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Why Do we Fall Ill — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceWhy Do we Fall Ill1 Mark
MCQ
Vectors can be defined as
  • ✓
    Animals carry the infecting agents from sick person to another healthy person.
  • B
    Microorganisms which cause many diseases.
  • C
    Infected person.
  • D
    Diseased plants.
✓

Answer

Correct option: A.
Animals carry the infecting agents from sick person to another healthy person.
Vectors or intermediaries are animals insects that carry the infecting agents from a sick person to another healthy person. Mosquitoes $($for malaria, filariasis, yellow fever and dengue$),$ flies $($typhoid, kala $-$ azar, sleeping sickness$),$ louse $($typhus$)$ and rat $($for plague$).$

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