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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 air to enhance fertility of soil.
(c) Alcohol is produced with the help of __________.
(d) Cholera is caused by __________.
(a) Microorganisms can be seen with the help of a _ microscope _.
(b) Blue green algae fix __ nitrogen _ directly from air to enhance fertility of soil.
(c) Alcohol is produced with the help of _ yeast _.
(d) Cholera is caused by _ bacteria _.
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