Texas Pesticide Applicator Practice Exam

What is one way that some weeds can harm other organisms?

1. Creating shelter for beneficial insects

2. Causing hay fever in people

3. Improving soil quality

4. Increasing crop yields

The correct answer is: Causing hay fever in people

Weeds can pose a threat to other organisms through their role in triggering allergic reactions, such as hay fever, in humans. Some common weeds release pollen during their reproductive cycles, which can lead to respiratory issues and other health problems for sensitive individuals. This impacts not only personal well-being but also public health, as higher concentrations of allergenic pollen can affect community comfort and productivity. The other options present non-harmful or beneficial characteristics of weeds. For instance, creating shelter for beneficial insects and improving soil quality suggest positive contributions to the ecosystem. Additionally, increasing crop yields implies that weeds may support agricultural productivity, which does not align with the notion of causing harm. Therefore, the presence of certain weeds can indeed have negative consequences for human health through allergic reactions.