What are the sounds known as "piping" made by queen bees?

The sounds known as "piping," made by queen bees, are indeed best associated with quacking and tooting. This unique vocalization occurs primarily during the swarm process when the queen is preparing to leave the hive or when she is communicating with her workers. Piping is a high-pitched sound that can serve various purposes, such as signaling her presence, indicating readiness to swarm, or calling workers.

The other options do not accurately represent the specific sounds produced by queen bees. Buzzing and humming are general sounds associated with bees in flight or during foraging and do not specifically describe queen sounds. While singing and whistling suggest melodic tones that do not accurately capture the nature of bee sounds, chirping and cooing imply a softer, more bird-like sound that doesn't correlate with the characteristics of bee vocalizations. Thus, the term "piping" clearly aligns with the description of quacking and tooting.