"Roots are positively gootropic." The exception to this statement is

Options

A. pneumatophores in Rhizophora
B. stilt roots in sugarcane
C. prop roots in banyan
D. nodulated roots in legumes

Answer

### Step-by-Step Solution:

1. **Understanding Geotropism**:
- Roots are generally known to exhibit positive geotropism, meaning they grow downwards in response to gravity. This is a common characteristic of most plant roots.

2. **Identifying Exceptions**:
- The question asks for an exception to the statement that roots are positively geotropic. We need to identify any specific type of root that does not follow this behavior.

3. **Exploring Pneumatophores**:
- Pneumatophores are specialized roots found in certain plants, particularly halophytes like Rhizophora. These roots grow vertically upwards instead of downwards.

4. **Function of Pneumatophores**:
- The primary function of pneumatophores is to facilitate respiration. They allow the plant to exchange gases, particularly oxygen, which is crucial for survival in waterlogged, saline environments.

5. **Examples of Plants with Pneumatophores**:
- Rhizophora, commonly known as mangroves, is a well-known example of a plant that has pneumatophores. These roots emerge above the ground to help the plant survive in swampy areas.

6. **Conclusion**:
- Therefore, the exception to the statement "Roots are positively geotropic" is the pneumatophores found in Rhizophora.

### Final Answer:
The exception to the statement "Roots are positively geotropic" is **Pneumatophores in Rhizophora**.

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