Question

which of these is an environmental consequence of pesticide runoff? faster breakdown of pesticides contamination of water sources enhanced pest resistance increased crop yields

Explanation:

• "Faster breakdown of pesticides" is incorrect as runoff doesn't speed up pesticide breakdown; it transports them.
• "Contamination of water sources" is correct because pesticide runoff (when rain or irrigation carries pesticides) flows into water bodies like rivers, lakes, or groundwater, polluting them.
• "Enhanced pest resistance" is a result of repeated pesticide use over time, not runoff.
• "Increased crop yields" is not a consequence of runoff; runoff can harm crops or not directly increase yields, and increased yields are more related to proper pesticide application for pest control, not runoff.

Answer:

B. contamination of water sources (assuming the options are labeled A, B, C, D with A: faster breakdown of pesticides, B: contamination of water sources, C: enhanced pest resistance, D: increased crop yields)