Question : The harmful substances produced by the microbes are known as:
Option 1: antibiotics
Option 2: pollutants
Option 3: hormones
Option 4: toxins
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Correct Answer: toxins
Solution : The correct answer is toxins .
The microbial toxin is a harmful substance produced by microorganisms which negatively impacts the human immune system. These are produced by microorganisms like bacteria, fungi, protozoa, dinoflagellates, etc. It is of two types: endotoxins and exotoxins. Endotoxins are generated by bacteria and actively secreted, while exotoxin is part of the bacterial membrane and is secreted only when bacteria are killed by the immune system.
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