Is it possible for something to think without any brain? Okay let me rephrase my question. Are plants capable of thinking? No? Think again! It seems that carnivorous pitcher plants has been doing just that for who knows how long.
How do you explain their ability to change their bug catching approach in order to survive? Every living being knows what survival of the fittest is, even plants do. This may be the only reason why pitcher plants are able to find an alternative approach in catching bugs.