What is the primary function of an insect's antennae?

The primary function of an insect's antennae is to serve as versatile sensory organs that primarily detect environmental stimuli, including chemical cues, touch, and sometimes even sound vibrations. The antennae are equipped with specialized receptors that can pick up on various sensory information, allowing insects to interact effectively with their surroundings. This includes detecting pheromones or other scent chemicals, which are crucial for communication and mating behaviors, as well as sensing physical contact and vibrations.

While touch sensitivity is a key aspect of what the antennae do, they also play a role in balance and navigation, helping insects maintain orientation in their environment, but the most critical and defining function remains their role in sensory input. This is why the correct answer focuses on sensory functions, particularly touch, which encapsulates the broad range of sensations that antennae facilitate.