In Aphididae, cornicles are associated with which function?

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Study for the Science Olympiad Entomology Exam. Dive into entomology with flashcards and multiple-choice questions. Each question comes with hints and explanations to help you ace your exam!

Multiple Choice

In Aphididae, cornicles are associated with which function?

Explanation:
Cornicles are paired tubular glands on the posterior of aphids that discharge defensive secretions. Their primary function is to produce alarm pheromones that warn other aphids of danger and can trigger dispersal or defensive behavior, helping the colony respond quickly to threats. Context helps make sense of the other options: honeydew is the sugary waste excreted as aphids feed on plant sap, not something produced by the cornicles; some aphids can be winged or wingless, so not all forms have two wings; and aphids reproduce on plants rather than laying eggs in water.

Cornicles are paired tubular glands on the posterior of aphids that discharge defensive secretions. Their primary function is to produce alarm pheromones that warn other aphids of danger and can trigger dispersal or defensive behavior, helping the colony respond quickly to threats.

Context helps make sense of the other options: honeydew is the sugary waste excreted as aphids feed on plant sap, not something produced by the cornicles; some aphids can be winged or wingless, so not all forms have two wings; and aphids reproduce on plants rather than laying eggs in water.

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