Texas Pesticide Applicator Practice Exam

What are nematodes primarily known for in an ecological context?

1. Being pollinators

2. Causing structural damage to buildings

3. Being soil-dwelling pests

4. Helping plants grow

The correct answer is: Being soil-dwelling pests

Nematodes are primarily known in an ecological context for being soil-dwelling pests. Many species of nematodes inhabit the soil and can play significant roles in ecosystems, often influencing plant health and soil quality. While some nematodes can be beneficial, particularly those that act as predators of pests or contribute to nutrient cycling, a substantial number are known for their negative impacts on agriculture and horticulture. These plant-parasitic nematodes feed on the roots of various plants, leading to stunted growth, reduced yields, and even plant death. This association with damaging plants solidifies their reputation as pests in many agricultural settings. The other options are less accurate as nematodes do not function as pollinators or cause structural damage to buildings, nor are they primarily known for helping plants grow, although certain types of nematodes may contribute positively to plant health in specific contexts.