Q42 of 104 Page 40

What are micro-organisms? Give any two examples of micro-organisms.

The organisms which are too small to be seen by the naked eyes and can be seen only though a microscope are called micro-organisms or microbes. Bacteria and viruses are examples of micro-organisms.


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Fill in the following blanks with suitable words:

(a) Alcohol is produced with the help of ............


(b)Blue-green algae fix................directly from air to enhance fertility of soil.


(c) Micro-organisms can be seen with help of a..........


(d) Cholera is caused by..............


(e) Common salt has been used to preserve............. and ............ for ages.


(f) The food material which is preserved by pasteurization is .................


(g) As a result of nitrogen cycle, the percentage of nitrogen in the atmosphere remains more or less…….

 41

How do viruses differ from other micro-organisms such as bacteria?

 43

Can micro-organisms be seen with the naked eye? If not, how can they be seen?

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How do houseflies carry disease-causing microbes-(or pathogens)?