Diseases are classified based on which of the following factors?

Q. A person is suffering from Ascariasis. Mention the pathogen causing the disease and an organ of the body affected, three symptoms and one mode of transmission of the disease.

Q. Given below are certain diseases and their causative agents. One of these disease is transmitted through eggs of a unisexual organism, that are present in the faeces of an infected person. Identify the diseases which is caused by a unisexual worm.

Q. Some micro-organisms are pathogenic because they cause diseases. Study the following table which shows a list of diseases in humans in Column X. In Column Y, the main causative agents of the diseases are listed in an incorrect sequence.
The correct sequence of the main causative agents, which match diseases (a), (b), (c)and (d) respectively, may be represented by