Incomplete development in insects or simple metamorphosis?

Incomplete development in insects or simple metamorphosis?

• A. Egg, nymph, adult
• B. Egg, chrysalis, adult
• C. Egg, larva, pupa, adult
• D. Egg, larva, adult

Answer: (A)

Insects that undergo incomplete development, or simple metamorphosis, go through stages where the immature form (a nymph) resembles a scaled-down adult and there is no pupal stage. They shed their skin several times (molts) as they grow until they reach full size and reproductive maturity. That makes the sequence egg → nymph → adult the correct description for this type of development. The other sequences imply a pupal stage or a true larval stage, which belongs to complete metamorphosis. A chrysalis or pupa indicates a distinct, non-feeding pupal stage between larva and adult, while a larva is the larval form typical of complete metamorphosis. Hence those options don’t describe incomplete development.

Insects that undergo incomplete development, or simple metamorphosis, go through stages where the immature form (a nymph) resembles a scaled-down adult and there is no pupal stage. They shed their skin several times (molts) as they grow until they reach full size and reproductive maturity. That makes the sequence egg → nymph → adult the correct description for this type of development.

The other sequences imply a pupal stage or a true larval stage, which belongs to complete metamorphosis. A chrysalis or pupa indicates a distinct, non-feeding pupal stage between larva and adult, while a larva is the larval form typical of complete metamorphosis. Hence those options don’t describe incomplete development.