In a school, students are asked to save electricity both at school and home. They are told to switch off the lights and fans before leaving the class rooms. Two best friends Vijay and Ajay are in class 10th. Vijay saves electricity by switching the appliances off when not in use while Ajay makes fun of his habits. He always leaves the T.V. and computer ON. On the basis of above passage, answer the following questions: (a) Why is it necessary to save energy? (b) Which type of character is possessed by the friends?