exercise #2

In the researches about plants, I focused on plants growth, which I think basically is plants movement. In general, plants' growth has to do with lights. They react differently under different light sources, also in the different environment. How we can tell a plant react to something o their movement? They make sounds. Researchers found out when a dehydrated piece of plant, expose light on, you can hear they make sounds like "ouch". Then I tried to make a digram, which it seems need some special equipment. Because the sounds plants make are in high frequency, ordinary human ears are not be able to hear them. In order to hear the sound, need a high frequency sound recorder, then slower down the frequency rate to the normal hearable rate.