MCQ Questions for Class 8 Science Chapter 2 Microorganisms: Friend and Foe

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Chapter 2 Class 8 Science MCQ Questions are prepared according to latest CBSE curriculum and allows students to learn faster and in a time-efficient manner. It will give students an opportunity to refresh their memory.

Chapter 2 Microorganisms: Friend and Foe Class 8 Science MCQ Questions

1. The bacterium that turns milk into curd is:
(a) lactobacillus
(b) acetobacter
(c) rhizobium
(d) none of these
▶ (a) lactobacillus

2. The process of conversion of sugar into alcohol is known as:
(a) pasteurisation
(b) fermentation
(c) decomposition
(d) none of these
▶ (b) fermentation

3. A common preservative used in jam and pickles is
(a) Sodium benzoate
(b) Nitric acid
(c) Sodium Chloride
(d) Copper Sulphate
▶ (a) Sodium benzoate

4. The bacteria was first observed by:
(a) Louis Pasteur
(b) Antony Von Leuwen Hook
(c) Robert Hooke
(d) Robert Koch
▶ (b) Antony Von Leuwen Hook

5. Examples of Multicellular Microorganism are
(a) Algae, Bacteria
(b) Bacteria and Fungi
(c) Bacteria and Viruses
(d) Algae and Fungi
▶ (d) Algae and Fungi

6. Protozoan shaped like a slipper is:
(a) amoeba
(b) paramecium
(c) euglena
(d) entamoeba
▶ (b) paramecium

7. Malaria is spread by:
(a) plasmodium
(b) female anapheles mosquito
(c) male anapheles mosquito
(d) none of these
▶ (b) female anapheles mosquito

8. Atmospheric nitrogen is used for the synthesis of:
(a) plant proteins
(b) animal proteins
(c) plant carbohydrates
(d) none of these
▶ (a) plant proteins

9. Diseases like polio and chicken pox are caused by
(a) Bacteria
(b) Fungi
(c) Virus
(d) Worms
▶ (c) Virus

10. Which of the following is a preservative?
(a) sodium benzoate
(b) common salt
(c) vinegar
(d) all of these
▶ (d) all of these

11. The bread or dosa dough rises because of the action of:
(a) heat
(b) grinding
(c) growth of yeast cells
(d) none of these
▶ (c) growth of yeast cells

12. Which of the following drug is an antibiotic?
(a) alcohol
(b) insulin
(c) streptomycin
(d) none of these
▶ (c) streptomycin

13. The pores in the bread is due to gas bubbles of
(a) Oxygen
(b) Nitrogen di oxide
(c) Nitrogen
(d) Carbon di oxide
▶ (d) Carbon di oxide

14. The algae commonly used as fertilisers are called:
(a) chlorellin
(b) blue-green algae
(c) spirogyra
(d) none of these
▶ (b) blue-green algae

15. A group of micro organisms that have the characters of both living and non-living are:
(a) bacteria
(b) protozoa
(c) virus
(d) fungi
▶ (c) virus

16. Yeast helps in the production of:
(a) sugar
(b) alcohol
(c) oxygen
(d) none of these
▶ (b) alcohol

17. Deliberately injecting weak microbes into a healthy body and producing antibodies to fight against strong microbes is called
(a) Medication
(b) Antibiotics
(c) Vaccination
(d) All of these
▶ (c) Vaccination

18. Scientist who discovered fermentation is
(a) Louis pasteur
(b) Alexander fleming
(c) John mendal
(d) Edward jenner
▶ (a) Louis pasteur

19. Vaccine for small pox is discovered by
(a) Edward jenner
(b) Louis pasteur
(c) Alexander fleming
(d) John mendal
▶ (a) Edward jenner

20. Breathing in polluted air causes:
(a) kidney trouble
(b) heart problem
(c) respiratory diseases
(d) none of these
▶ (c) respiratory diseases

21. What helps in the rise of bread or dosa dough?
(a) Heat
(b) Grinding
(c) Growth of yeast cells
(d) Low pressure
▶ (c) Growth of yeast cells

22. Which of the following enzymes is secreted by bacteria that can digest cellulose?
(a) Amylase
(b) Cellulase
(c) Lipase
(d) Protease
▶ (b) Cellulase

23. Virus reproduce:
(a) only outside the cells of the host organisms
(b) only inside the cells of the host organisms
(c) both inside and outside the cells of the host organisms
(d) none of these
▶ (b) only inside the cells of the host organisms

24. What process takes place when yeast is added to grape juice and left for a week?
(a) Decomposition
(b) Fermentation
(c) Distillation
(d) Oxidation
▶ (b) Fermentation

25. Which of the following is air-borne disease:
(a) typhoid
(b) tuberculosis
(c) cholera
(d) polio
▶ (c) cholera