Auxetic growth is characterised by

Options

A. Increase in cell volume only
B. Increase in cell number only
C. Increase in fatty tissue
D. Increase in intercelluar material.

Answer

### Step-by-Step Solution:

1. **Understanding Auxetic Growth**: Auxetic growth refers to a specific type of growth characterized by an increase in cell volume. This means that the size of individual cells increases rather than the number of cells.

2. **Differentiating Growth Types**: It's important to differentiate auxetic growth from other types of growth:
- **Multiplicative Growth**: This type involves an increase in the number of cells.
- **Accretionary Growth**: This type is characterized by the accumulation of intercellular material.
- **Appositional Growth**: This type involves the increase in rigid material or bone mass.

3. **Analyzing the Options**: The question provides four options regarding what auxetic growth is characterized by:
- A) Increase in cell volume only
- B) Increase in cell number only
- C) Increase in fatty tissue
- D) Increase in intercellular material

4. **Identifying the Correct Option**:
- Option A states "increase in cell volume only," which aligns with the definition of auxetic growth.
- Option B refers to multiplicative growth, which is incorrect.
- Option C mentions fatty tissue, which is not relevant to auxetic growth.
- Option D refers to accretionary growth, which is also incorrect.

5. **Conclusion**: Therefore, the correct answer to the question is Option A: "increase in cell volume only."