Question

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 __________.​

Answer 1

1. microscope.
2. nitrogen
3. yeast
4. Vibrio cholerae