how plants communicate?

here's little something before starting to study.

have you ever wonder, do plants ever communicate with each other even tho it is classified under living organisms? Plants are rooted to the ground and have very minor change in 'posture' over a period of time. they have no mouth nor eyes nor ears nor any of the senses all animals have. They do 'talk' only in cartoons.

there was this on the radio while having breakfast:

when one of the tree, of a type of plant [dunnoe wads the name], is being bit by an animal, the rest of that plant in the surrounding will emit a poison or something.

a scientist wonders how 'they' get to know of the surrounding changes. so he did different tests and found out that the plants communicate through light. they gave out signals in the form of light which, as usual, human cant see with their naked eyes. the light can only be detected by a device.

haha ... now we den know that light can also be given out by plants other than our light bulbs and sun. Maybe next time we can use plant as the source of light energy at nite to lit our paths. Who knows? It will be of additional help to save the earth.

=D