Question

Organisms that are visible under the microscope but invisible to the naked eye are called
a) Micro-organisms
b) Herbivores
c)Bioaugmented organisms
d)Rusts

Answer 1

Hint The organism which is not visible to the naked eye is the very small and minute organism like the virus, bacteria, and fungi. They are usually visible under the microscope. The organism which is visible to the naked eye is the macro-organisms. They have enlarged structures and do not need the microscope for viewing.

Complete answer: The organism which is present in the small minute structures and is not visible to the naked eye are known as the micro-organism. These microorganisms can only be viewed when placed under the microscope. They have sizes varying from nanometre to micrometer. The study of the microorganism is known as microbiology. This branch of the science usually deals with the working of the microorganisms. The micro-organism can be harmful to human beings and can also be very useful for the human being. These organisms are mostly pathogenic in nature, but they are also used in the medicines for the treatment of certain diseases.

Additional information:
-Herbivores are those organisms that feed on the grass and plants for their food source. Such animals are known as the herbivorous animals. These animals derive the source of their nutrients from the plants and fodder being provided to them. These animals are ruminant in nature. These animals have a special type of stomachs that differ from the non-ruminant animals.
-Bioaugmentation organisms are those organisms that are specifically used for the degrading of the particular land or the groundwater for the removal of the contamination from them. These microorganisms degrade the specific contaminant.

So, the answer is ‘micro-organisms’.

Note: The microorganism is present in the air, soil, water and can live in extreme conditions as that of salty water or can survive very high temperatures. These organisms are both autotrophic and heterotrophic in nature.