Root shows negative geotropic in

Options

A. Pothos
B. Ficus
C. Acanthorhiza
D. Sonneratia

Answer

To solve the question "Root shows negative geotropic in," we need to understand the concept of negative geotropism and identify which plant from the given options exhibits this characteristic.

### Step-by-Step Solution:

1. **Understand Negative Geotropism**:
- Negative geotropism refers to the growth of plant parts in the opposite direction to the gravitational pull. In the case of roots, this means they grow upwards or away from the gravitational force.

2. **Analyze the Options**:
- The options provided are:
1. Prothos
2. Phycus
3. Acanthorhiza
4. Sonaratia

3. **Identify the Characteristics of Each Option**:
- **Prothos**: This is not commonly known for exhibiting negative geotropism.
- **Phycus**: Typically, roots of this plant grow downwards, showing positive geotropism.
- **Acanthorhiza**: This plant does not have a known association with negative geotropism.
- **Sonaratia**: This is a mangrove plant known for its specialized roots called "pneumatophores," which grow upwards away from the soil, exhibiting negative geotropism.

4. **Conclusion**:
- Among the options, Sonaratia is the only plant that shows negative geotropism due to its modified roots (pneumatophores) that grow upwards for gas exchange in a saline environment.

5. **Final Answer**:
- The correct answer is **Sonaratia** (Option 4).