What is one responsibility of an umpire during a game?

An umpire's responsibility to whistle to start and end each quarter is crucial because it ensures the game's flow and maintains structure. The umpire acts as the authority on the court, signaling when play begins and when pauses are needed, such as at the end of a quarter. This function is integral to netball, as it helps players and spectators alike know when the game is in progress and helps to regulate the timing of play, assisting in maintaining the game’s pace and order. By doing so, the umpire ensures that all players are ready and aware of the game's status, which is essential for fair play and competitive integrity.