Which one is wrong in relation to transgenic Bt cotton plant

Options

A. Crop yield loss due to attack by Bacillus thuringiensis bacterium is reduced
B. Crop yield loss due to attack by lepidopteran insect pest is reduced
C. Use of chemical insecticides in the cotton field is minimised
D. Better quality cotton is produced

Answer

### Step-by-Step Solution:

1. **Understanding Transgenic Bt Cotton**: Transgenic Bt cotton is genetically modified to express a toxin from the bacterium *Bacillus thuringiensis* (Bt). This toxin is effective against certain insect pests, particularly those belonging to the Lepidoptera order, which includes many common agricultural pests.

2. **Analyzing the Statements**:
- **Statement 1**: "Crop yield loss due to attack of the *Bacillus thuringiensis* bacterium is reduced."
- This statement is incorrect because *Bacillus thuringiensis* does not attack cotton plants; rather, it is the source of the toxin that protects the plants from insect pests.

- **Statement 2**: "Crop yield loss due to attack of the Lepidopteran insect pest is reduced."
- This statement is correct. The Bt toxin specifically targets Lepidopteran pests, thus reducing crop yield loss due to their attacks.

- **Statement 3**: "Use of chemical insecticides in the cotton field is minimized."
- This statement is also correct. With the introduction of Bt cotton, the need for chemical insecticides is reduced since the plant itself can resist certain pests.

- **Statement 4**: "Better quality cotton is produced."
- This statement is correct as well. With reduced pest damage, the quality of the cotton produced is generally better.

3. **Identifying the Incorrect Statement**:
- The only incorrect statement in relation to transgenic Bt cotton is the first one, which suggests that crop yield loss due to attack by *Bacillus thuringiensis* is reduced. This is wrong because *Bacillus thuringiensis* does not attack the cotton plants; it is the pest that is being targeted.

### Conclusion:
The wrong statement in relation to transgenic Bt cotton is: "Crop yield loss due to attack of the *Bacillus thuringiensis* bacterium is reduced."

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