Bt brinijal an axample of transgenic crops. In this Bt refers to

Options

A. Bacillus tuberculosis
B. Bacillus thuringiensis
C. Biotechnology
D. `beta`-Carotene

Answer

**Step-by-Step Solution:**

1. **Understanding Transgenic Crops**: Transgenic crops are plants that have been genetically modified to contain a gene or genes from another species. This modification is often done to enhance certain traits, such as pest resistance or increased nutritional value.

2. **Identifying Bt in Bt Brinjal**: In the context of Bt brinjal, "Bt" refers to a specific bacterium. The options provided are:
- Bacillus tuberculosis
- Bacillus thuringiensis
- Biotechnology
- Beta carotene

3. **Correct Identification**: The correct answer is "Bacillus thuringiensis". This bacterium produces a toxin that is effective against certain pests.

4. **Mechanism of Action**: The gene from Bacillus thuringiensis that is inserted into the brinjal plant allows it to produce a protein (Bt toxin) that is toxic to specific insects. When these insects consume the plant, the alkaline conditions in their gut activate the toxin, leading to their death.

5. **Safety for Humans**: It is important to note that the Bt toxin is specifically harmful to the target pests and is not toxic to humans, making Bt brinjal a safe option for consumption.

6. **Conclusion**: Therefore, in the case of Bt brinjal, "Bt" stands for Bacillus thuringiensis, which is responsible for the pest-resistant trait of the crop.