A study published today in Cell claims that plants produce "airborne sounds" when they are thirsty or under stress. According to the authors, plants that are thirsty or have recently had their stems cut can make up to 35 sounds per hour. However, well-hydrated and uncut plants are much more silent, producing only one sound every hour or so. Due to the ultrasonic nature of the sounds—which range from 20 to 100 kilohertz—you have probably never heard a thirsty plant make any noise. Thus, only a very small number of humans could hear them due to their extremely high pitch.
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