Identify the Bt toxin gene which controls the corn borer.

The correct answer is Option (3) → cryIAb

Bt toxin genes are named cry genes. Each gene makes a toxin that kills only one group of insects, so the gene is chosen according to the pest. The proteins made by cryIAc and cryIIAb control the cotton bollworms, and the protein made by cryIAb controls the corn borer.

(1) cryIAc — Incorrect. It is a gene against the cotton bollworms.

(2) cryIIAb — Incorrect. It also acts against the cotton bollworms.

(3) cryIAb — Correct. It controls the corn borer.

(4) cryIIAc — Incorrect. No such gene is named in NCERT.

Note: A similar question was also asked in CUET (UG) 2025 on 14-05-2025 (Slot 1), in CUET (UG) 2023 on 25-05-2023 (Slot 3), and in CUET (UG) 2022 on 20-08-2022 (Slot 1).

NCERT Extract:
Biotechnological Applications in Agriculture – …