Question:
Protein encoded by gene Cry-I Ab controls the infestation of which of the following ?
Protein encoded by gene Cry-I Ab controls the infestation of which of the following ?
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In NCERT, cryIAb is the gene against corn borer, while cryIAc and cryIIAb act on cotton bollworms.
Updated On: Oct 22, 2026
- Cotton bollworms
- Mosquitoes
- Corn borer
- Agrobacterium
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Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Recall the Bt toxin genes:
Bacillus thuringiensis makes Cry proteins, each toxic to a group of insects.
The gene names tell which insect is killed.
Step 2: Match the gene:
The genes cryIAc and cryIIAb control cotton bollworms.
The gene cryIAb controls the corn borer.
Step 3: Check the wrong options:
Cotton bollworms are controlled by cryIAc and cryIIAb, not cryIAb.
Mosquitoes are controlled by other Bt toxin types, not by this gene in NCERT.
Agrobacterium is a bacterium used as a vector, so Cry toxin is not aimed at it.
Final Answer:
Cry-I Ab protein controls the corn borer, option (C). \[ \boxed{\text{Corn borer}} \]
Bacillus thuringiensis makes Cry proteins, each toxic to a group of insects.
The gene names tell which insect is killed.
Step 2: Match the gene:
The genes cryIAc and cryIIAb control cotton bollworms.
The gene cryIAb controls the corn borer.
Step 3: Check the wrong options:
Cotton bollworms are controlled by cryIAc and cryIIAb, not cryIAb.
Mosquitoes are controlled by other Bt toxin types, not by this gene in NCERT.
Agrobacterium is a bacterium used as a vector, so Cry toxin is not aimed at it.
Final Answer:
Cry-I Ab protein controls the corn borer, option (C). \[ \boxed{\text{Corn borer}} \]
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