In the context of evolution and natural selection, which stage is unique to the hemimetabolous lifecycle?

• A. Larva
• B. Nymph
• C. Adult
• D. Pupa

Answer: (B)

Verified step by step guidance

1. Understand the concept of hemimetabolous lifecycle: Hemimetabolous insects undergo incomplete metamorphosis, which includes three stages: egg, nymph, and adult. Unlike holometabolous insects, they do not have a pupal stage.
2. Identify the stages of the hemimetabolous lifecycle: The stages are egg, nymph, and adult. The nymph stage is unique to hemimetabolous insects as it is absent in holometabolous insects.
3. Compare the lifecycle stages: In holometabolous insects, the lifecycle includes egg, larva, pupa, and adult. The larva and pupa stages are not present in hemimetabolous insects.
4. Recognize the nymph stage: The nymph stage resembles the adult but is smaller and lacks fully developed wings and reproductive organs. It is a key stage in hemimetabolous development.
5. Conclude the unique stage: Based on the lifecycle comparison, the nymph stage is unique to hemimetabolous insects, distinguishing them from holometabolous insects.