Nematodes are best described as

• A. Microscopic hair-like worms in the soil that feed on plant roots
• B. Insects
• C. Fungi
• D. Bacteria

Answer: (A)

Nematodes are microscopic, thread-like roundworms that live in the soil. This description fits because many nematodes that affect plants are tiny, worm-shaped organisms that inhabit the soil and feed on plant roots, often by piercing root cells. They’re not insects, fungi, or bacteria—each of those groups has a distinct biology: insects are six-legged arthropods with complex bodies; fungi are organisms with hyphae and spores; bacteria are single-celled prokaryotes. So describing nematodes as microscopic hair-like worms in the soil that feed on plant roots accurately captures their size, shape, habitat, and feeding behavior.