Which of the following organisms does not undergo incomplete metamorphosis?

1. Analyze the question We need the organism that does NOT undergo incomplete metamorphosis. In other words, we are looking for the one that undergoes complete metamorphosis.

2. Explain the concept

• Complete metamorphosis (holometabolous): has four stages: egg → larva → pupa → adult. The larva looks very different from the adult.
• Incomplete metamorphosis (hemimetabolous): has three stages: egg → nymph → adult. There is no pupa stage, and the nymph looks like a small version of the adult, growing through moulting.

3. Solution, step by step

• A. Locust: egg → nymph → adult. This is incomplete metamorphosis.
• B. Grasshopper: egg → nymph → adult. This is incomplete metamorphosis.
• C. Butterfly: egg → caterpillar (larva) → pupa (chrysalis) → adult butterfly. This is complete metamorphosis.
• D. Cockroach: egg (in an ootheca) → nymph → adult. This is incomplete metamorphosis.

Only the butterfly has a pupa stage, so it is the only one that does not undergo incomplete metamorphosis.

4. Answer C. Butterfly.

5. Exam tip Remember: "Pupa = Complete." If an insect has a pupa stage (butterfly, housefly, mosquito, bee, moth), it is complete metamorphosis. If the young one is a nymph (locust, grasshopper, cockroach, termite), it is incomplete. Keep going, you are doing well!