A Farmer Uses Triazine Herbicide to Control Pigweed in His

question 6

Multiple Choice

A farmer uses triazine herbicide to control pigweed in his field.For the first few years,the triazine works well and almost all the pigweed dies;but after several years,the farmer sees more and more pigweed.Which of these explanations best describes this observation?

• A)The herbicide company lost its triazine formula and started selling poor-quality triazine.
• B)Natural selection caused the pigweed to mutate,creating a new triazine-resistant species.
• C)Triazine-resistant pigweed has less-efficient photosynthesis metabolism.
• D)Only triazine-resistant weeds survived and reproduced,so each year more pigweed was triazine-resistant.

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Definitions:

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