auxin prevent lodging of cereals

Answer

To solve the question of selecting an incorrect statement regarding auxin, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Role of Auxin**: Auxin is a plant hormone that plays a crucial role in the growth and development of plants. It is primarily found at the tips of shoots and is responsible for various growth processes.

2. **Identify Functions of Auxin**:
- Promotes cell division in meristematic tissue.
- Involved in xylem differentiation, which is essential for water and nutrient conduction.
- Influences apical dominance, where the main shoot grows more vigorously than the lateral shoots.

3. **Analyze the Statements**:
- **Statement 1**: Auxin is found at the tip of the shoot and promotes growth. (Correct)
- **Statement 2**: NAA (naphthalene acetic acid) is used to overcome apical dominance. (Incorrect)
- **Statement 3**: 2,4-D is used as a weedicide in agriculture. (Correct)
- **Statement 4**: Auxin prevents lodging in cereals. (Correct)
- **Statement 5**: Auxin helps prevent early fruit and leaf drop. (Correct)

4. **Identify the Incorrect Statement**:
- The second statement is incorrect because NAA, a synthetic auxin, actually promotes apical dominance rather than overcoming it.

5. **Conclusion**: The incorrect statement is option 2, which claims that NAA is used to overcome apical dominance.