Associate Certified Entomologist (ACE) Practice Exam

Trail pheromones are used by insects to:

1. Communicate danger

2. Signal to mates

3. Lead others to food sources

4. Mark territory

The correct answer is: Lead others to food sources

Trail pheromones are a chemical signal utilized by insects to lead others to food sources. These pheromones are especially important for social insects like ants and bees, which rely on cooperative foraging. When an individual finds a food source, it will lay down a trail of pheromones as it returns to the nest. Subsequently, other members of the colony can detect this pheromone trail and follow it to the food. This process enhances foraging efficiency, ensures food resources are optimally utilized, and supports the overall functioning of the colony. While other options mention vital behaviors in insect communication, they do not specifically relate to the purpose of trail pheromones. For instance, signaling danger typically involves different types of pheromones aimed at alerting the colony to threats, while pheromones used for mating communicate reproductive readiness or attract potential mates. Additionally, marking territory is generally achieved through distinct pheromonal signals that indicate ownership or presence rather than guiding towards food sources.