the researchers recorded both healthy and stressed tomato and tobacco plants using microphones. They conducted experiments in a soundproof chamber and later in a greenhouse with background noise. The plants were stressed in two ways, by withholding water for several days and by cutting their stems. The team then trained a machine learning algorithm to distinguish between healthy plants, dehydrated plants, and cut plants.

audio is uploaded in the article

Source : https://scitechdaily.com/scientists-discover-plants-scream-we-just-couldnt-hear-them-until-now/