Which insect has Complete metamorphosis, Chewing mouthparts, and belongs to Coleoptera?

• A. Monarch Butterfly
• B. Northern Corn Rootworm
• C. Oriental Cockroach
• D. Minute Pirate Bug

Answer: (B)

Complete metamorphosis in beetles means four life stages: egg, larva, pupa, and adult, with the adults and many larvae using chewing mouthparts to bite and chew food. The Northern Corn Rootworm is a beetle (order Coleoptera), so it has holometabolism and the typical chewing mouthparts of beetles, matching the criteria.

The Monarch Butterfly also undergoes complete metamorphosis, but its adults have siphoning mouthparts adapted for nectar, not chewing, and it is not a beetle. The Oriental Cockroach is not a beetle and belongs to a different order with different developmental biology. The Minute Pirate Bug is a true bug with piercing-sucking mouthparts and is not a beetle.