Higher levels of pesticide may be less effective. The pesticides may break down quickly. Water supplies can be contaminated by pesticide runoff. The pesticide will increase the plant production.
I gave my students this multiple choice question: When using more than the recommended amounts of pesticide on farmland, yards, and gardens, what is most likely to occur?

Only one answer is correct among these 4 choices:
- Higher levels of pesticide may be less effective.
- The pesticides may break down quickly.
- Water supplies can be contaminated by pesticide runoff.
- The pesticide will increase the plant production.

Could you tell me which one is correct?

Water supplies can be contaminated by pesticide runoff.