Question

The toxic substances released from Bacillus thuringiensis affect ........... of insect larva.

• A. brain
• B. gut
• C. Malpighian tubules
• D. trachea

Hint:

Bacillus thuringiensis produces toxins that specifically target the gut of insect larvae, leading to their death.

Answer 1

The Correct Option is B

Step 1: Understanding the action of Bacillus thuringiensis.
Bacillus thuringiensis (Bt) produces toxins that specifically target the gut of insect larvae. These toxins disrupt the digestive system, causing the larvae to stop feeding and eventually die.
Step 2: Analyzing the options.
(A) brain: Incorrect. The toxins from Bt affect the gut, not the brain of the larvae.
(B) gut: Correct. The Bt toxins primarily target the gut of insect larvae, disrupting their digestive processes.
(C) Malpighian tubules: Incorrect. Malpighian tubules are involved in excretion, but Bt toxins do not primarily affect these structures.
(D) trachea: Incorrect. The trachea is involved in respiration, but Bt toxins do not directly affect it.
Step 3: Conclusion.
The correct answer is (B) gut, as Bacillus thuringiensis toxins primarily affect the digestive system of insect larvae.