Grade 8 Revision: Microorganisms : Friend and Foe

The gas released during the preparation of bread is _______.

The process of conversion of sugar into alcohol in the absence of oxygen is called

• Pasteurization

• Vaccination

• Fermentation

• Decomposition

Carrier of malaria causing protozoan is

• Female Anopheles mosquito

• Cockroach

• Housefly

• Butterfly

Who discovered vaccine for smallpox?

• Robert Koch

• Edward Jenner

• Louis Pasteur

• Alexander Fleming

Cholera is caused by

• Bacteria

• Protozoa

• Virus

• Fungi

The most common carrier of communicable diseases is

• Ant

• Housefly

• Dragonfly

• Spider

Plant diseases rust of wheat is caused by

• Bacteria

• Virus

• Fungi

• Protozoa

Female Aedes mosquito is the carrier of

• Corona virus

• Dengue virus

• Common cold virus

• Measles virus

Disease anthrax caused by

• Virus

• Bacteria

• Fungi

• None of these

Name the bacteria which promotes the formation of curd

• Rhizobium

• Cyanobacteria

• Lactobacillus

• Clostridium