Define disease symptoms.

The interval between infection and appearance of disease symptoms is called:

Define disease and health ?

Define chronic diseases.

Shievering and high fever are the common symptoms of malaria in humans. Explain the cause of these symptoms.

What are the symptoms of phosphorus deficient plant? Where do these symptoms first appear in a plant?

Write the causative organism, mode of infection, symptoms and the preventive measures of the disease Leprosy.

Write the name of causative organism, symptoms and mode of transmission of disease Typhoid.

Define drug addiction. Give the symptoms and control measures of drug addiction.