Comprehensive Entomology – Morphology, Behavior, Evolution, and Pest Management Practice Test

Think of the mosquito’s feeding tube as a tiny multi-needle assembly. The proboscis is made up of six needle-like stylets that work together to pierce the skin and draw blood. Two are the mandibles and two are the maxillae, which act as piercing blades, while the remaining two—the labrum (with the epipharynx) and the hypopharynx—form internal channels that guide blood into the mouth and saliva into the wound. The labium serves as a protective sheath around these parts. This six-part needle arrangement explains why the statement describing six needle-like components is the best fit: it accurately reflects the structural design that enables the mosquito to feed efficiently. The other ideas don’t fit: the proboscis isn’t simply two segments long, it isn’t a venom-delivery system (mosquito saliva aids feeding but isn’t venom), and it isn’t made of dozens of hairs forming the whole structure.