Ian Grainger / Alamy Stock Photo
Evening primrose flowers can hear approaching bees and quickly make their nectar sweeter in response to the sound.
Lilach Hadany and colleagues at Tel-Aviv University, Israel, collected nectar from flowers before and after exposing them to a range of sounds, including recordings of bees and synthetic noises.
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Within three minutes of exposure to bee sounds or artificial sounds of a similar frequency, the flowers increased the concentration of sugar in their nectar by 20 per cent on average. There was no change in sugar levels in flowers played …