Question

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?

Answer 1

The question is incomplete and here is the full question:

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.

Answer:

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

Step-by-step explanation:

• Initially by killing non-resistant pigweed the farmer felt well by thinking all the pigweed have been died.
• The pigweed that is resistant to herbicide will survive and reproduce other would have beed died.
• Each year there would be more pigweed that is resistant to triazine herbicide.

Answer 2

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

Step-by-step explanation:

Generally, plants have the tendency of developing resistance to herbicide after some period of exposure to it. This can be linked to a predictable outcome of natural selection.

Note that, resistance of plant to herbicide can be explained as inherited ability to survive the effect of herbicide by plant.