Find the odd one out:

Options

A. Lianas in tropical rain forest
B. E. coli in large intestine of man
C. Pilot fish remora and shark
D. Rafflesia on the roots of a forest tree

Answer

To solve the question "Find the odd one out," we need to analyze the options provided:

1. **Option A: Lianas in tropical rainforest**
- Lianas are climbing plants that are rooted in the soil but use trees to reach sunlight. They are a common feature of tropical rainforests.

2. **Option B: E. coli in large intestine of man**
- E. coli is a type of bacteria that resides in the intestines of humans and is part of the gut microbiome.

3. **Option C: Pallid fish remora and shark**
- Remoras are fish that attach themselves to larger marine animals, such as sharks, to benefit from their movement and feeding.

4. **Option D: Rafflesia on the root of forest tree**
- Rafflesia is a genus of parasitic flowering plants that grows on the roots of certain trees. It is known for having the largest flowers in the world.

Now, let's identify the odd one out:

- **Lianas**, **E. coli**, and **remoras** all have a mutualistic or commensal relationship with other organisms or their environment.
- **Rafflesia**, on the other hand, is a **parasitic plant** that relies on its host for nutrients and does not provide any benefit to the host.

Thus, the odd one out is **Option D: Rafflesia on the root of forest tree**.

### Step-by-Step Solution:
1. **Identify the characteristics of each option**: Analyze the nature of each organism and its relationship with its environment.
2. **Categorize the relationships**: Determine if the organisms have mutualistic, commensal, or parasitic relationships.
3. **Compare and contrast**: Look for the one that does not fit the pattern established by the others.
4. **Conclude**: Identify the odd one out based on the analysis.