Why do aphids produce honeydew?

Answer: Excess sugar from plant sap

Excess sugar from plant sap ✓ — Correct! Aphids pierce plants and drink sap—which is mostly sugar water but low in protein. They extract the protein they need and excrete excess sugar as sticky honeydew droplets. Ants 'farm' aphids for this sweet waste, protecting them from predators in exchange!

Attracting mates with sweetness — Wrong. Honeydew isn't for attracting mates—it's waste! Aphids produce it because plant sap contains way more sugar than they can use.

Marking territory for colony — Wrong. Honeydew is metabolic waste, not a territorial marker. The sticky droplets accumulate on leaves below where aphids feed.