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What does impregnation refer to in pesticides?
Adding aroma to pesticides
Creating pesticide-resistant materials
Incorporating pesticide active ingredient into a solid material
Improving the taste of pesticides
The correct answer is: Incorporating pesticide active ingredient into a solid material
Impregnation refers to incorporating the pesticide active ingredient into a solid material, typically through a liquid or gas process. This allows for the pesticide to be released slowly and consistently, increasing its effectiveness and reducing the need for frequent re-application. Option A is incorrect because adding aroma to pesticides would not affect their efficacy. Option B is incorrect because creating pesticide-resistant materials is not directly related to the use of pesticides. Option D is incorrect because improving the taste of pesticides is not necessary or relevant to their function.