write an activity to show the presence of microorganisms in air
Answers
Answer:
Airborne microbes are biological airborne contaminants (also known as bioaerosols) like bacteria, viruses or fungi as well as airborne toxins passed from one victim to the next through the air, without physical contact, causing irritation at the very least (Earth Materials and Health
Explanation:
When analysing the air for its micro-organism content, one must either soak air through a filter or through water, in which the microorganisms are held back. The air sample does not consist of a bag of air, but of a bottle of water or a dry filter.
Aim To show the presence of microorganisms in moist soil.
Materials Required
Garden soil, water, glass rod, filter paper, slide, beaker and microscope.
Theory
Organisms that are visible only through a microscope are called microorganisms. They vary in shape, size and characteristics that either makes them helpful or harmful to human beings.
Procedure
(i) Take some garden soil in a beaker and add a little water to it. Mix it well with glass rod .
(ii) Filter the solution with the help of a filter paper.
(iii) Collect a drop of the filtrate on a glass slide and then observe it under a microscope. Observations Small organisms can be observed floating in the drop of soil sample.
Conclusion
Moist soil contains microorganisms. Precaution (1) While handling soil samples you must wear gloves.
(ii) Wash your hands properly after the experiment.
hope it helps
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