Correct Option
The correct option isAntibiotics are used to cure a variety of diseases in humans, animals, and plants.
Explanation
Microorganisms are extensively utilized in the medical field for the production of antibiotics and vaccines. These applications rely on the biological properties of microbes to combat infections or induce immunity in various biological systems.
Option Analysis
- Antibiotics are effective against both bacterial and viral infections. is Incorrect: Antibiotics target specific bacterial structures (such as cell walls) or metabolic pathways. Viruses do not possess these structures or independent metabolic machinery; therefore, antibiotics are ineffective against viral infections.
- Antibiotics are used to cure a variety of diseases in humans, animals, and plants. is Correct: Antibiotics are used to treat various bacterial diseases in humans (e.g., Tuberculosis, Cholera). They are also administered to animals (livestock and poultry) to prevent infections and are applied in agriculture to control bacterial diseases in plants.
- Vaccines function by introducing fully active pathogens into the body. is Incorrect: Vaccines function by introducing dead, attenuated (weakened), or specific parts of a pathogen (antigens) into the body. Introducing a fully active pathogen would cause the disease rather than prevent it.
- Antibodies are synthetic chemicals produced by pathogens to fight the host. is Incorrect: Antibodies are proteins produced by the host's immune system (specifically B-lymphocytes) in response to foreign invaders. They are not synthetic chemicals, nor are they produced by the pathogens themselves.
Key Takeaway: Antibiotics are antibacterial agents used in humans, animals, and plants, whereas vaccines rely on immunological memory triggered by inactivated or weakened microbes.