Learn answers of following questions. 1.What is a disease? Classify it with examples. 2.What are the general disadvantages of having a cronic disease? 3.A person was bitten by a stray dog. After some days his nature gets irritated,he started fearing water-- (1) Name the disease. (2) Is there any vaccine available? (3)Is there any plan of your local authority for the control of this disease? 4. Who discovered' Vaccine' for the first time?Name the two diseases which can be prevented by using vaccines? 5.How can you justify the statement 'prevention is better than cure'