Answer:
one terminal of the ex-or gate should be connected to a high input(1 or 5V). the other terminal is used as the input terminal,since not gate has only one input.when we give a high to this input, now the inputs of exor gate are 1 & 1.so output is 0.when we give a low to the input , then the inputs of ex-or gate are 0 and 1, output is 1. Hence it works as a controlled inverter.