Which one is a false statement?

Options

A. The 10 and `2^(@)` phloem get gradually crushed due to the continued formation and accumulation of `2^(@)` xylem
B. `1^(@)`xylem remains more or less intact in or near the centre
C. Secondary growth is increase in length of the axis
D. None

Answer

To determine which statement is false, we will analyze each option provided:

1. **Option 1**: "The 10th and 2nd phloem get gradually crushed due to the continuous formation and accumulation of 2nd xylem."
- **Analysis**: This statement is true. In plants, as secondary xylem (wood) is produced, it pushes the older phloem layers outward, leading to their eventual crushing. The accumulation of secondary xylem indeed affects the phloem.

2. **Option 2**: "Primary xylem remains more or less intact in or near the center."
- **Analysis**: This statement is also true. The primary xylem, which is formed during the initial stages of growth, is located at the center of the plant and generally remains intact as secondary growth occurs around it.

3. **Option 3**: "Secondary growth is increased in length of the axis."
- **Analysis**: This statement is false. Secondary growth primarily increases the thickness (or girth) of the plant, not its length. Lengthwise growth is mainly due to primary growth, which occurs at the tips of roots and shoots.

Based on the analysis, the false statement is **Option 3**.

### Step-by-Step Solution:
1. **Identify the statements**: Read through each option carefully.
2. **Analyze Option 1**: Confirm that it is true regarding the crushing of phloem due to secondary xylem accumulation.
3. **Analyze Option 2**: Verify that primary xylem remains intact in the center of the plant.
4. **Analyze Option 3**: Recognize that secondary growth increases thickness, not length.
5. **Determine the false statement**: Conclude that Option 3 is the false statement.