What purpose do brochosomes serve for leafhoppers?

• A. They enable flight muscles
• B. They provide a highly water-repellent, anti-reflective coating
• C. They function as scent glands
• D. They help in molting

Answer: (B)

Brochosomes form a protective surface coating for leafhoppers that makes the exterior both water-repellent and anti-reflective. These microscopic particles produced by specialized glands spread over the insect’s cuticle, creating a highly structured surface. The hydrophobic coating causes water to bead up and roll off, helping the insect stay dry and light when moving on wet leaves or in rain. At the same time, the coating reduces light reflection from the body, helping the leafhopper blend with the leaf’s surface and avoid detection by predators in bright, sunlit conditions. These combined properties are well-suited to a small sap-feeding insect that spends most of its life on plant surfaces. The other options don’t fit because brochosomes aren’t involved in flight muscle function, aren’t scent glands, and aren’t used in molting.