Even Trees Are Calling For Rescue

 Scientists have recently found that tree emits  sounds when it's  finds itself in risk. We already    know that the tree gets the water it needs throw  bundle of xylem. Due to the attractive force  between water molecules within each other and the plant cells, drops of water can reach the highest top in a tree. But if the land was dry, the interaction pressure may lead to the breakage of the trunk, this leads to the formation of gas bubbles that block water flow. This is what's known by cavitation. This process may cause death for some trees. French scientists have performed a vitro experiment to prove that process using microphones. They placed a piece of pine plant in water then evaporated it to have drought conditions.  Scientists have recorded several sounds which are ultrasounds that the human being can't hear. According to this study, a device will be designed to receive such sounds from stressed trees to water them in drought cases. This approach will save many trees especially in tropical rain forests.