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Q.

Bt cotton variety that was developed by the introduction of toxin gene of Bacillus thuringiensis (Bt) is resistant to :

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a

Fungal diseases

b

Plant nematodes

c

Insect predators

d

Insect pests

answer is D.

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Detailed Solution

Bt cotton is a transgenic cotton plant that contains gene for synthesis of a crystal protein that is toxic to insects. Some strains of Bacillus thuringiensis produce proteins that kill certain insects such as lepidopterans (tobacco budworm, armyworm), coleopterans (beetles) and dipterans (flies, mosquitoes).A nematode Meloidegyne incognitia infects the roots of tobacco plants and causes a great reduction in yield. A novel strategy was adopted to prevent this infestation which was based on the process of RNA interference (RNAi).
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