Bt gene is got from

Options

A. Brassica napus
B. Bacillus thuringiensis
C. Azolla
D. Rhizobium

Answer

**Step-by-Step Solution:**

1. **Identify the Question:** The question asks where the Bt gene is obtained from.

2. **Review the Options:** The options provided are:
- Brassica Napis
- Bacillus Thuringiensis
- Azolla
- Rhizobium

3. **Recall Relevant Information:** The Bt gene is known for its role in producing a toxin that is effective against certain insect pests. This gene is commonly associated with genetically modified crops that are resistant to pests.

4. **Determine the Source of the Bt Gene:** The Bt gene is derived from a specific organism that produces this insecticidal toxin. The organism known for this is Bacillus Thuringiensis, a gram-positive soil bacterium.

5. **Explain the Function of the Bt Gene:** The Bt gene produces a protein known as Bt toxin (or Cry protein), which is toxic to certain insect larvae. When these larvae ingest the toxin, it becomes activated in their gut, leading to their death.

6. **Conclude with the Correct Answer:** Based on the information gathered, the correct answer to the question is Bacillus Thuringiensis.

**Final Answer:** The Bt gene is obtained from Bacillus Thuringiensis.

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