Which of the following is not an example of prey- predator relationship?

Options

A. Tigar eating a deer
B. Plant Nepenthes trapping an insect
C. Bacteria decomposing organic matter
D. Crocodile killing a man

Explanation

To determine which of the following options is not an example of a prey-predator relationship, we will analyze each option provided.

### Step-by-Step Solution:

1. **Understand the Prey-Predator Relationship**:
- A prey-predator relationship involves one organism (the predator) feeding on another organism (the prey). This relationship is crucial for energy transfer in an ecosystem.

2. **Evaluate the Options**:
- **Option A: Tiger eating a deer**: This is a classic example of a prey-predator relationship where the tiger (predator) hunts and eats the deer (prey).
- **Option B: Plant Nepenthes trapping an insect**: The Nepenthes plant, also known as the pitcher plant, traps insects for nutrients. Here, the plant acts as a predator, and the insect is the prey. This is also an example of predation.
- **Option C: Bacteria decomposing organic matter**: Bacteria break down dead and decaying organic matter. They do not kill living organisms for food; instead, they feed on already dead matter. Therefore, they are classified as decomposers, not predators.
- **Option D: Crocodile killing a man**: In this scenario, the crocodile is the predator, and the man is the prey. This is another example of a prey-predator relationship.

3. **Identify the Exception**:
- After evaluating all options, it is clear that option C (Bacteria decomposing organic matter) does not fit the prey-predator relationship because bacteria are decomposers, not predators.

4. **Conclusion**:
- The correct answer is **Option C**: Bacteria decomposing organic matter is not an example of a prey-predator relationship.