Strains of Bacillus thuringiensis (Bt) are used in producing

Options

A. Bioinsecticidal plants
B. Biomineralisation
C. Biometallurgical techniques
D. Biofertilizers

Answer

**Step-by-Step Solution:**

1. **Identify the Organism**: The question refers to strains of *Bacillus thuringiensis* (Bt). This is a bacterium known for its insecticidal properties.

2. **Understand the Function of Bt**: The primary function of *Bacillus thuringiensis* is to produce toxins that are harmful to certain insects. These toxins are known as Bt toxins.

3. **Mechanism of Action**: The toxins produced by *Bacillus thuringiensis* have the ability to kill insects that feed on plants. When ingested, these toxins disrupt the digestive system of the insects, leading to their death.

4. **Application in Agriculture**: The genes responsible for producing these toxins can be isolated and incorporated into the DNA of various crops through recombinant DNA technology (RDT). This process transforms the crops into genetically modified organisms (GMOs).

5. **Resulting Product**: The genetically modified crops that express the Bt toxin are referred to as bio insecticidal crops. These crops are designed to be resistant to insect pests, thereby reducing the need for chemical insecticides.

6. **Conclusion**: Therefore, strains of *Bacillus thuringiensis* are primarily used in producing bio insecticidal plants.

**Final Answer**: Strains of *Bacillus thuringiensis* (Bt) are used in producing bio insecticidal plants.

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