<b>When we touch a hot plate unknowingly, then this heat is sensed by a receptor P present in our fingers. The receptor triggers an impulse in neuron Q which transmits the message to an organ R which is a part of the central nervous system. Here the impulse is passed on to a neuron S which in turn passes it to a yet another neuron T. The neuron T passes the impulse to a issue U in our arm. The tissue U then contracts and pulls our hand away from the hot plate.</b><b>(a) </b>What is the name of (i) receptor P (ii) neuron Q, and (iii) organ R?<b>(b)</b> What is (i) neuron S, and (ii) neuron T?<b>(c) </b>Name the tissue U.<b>(d) </b>What name is given to the phenomenon in which hand is pulled away quickly from the hot plate?<b>(e) </b>Name the effector in this whole process.