Question

The disease that is caused by viral infection is?
1. Cholera
2. Typhoid
3. Tetanus
4. Common cold
5. None of these

Answer 1

Correct Answer - Option 4 : Common cold

The correct answer is Common cold.

• The disease that is caused by viral infection is the Common cold.

• Virus:
  • The virus was discovered by Russian scientist Ivanovsky.
  • In nature, there are ultra-microscopic particles known as viruses.
  • Viruses are a connecting link between living and nonliving organisms.
  • Characteristics of Virus:
    • They become active inside living cells.
    • Nucleic acids replicate themselves and reproduce rapidly.
    • They cause diseases like bacteria and fungi.
    • In man viruses cause diseases like mumps, chickenpox, hepatitis, polio, AID, and Herpes.
    • Bacteriophages: Bacteriophages are those viruses that infect bacteria.
      • Example: Tobacco mosaic virus.

• Cholera, typhoid, and Tetanus are caused by bacteria.
• Bacteria:
  • It was discovered by Antonie van Leeuwenhoek.
  • Leeuwenhoek is called the father of Bacteriology.