Nematodes have which life cycle progression?

Nematodes have which life cycle progression?

• A. Egg -> Juvenile -> Adult
• B. Egg -> Larva -> Fry -> Juvenile -> Adult
• C. Egg -> Larva -> Pupa -> Adult
• D. Egg -> Nymph -> Adult

Answer: (A)

Nematodes develop through a series of molts from egg to adult, with several immature stages before reaching maturity. After the egg hatches, it becomes a juvenile and then molts through multiple instars (commonly labeled J1 through J4) before becoming an adult. There isn’t a pupal or nymph stage, and the term “fry” isn’t used for nematodes. The progression is therefore egg -> juvenile -> adult, with the juvenile phase representing the successive molts between hatching and adulthood. The other options include stages like larva, fry, pupa, or nymph, which belong to other groups or imply metamorphoses that nematodes don’t undergo.

Nematodes develop through a series of molts from egg to adult, with several immature stages before reaching maturity. After the egg hatches, it becomes a juvenile and then molts through multiple instars (commonly labeled J1 through J4) before becoming an adult. There isn’t a pupal or nymph stage, and the term “fry” isn’t used for nematodes. The progression is therefore egg -> juvenile -> adult, with the juvenile phase representing the successive molts between hatching and adulthood. The other options include stages like larva, fry, pupa, or nymph, which belong to other groups or imply metamorphoses that nematodes don’t undergo.