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In mung bean, resistance to yellow mosaic virus and powdery mildew were brought about by:

1. Hybridisation and selection
2. Mutation breeding
3. Biofortification
4. Tissue culture

Correct answer: Mutation breeding

Solution

Resistance to yellow mosaic virus and powdery mildew in mung bean was achieved through mutation breeding, which involves inducing mutations to develop desirable traits like disease resistance.

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