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Bt cotton variety that was developed by the introduction of toxin gene of Bacillus thuringiensis (Bt) is resistant to:
Bt cotton expresses Cry endotoxins (cryIAc, cryIIAb) that kill insect pests like cotton bollworms by creating pores in their midgut epithelial cells. Nematode resistance in tobacco is mediated by RNAi. Mark Insect pests (Option 1) in 5 seconds!
Bacillus thuringiensis is a soil bacterium that forms intracellular crystalline protein endotoxins (Bt toxins) encoded by cry genes during sporulation.
Bt toxins have insecticidal activity specific to insect pests belonging to Lepidoptera (cotton bollworms, armyworms), Coleopterans (beetles), and Dipterans (flies, mosquitoes).
Insect pests are herbivorous insects that damage and feed on the cotton bolls. Insect predators are natural beneficial enemies of pests. Bt cotton specifically targets the herbivorous insect pests that ingest the cotton plant tissue.
Resistance to root-knot nematodes (Meloidogyne incognita in tobacco) is achieved through RNA interference (RNAi), not Bt endotoxin genes.
Diagnose every choice: Know exactly why the right option works and why distractors fail.
Factually exact; Bt cotton was specifically created to provide resistance against insect pests like cotton bollworms.
Incorrect; Bt endotoxins are insecticidal crystal proteins with no activity against fungal plant pathogens.
Incorrect; nematode resistance is accomplished through RNA interference (RNAi) technology, not Bt cotton cry genes.
Incorrect; insect predators are beneficial biocontrol agents; Bt crops are designed to kill feeding herbivorous insect pests.
Bt cotton controls INSECT PESTS (bollworms). RNAi in tobacco controls ROOT-KNOT NEMATODES (Meloidogyne incognita).
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