Which metamorphosis type includes four stages: egg, larva, pupa, and adult?

Which metamorphosis type includes four stages: egg, larva, pupa, and adult?

• A. Incomplete metamorphosis
• B. Gradual metamorphosis
• C. No metamorphosis
• D. Complete metamorphosis

Answer: (D)

Metamorphosis in insects describes how their life stages are organized and how much they change as they grow. The four-stage pattern—egg, larva, pupa, and adult—is known as complete metamorphosis. The key feature is the pupal stage, a time of dramatic transformation where the larva’s tissues are broken down and rebuilt into the adult body plan, so the larva and adult often look very different. This is seen in many familiar insects like butterflies, moths, beetles, bees, and wasps. In contrast, incomplete metamorphosis has three stages—egg, nymph, and adult—with nymphs that resemble smaller versions of the adult and no pupal stage, so there isn’t a drastic change in form. Some organisms show essentially no metamorphosis, maintaining a similar body form from immature to adult. Because the question specifies a four-stage sequence that includes a pupal stage, the correct concept is complete metamorphosis.

Metamorphosis in insects describes how their life stages are organized and how much they change as they grow. The four-stage pattern—egg, larva, pupa, and adult—is known as complete metamorphosis. The key feature is the pupal stage, a time of dramatic transformation where the larva’s tissues are broken down and rebuilt into the adult body plan, so the larva and adult often look very different. This is seen in many familiar insects like butterflies, moths, beetles, bees, and wasps. In contrast, incomplete metamorphosis has three stages—egg, nymph, and adult—with nymphs that resemble smaller versions of the adult and no pupal stage, so there isn’t a drastic change in form. Some organisms show essentially no metamorphosis, maintaining a similar body form from immature to adult. Because the question specifies a four-stage sequence that includes a pupal stage, the correct concept is complete metamorphosis.