One function of the bacterial secretion produced by female beewolves is to cue larval cocoon orientation.

One function of the bacterial secretion produced by female beewolves is to cue larval cocoon orientation.

• A. It cues larval cocoon orientation.
• B. It repels vertebrate herbivores.
• C. It acts as a pheromone for mate attraction.
• D. It provides a food source for larvae.

Answer: (A)

The key idea is that microbial symbionts can emit chemical signals that influence how the host develops and behaves, not just provide nutrition or defense. Female beewolves carry and inoculate their brood with symbiotic bacteria that produce secretions used in the cocoon stage. While these secretions help protect the cocoon from fungal pathogens, they also include signals that larvae can sense to orient the cocoon during pupation. This orientation cue ensures the cocoon forms in the correct position for successful emergence in the nest environment. The other ideas—repelling vertebrate herbivores, acting as a pheromone for mate attraction, or serving as a food source for larvae—don’t reflect the observed role of this bacterial secretion; its documented function in this system includes guiding larval cocoon orientation.

The key idea is that microbial symbionts can emit chemical signals that influence how the host develops and behaves, not just provide nutrition or defense. Female beewolves carry and inoculate their brood with symbiotic bacteria that produce secretions used in the cocoon stage. While these secretions help protect the cocoon from fungal pathogens, they also include signals that larvae can sense to orient the cocoon during pupation. This orientation cue ensures the cocoon forms in the correct position for successful emergence in the nest environment. The other ideas—repelling vertebrate herbivores, acting as a pheromone for mate attraction, or serving as a food source for larvae—don’t reflect the observed role of this bacterial secretion; its documented function in this system includes guiding larval cocoon orientation.