Which of the following is not a response to stimulus

Choose the correct answer: Which of the following is response to stimulus?

Which of the following is not responsible for hardness of water?

Which of the following is responsible to rule out the existence of definite paths or trajectories of electrons ?

Which of the following is contaminant responsible for Bhopal gas tragedy?

Which of the following is contaminant responsible for Bhopal gas tragedy

Which of the following is responsible for slee wake cycle movement?

Which of the following is responsible for division in fertilized egg ?

Ninhydring reasgent reacts with acids to give a purple colour. In the reaction of ninhydrin with phenylalanine, which of the following is responsible for this colour ?

Which among the following is responsible for rains on earth?

Which of the following is mainly responsible for depetion of ozone layer?