which one of the following is used as biological insecticide ?

Options

A. Tiger beetle
B. Caterpillar
C. Silkmoth
D. Mazra poka

Answer

To determine which of the following options is used as a biological insecticide, we need to analyze each option provided:

1. **Tiger Beetle**: This is a predatory insect known for its ability to feed on other insects, including harmful pests. Tiger beetles are effective in controlling pest populations, making them a suitable candidate for biological insecticides.

2. **Caterpillar**: This is the larval stage of insects like butterflies. While caterpillars can be pests themselves, they are not used as biological insecticides since they do not feed on harmful insects.

3. **Silk Moth**: This is an insect primarily known for producing silk. Silk moths do not serve as biological insecticides, as they do not prey on other insects.

4. **Mazarapoca**: This seems to refer to a type of insect, but without specific details, it does not have a known role as a biological insecticide.

Based on the analysis, the correct answer is **Tiger Beetle**, as it is the only option that acts as a biological insecticide by feeding on harmful insects.

### Step-by-Step Solution:
1. **Identify the Options**: The options provided are Tiger Beetle, Caterpillar, Silk Moth, and Mazarapoca.
2. **Define Biological Insecticide**: Biological insecticides are living organisms that feed on harmful insects.
3. **Analyze Each Option**:
- **Tiger Beetle**: Predatory insect that feeds on pests.
- **Caterpillar**: Larval stage of insects, not a predator.
- **Silk Moth**: Known for silk production, not a predator.
- **Mazarapoca**: Not recognized as a biological insecticide.
4. **Select the Correct Answer**: The Tiger Beetle is the only option that fits the definition of a biological insecticide.