NCERT solution for class 8 // Science // Chapter 2 -- Microorganisms- friend or foe
NCERT solutions > class 8 > science NCERT solution for class 8 // Science // Chapter 2 -- Microorganisms- friend or foe Chapter 2 -- Microorganisms- friend or foe Q1. Fill in the blanks. 1. Microorganisms can be seen with help of a microscope. 2. Blue green algae fix nitrogen directly from air and enhance fertility of soil. 3. Alcohol is produced with the help of yeast. 4. Cholera is caused by bacteria Q2. Tick the correct answer. a) Yeast is used in production of i) Sugar ii) Alcohol. iii) Hydrochloric acid. iv) Oxygen b ) The following is an antibiotic. i ) Sodium bicarbonate. ii ) Streptomycin. iii) Alcohol iv ) Yeast c) Carrier of malaria causing protozoan is i) Female anopheles mosquito. ii) Cockroach iii) Housefly. iv) Butterfly. d) The most common carrier of communicable disease is. i) Ant ii) House fly iii ) Dragonfly iv) Spid...