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