Vectors can be defined as:

  • A
    Diseased plants
  • B
    Microorganisms which cause many diseases
  • C
    Infected person
  • D
    Animals that carry the infecting agents from a sick person to another healthy person

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List three harmful effects of infectious disease.

Which disease is not transmitted by mosquitoes?

Write the names of three diseases caused by viruses. Give a full account of any one of them.

Which of the following diseases is caused by bacteria?

Classify the following diseases as infectious or non-infectious:
$(a)$ $AIDS$
$(b)$ Tuberculosis
$(c)$ Cholera
$(d)$ High blood pressure
$(e)$ Heart disease
$(f)$ Pneumonia
$(g)$ Cancer

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