Question:
Bacillus thuringiensis is used to control which one of the following pathogens/pests ?
Bacillus thuringiensis is used to control which one of the following pathogens/pests ?
Show Hint
Bt toxin from Bacillus thuringiensis kills insect larvae, so it is a biocontrol agent for insect pests.
Updated On: Oct 22, 2026
- Bacterial pathogen
- Fungal pathogen
- Nematodes
- Insect pests
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Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Recall what Bt is:
Bacillus thuringiensis (Bt) is a soil bacterium.
It is used as a biocontrol agent, a living organism used to control pests.
Step 2: Know how it works:
Dried spores of Bt are sprayed on crops such as brassicas and fruit trees.
A caterpillar eats the leaf and the toxin becomes active in its alkaline gut.
The toxin kills the larva, so the pest is controlled.
Step 3: Name the targets:
Bt toxin acts on the larvae of lepidopteran, coleopteran and dipteran insects.
So it controls insect pests.
Step 4: Check the other options:
Bt toxin is not used against bacterial or fungal pathogens.
Nematodes are not the target of the Cry proteins.
So only option (D) fits.
Final Answer:
Bt is used to control insect pests, option (D).
Bacillus thuringiensis (Bt) is a soil bacterium.
It is used as a biocontrol agent, a living organism used to control pests.
Step 2: Know how it works:
Dried spores of Bt are sprayed on crops such as brassicas and fruit trees.
A caterpillar eats the leaf and the toxin becomes active in its alkaline gut.
The toxin kills the larva, so the pest is controlled.
Step 3: Name the targets:
Bt toxin acts on the larvae of lepidopteran, coleopteran and dipteran insects.
So it controls insect pests.
Step 4: Check the other options:
Bt toxin is not used against bacterial or fungal pathogens.
Nematodes are not the target of the Cry proteins.
So only option (D) fits.
Final Answer:
Bt is used to control insect pests, option (D).
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