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

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(a)     Microorganisms can be seen with the help of a Microscope.
(b)     Blue-green algae fix Nitrogen directly from the air and enhance the fertility of the soil.
(c)     Alcohol is produced with the help of Yeast.
(d)     Cholera is caused by Bacteria.

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