Plants can respond to the any change in the surrounding environment and adapt themselves by modifying their morphological, anatomical, physiological or behavioural changes. But they may not feel like animals because they didn’t have any nervous tissue or brain.
Yes, very much plants feel the touch. Most of the plant species may not show phenotypic expression/modifications unlike plant called Mimosa pudica (touch me not plant). it is very well proved that plants grow very well even for music sound. when insect bites plants, they generally express genes involved in both antibiosis and antixenosis resistance mechanism. Antibiosis, which reduces insect feeding, growth rate, or survival. Antixenosis,which affects insect settling, colonization, or oviposition