Where are plant-parasitic nematodes usually found?

• A. In soil near roots
• B. In leaves
• C. In the atmosphere
• D. In fruit

Answer: (A)

Plant-parasitic nematodes are tiny, soil-dwelling roundworms that feed on plant roots. They move through the soil to find root tips and feeding sites, so their typical habitat is the soil in and around the root zone—the rhizosphere. This proximity to roots allows them to pierce root cells with their stylet and extract nutrients, which often harms the roots and reduces the plant’s ability to take up water and nutrients.

Leaves, the atmosphere, or fruit are not their usual habitats for the common plant-parasitic nematodes that affect ornamentals and turf; those areas may harbor other organisms, but the nematodes that damage roots are primarily found in soil near roots. So the best answer is that they are found in soil near the root system.