A resistance type where various cultivars of a crop infested with different insect biotypes of the same species display no differential interaction is designated ___________________?
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Answer: B. Horizontal resistance
Explanation
Horizontal resistance operates uniformly against various strains without differential interactions. Different crop cultivars show consistent relative performance when infested by diverse biotypes. This form of resistance provides stable protection across a wide range of pest populations. Polygenic inheritance typically controls horizontal resistance, making it durable over time. Plant pathologists contrast this stable defense with race-specific vertical resistance systems. Breeding programs prioritize horizontal resistance to protect crops from evolving pathogens.
Sustainable crop production relies heavily on horizontal resistance to minimize epidemic risks. Agricultural scientists evaluate cultivar trials across multiple regions to confirm stability. Farmers benefit from predictable crop performance when utilizing horizontally resistant seeds. Specific resistance exhibits strong differential interactions with particular pathogen races. General resistance is a broader synonym, but horizontal is the precise technical term here. Cross resistance refers to chemical pesticide tolerances rather than host plant defenses.
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- Agriculture
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- Agriculture
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