Question

All microorganisms are _______ to the human body.
A. Not harmful
B. Harmful
C. Important
D. None of these

Answer 1

Hint: The microbes play an important role in human lives. From causing disease or being used in food processing, they are present everywhere around us.

Complete answer: Microorganisms or microbes are minute living particles that surround us constantly. Microbes are present in every habitat, ranging from ice cold glaciers to the burning volcanoes. They are so small in size that they cannot be seen with naked eyes. Humans have known them since the discovery of the microscope. Their size ranges from a few micrometers to millimeters. Some of them are serious parasites, while some of them are healthy to eat.

-Option A says that microorganisms are not harmful to the human body. Well, this statement is diplomatic. Not all microbes are not harmful to us. Some of the parasitic microbes cause serious illness to the human body. For example, Salmonella typhi causes Typhoid fever in humans.
-Option B says that microorganisms are harmful to the human body. But it is known that we have microbes in our gut that help us in digestion and other metabolic processes. Some microbes are used in food processes such as fermentation. Bread, curd, and alcohol are all the products of microbes.
-Option C says that microorganisms are important to the human body. The human body is home to many of the good-microbes that majorly live in our guts. Moreover, probiotics are made from microbes and are part of a healthy diet.
Thus, the right answer is option C

Note: There are dangerous characteristics of microbes, scientists can make antibiotics or antivirals that help to cure bacterial or viral diseases respectively. A good example of this is penicillin. It was isolated from the fungus Penicillium and now is used as a major antibiotic for various bacterial infections.