Herbicide Resistance
Evolution of weed resistance to herbicides through repeated application of same chemical, requiring new weed management strategies.
Real World
Palmer amaranth, a superweed resistant to glyphosate (Roundup), now infests over 10 million hectares of US farmland, costing farmers billions in lost yield and forcing a return to soil-damaging tillage.
Exam Focus
Link herbicide resistance explicitly to natural selection — examiners expect evolutionary mechanism, not just 'the plant became resistant'.
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