Which one of the following pair is incorrectly matched ?

Options

A. Rhizobium - Root nodules of leguminous plants
B. Baculovirus - Nucleopolyhedro virus
C. Ladybird Beetles - aphids
D. Trichoderma - non - biocontrol agent

Answer

To solve the question "Which one of the following pair is incorrectly matched?" we will analyze each option provided:

### Step 1: Analyze Option 1
- **Pair**: Rhizobium and root nodules of leguminous plants.
- **Explanation**: Rhizobium is a nitrogen-fixing bacterium that forms symbiotic relationships with leguminous plants, leading to the formation of root nodules where nitrogen fixation occurs.
- **Conclusion**: This pair is correctly matched.

### Step 2: Analyze Option 2
- **Pair**: Vacuolovirus and nucleopolyhedral virus.
- **Explanation**: Vacuolovirus is indeed a type of virus that affects insects, particularly moths and butterflies. It is often referred to as nucleopolyhedrosis virus due to its characteristic polyhedral shape.
- **Conclusion**: This pair is correctly matched.

### Step 3: Analyze Option 3
- **Pair**: Ladybird beetles and F-weights.
- **Explanation**: Ladybird beetles are known to feed on aphids and other pests. The term "F-weights" seems to be a misinterpretation or incorrect terminology as it does not directly relate to ladybird beetles in a biological context.
- **Conclusion**: This pair is incorrectly matched.

### Step 4: Analyze Option 4
- **Pair**: Trichoderma and non-biocontrol agent.
- **Explanation**: Trichoderma is a genus of fungi that is widely used as a biocontrol agent and bio-fertilizer. It helps in promoting plant growth and increasing soil fertility.
- **Conclusion**: This pair is incorrectly matched.

### Final Conclusion
After analyzing all the options, we find that:
- The incorrectly matched pair is **Option 4: Trichoderma and non-biocontrol agent**.