Plants cannot and do not feel pain as plants have no pain receptors, brain or nervous system.
Plants can't feel pain or hunger like animals, but their cells can communicate stress in a way that's not so different from what animals do.
All insects including Ants don't feel pain like humans do either.
However ants do feel some type of pain called nocipetion and irritation like pain.
Nociception is the detection of painful stimuli.
Specialized neurons in the dorsal root ganglia (DRG) or the trigeminal ganglia project into skin and soft tissue to detect extremes of heat, cold, mechanical, and chemical signals and alert the body of potential dangers.
Ants are eusocial insects of the family Formicidae and, along with the related wasps and bees, belong to the order Hymenoptera.
Ants appear in the fossil record across the globe in considerable diversity during the latest Early Cretaceous and early Late Cretaceous, suggesting an earlier origin.
An annoyance more than anything else, most ants in the United States aren't directly harmful to people.
If left to run amok, however, ants can destroy structures, spread bacteria and, in extreme cases, cause serious allergic reactions.
That's why it's best to nip an ant infestation in the bud.
Insects and bugs have been found to feel something akin to acute pain called “nociception.
The pain is not the same as we humans feel but is more like irritation according to scientists research.
Insects do not have pain receptors the way vertebrates do.
They don't feel 'pain,' but may feel irritation and probably can sense if they are damaged.
Even so, they certainly cannot suffer because they don't have emotions.