Question

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 __________.

NCERT Class VIII
Science - Main Course Book

Chapter 2. Microorganisms: Friend and Foe

Answer 1

microscope.
nitrogen.
yeast/anaerobic bacteria
vibrio cholerae

Answer 2

(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 Vibrio cholerae