NCERT Class 8 Science Chapter 2 Microorganisms: Friend and Foe Solutions
NCERT Class 8 Science Chapter 2 Microorganisms: Friend and Foe Solutions NCERT TEXT BOOK EXERCISES Q. 1. Fill in the blanks. (a) Microorganisms can be seen with the help of a __________. Ans. microscope. (b) Blue green algae fix _________ directly from air to enhance fertility of soil. Ans. atmospheric nitrogen. (c) Alcohol is produced with the help of _________. Ans. yeast. (d) Cholera is caused by _________. Ans. bacteria. Q. 2. Tick the correct answer: (i) Yeast is used in the production of: (a) sugar. (b) alcohol. (c) hydrochloric acid. (d) oxygen. Ans. (b) alcohol. (ii) The following is an antibiotic: (a) Sodium bicarbonate. (b) Streptomycin. (c) Alcohol. (d) Yeast. Ans. (b) Streptomycin. (iii) Carrier of malaria-causing protozoan is: (a) female Anopheles mosquito. (b) cockroach. (c) dragonfly. (d) butterfly. Ans. (a) female Anopheles mosquito. (iv) The most common carrier of communicable disease is: (a) ant. (b) housefly. (c) dragonfly. (d) spider. Ans. (b) housefly. (v) The brea...