1. Microorganisms are organisms that:
A. Are very large
B. Can be seen with naked eye
C. Are too small to be seen without a microscope
D. Are plants only

2. Microorganisms are also called:
A. Macrobes
B. Microbes
C. Parasites
D. Germs only

3. Which instrument is used to see microorganisms?
A. Telescope
B. Microscope
C. Thermometer
D. Barometer

4. Which of the following is a microorganism?
A. Cow
B. Bacteria
C. Mango tree
D. Dog

5. Which of the following is NOT a group of microorganisms?
A. Bacteria
B. Fungi
C. Protozoa
D. Reptiles

6. Which microorganism causes malaria?
A. Virus
B. Protozoa
C. Bacteria
D. Fungi

7. The protozoan that causes malaria is:
A. Rhizobium
B. Lactobacillus
C. Plasmodium
D. Yeast

8. Which microorganism is used to make curd from milk?
A. Yeast
B. Lactobacillus
C. Rhizobium
D. Virus

9. Which microorganism is used in baking bread?
A. Yeast
B. Virus
C. Protozoa
D. Algae

10. Viruses can reproduce only inside:
A. Water
B. Air
C. Living cells
D. Soil

11. Which disease is caused by bacteria?
A. Cholera
B. Measles
C. Polio
D. Malaria

12. Which disease is caused by a virus?
A. Typhoid
B. Tuberculosis
C. Measles
D. Cholera

13. Tuberculosis is caused by:
A. Virus
B. Bacteria
C. Protozoa
D. Fungi

14. Which disease spreads through mosquito bites?
A. Malaria
B. Cholera
C. Typhoid
D. Measles

15. Microorganisms that cause disease are called:
A. Producers
B. Pathogens
C. Consumers
D. Decomposers

16. Citrus canker is a disease of:
A. Humans
B. Animals
C. Plants
D. Fish

17. Rust of wheat is caused by:
A. Bacteria
B. Fungi
C. Virus
D. Protozoa

18. Yellow vein mosaic disease affects:
A. Rice
B. Wheat
C. Bhindi (okra)
D. Cotton

19. Food poisoning is caused by:
A. Good bacteria
B. Harmful microorganisms
C. Minerals
D. Vitamins

20. Spoiled food usually shows:
A. Good smell
B. Bad smell
C. Sweet taste
D. Fresh color