Some strains of Bacillus thuringiensis produce toxic proteins that do not kill:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Crustaceans
Crustaceans are not insects and are not among the groups NCERT names.
Option (1) Lepidopterans — Killed by Bt toxins.
Option (2) Coleopterans — Killed by Bt toxins.
Option (3) Crustaceans — Not killed by Bt toxins. Crabs, prawns and their relatives are not among the groups NCERT names.
Option (4) Dipterans — Killed by Bt toxins.
Note: The same question was also asked in CUET (UG) 2025 on 20-05-2025 (Slot 1), and a similar question in CUET (UG) 2025 on 14-05-2025 (Slot 1).
NCERT Extract:
Biotechnological Applications in Agriculture – “… Bt Cotton: Some strains of Bacillus thuringiensis produce proteins that kill certain insects such as lepidopterans (tobacco budworm, armyworm), coleopterans (beetles) and dipterans (flies, mosquitoes). B. thuringiensis forms protein crystals during a particular phase of their growth. These crystals contain a toxic insecticidal protein.”