Can Plants Hear Caterpillars Eating Them?
This video will you an idea of how the study was performed:
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At least one type of plant can 'hear' itself being eaten and takes measures to save itself. This was reported earlier this month by a new study. The flower plant, called Arabidopsis thaliana, can detecet pattern of vibrations caused by a chewing sound, and launches a chemical defense to deter the voracious worm or other animal eating its leaves. 
Researchers already know, from past
studies, that plants have reactions to external stimuli such as wind,
touch and acoustic energy (playing music for plants). It
was the realization that music can affect plants that gave rise to the
idea of checking what else plants can hear and react to.
In the study, researchers played a
recording of a caterpillar munching on leaves to the plants, while a
control group was not played anything. They then waited for 24-48 hours
to see what happened. The results were remarkable. In the group of
plants that 'listened' to the sounds of chewing, released higher
amounts glucosinolates (like mustard oil), an unappealing chemical for
the bugs.
so, does this change our perspective
on plants as living creatures? Are they 'afraid' when they hear these
sounds, thereby using a defense? It is unclear at this point. What is
clear, is that there is a lot more to plant life than meets the eye...
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