What happens if you catch grass in areas treated with chemicals?

The choice indicating that catching grass in areas treated with chemicals contributes to the effectiveness of the chemical barrier is correct because maintaining healthy vegetation can enhance the overall effectiveness of pesticide applications. When grass or other vegetation is present, it can help create a more stable microenvironment that supports the chemicals in adhering to surfaces longer and reduces the likelihood of evaporation or runoff that diminishes their effectiveness. Additionally, healthy grass can absorb and utilize the chemicals more efficiently, making better use of the pesticides applied.

This context emphasizes the importance of proper vegetation management in treated areas, as it can maximize pesticide efficacy and ensure that the intended control measures for pests remain in place.