Microorganisms

Worksheet: Microorganisms

Name:Class:

Answer the questions.

1. Which of these is a single-celled living thing?
   a) Bacteriumb) Mossc) Mushroomd) Virus
2. Which of these can only reproduce inside a living host cell?
   a) Bacteriumb) Mouldc) Virusd) Yeast
3. Yeast, mushrooms and mould all belong to which group?
   a) Bacteriab) Fungic) Plantsd) Viruses
4. Which microorganism makes bread dough rise?
   a) Algaeb) Flu virusc) Salmonellad) Yeast
5. What gas made by yeast forms bubbles in dough?
   a) Carbon dioxideb) Hydrogenc) Nitrogend) Oxygen
6. Yoghurt is made by adding helpful bacteria to milk.
   a) Trueb) False
7. Which disease is caused by a virus?
   a) Athlete's footb) Food poisoning from bacteriac) Influenza (flu)d) Tooth decay
8. Antibiotics are medicines that work well against viruses.
   a) Trueb) False
9. What is the best way to remove germs from your hands?
   a) Rinse with cold water onlyb) Shake them dryc) Wash with soap and waterd) Wipe on your clothes
10. What should you do when you sneeze to stop germs spreading?
    a) Hold your breathb) Sneeze into a tissue or elbowc) Sneeze into your open handd) Sneeze towards a friend
11. Why is food kept in a fridge?
    a) Cold feeds the microbesb) Cold kills all microbes instantlyc) Cold makes microbes helpfuld) Cold slows the growth of microbes
12. What do decomposers do to dead plants and animals?
    a) Break them downb) Keep them freshc) Make them growd) Turn them into rock
13. Decomposers return nutrients to the soil.
    a) Trueb) False
14. Name one type of microorganism that is a decomposer.
15. What do we call microbes that cause disease?
16. What is the name of the tool that makes tiny microbes look bigger?