CBSE Class 8 Science Microorganisms: Friend and Foe Quiz 3

1. Which bacteria helps in settling of curd?

A Rhizobium B Lactobacillus C Vibriocholarae D Bacillus

2. Which microorganism causes AIDS?

A A protozoa B A bacteria C A virus D An algae

3. Which of the following disease is spread due to bacteria?

A Tuberculosis B Measles C Chicken pox D Polio

4. Which of the following is not used as food preservatives?

A Salt B Sugar C Vinegar D Methane

5. The process by which amount of nitrogen remains the same in the atmosphere is known as

A fermentation B carbon cycle C nitrogen cycle D photosynthesis