Fill in the blanks.
(a) Microorganisms can be seen with the help of a _.
(b) Blue green algae fix _ directly from air to enhance fertility of soil.
(c) Alcohol is produced with the help of _.
(d) Cholera is caused by ___.

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Solution

(a) Microorganisms are microscopic in size. Human eye is unable to see at such microscopic size. For observing microorganisms, microscope is used.
(b) Blue green algae fix Nitrogen directly from air to enhance fertility of soil. Nitrogen fixing bacteria are of two types: free living (non-symbiotic) such as cyanobacteria, Anabena and symbiotic bacteria such as Rhizobium.
(c). Alcohol is produced with the help of yeast. Yeast is an unicellular, eukaryotic microorganism which is used widely in fermentation industry.
(d) Chloera is caused by Vibrio cholerae. Vibrio cholerae is a Gram negative, comma-shaped bacterium.
So, the correct answer is
a- microscope
b-Nitrogen
c- Yeast
d-Vibrio cholerae

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Microorganisms can be seen with the help of a ___ .

Microorganisms can be seen with the help of a ___.

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