A Farmer Uses Triazine Herbicide to Control Pigweed in His

question 20

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 statements explains why the pigweed reappeared?

• 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) Triazine-resistant weeds were more likely to survive and reproduce.

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