Class 8 Science MCQ Chapter 2 Microorganisms: Friend or Foe Solutions in English Medium, Class 8 Science Multiple Choice Question Answer in English to each chapter is provided in the list so that you can easily browse throughout different chapters Class 8 Science MCQ Chapter 2 Microorganisms: Friend or Foe Notes and select need one.
Class 8 Science MCQ Chapter 2 Microorganisms: Friend or Foe
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Microorganisms: Friend or Foe
Chapter – 2
| MCQ |
1. Which of the following enzymes is secreted by bacteria that can digest cellulose?
(a) Amylase.
(b) Cellulase.
(c) Lipase.
(d) Protease.
Ans: (b) Cellulase.
2. Which of the following microorganism lives alone:
(a) Amoeba.
(b) All Bacteria.
(c) Fungi.
(d) All Cyanobacteria.
Ans: (a) Amoeba.
3. Which two words are synonyms?
(a) Microorganism and pathogen.
(b) Microorganism and microbe.
(c) Microbe and aerobe.
(d) Microbe and anaerobe.
Ans: (b) Microorganism and microbe.
4. Curd formations need:
(a) citric acid bacterium.
(b) acetic acid bacterium.
(c) lactic acid bacterium.
(d) all the above.
Ans: (c) lactic acid bacterium.
5. TMV causes disease in:
(a) tobacco plant.
(b) human infants.
(c) timber plants.
(d) none of the above.
Ans: (a) tobacco plant.
6. What are pond scum?
(a) algae.
(b) protozoa.
(c) fungi.
(d) bacteria.
Ans: (a) algae.
7. A plant disease called citrus canker is caused by a .
(a) Virus.
(b) Protozoa.
(c) Bacteria.
(d) Fungi.
Ans: (c) Bacteria.
8. Bacteriophage is a:
(a) fungi.
(b) protozoa.
(c) virus.
(d) bacteria.
Ans: (c) virus.
9. Which of the following statements describes bacteriophage correctly?
(a) It is a bacterium which causes diseases in plants.
(b) It is a type of virus which attacks bacteria.
(c) It is a bacterium which kills viruses.
(d) It can multiply inside both living and nonliving cells.
10. Which of the following disease causing pathogens is/are carried by mosquitoes?
(a) Dengue fever.
(b) Malaria.
(c) Cholera.
(d) Both (A) and (B).
Ans: (d) Both (A) and (B).
11. Which of the following terms is given to the microorganisms that cause diseases?
(a) Antigens.
(b) Antibodies.
(c) Pathogens.
(d) Vectors.
Ans: (c) Pathogens.
12. Malaria Is caused by:
(a) Protozoa.
(b) Virus.
(c) Algae.
(d) Bacteria.
Ans: (a) Protozoa.
13. Rhizobium bacteria-
(a) Help in nitrogen fixation.
(b) Help in digestion.
(c) Cause diseases.
(d) All of these.
Ans: (b) Help in digestion.
14. Scientist who discovered fermentation is:
(a) Louis pasteur.
(b) Alexander fleming.
(c) John mendel.
(d) Edward jenner.
Ans: (a) Louis pasteur.
15. Amoeba belongs to:
(a) Protozoa.
(b) Algae.
(c) Fungi.
(d) Virus.
Ans: (a) Protozoa.
16. Mushroom belongs to-
(a) Fungi.
(b) Algae.
(c) Virus.
(d) None of the options.
Ans: (a) Fungi.
17. Amount of nitrogen in the atmosphere is-
(a) 0.78
(b) 0.58
(c) 0.68
(d) 0.88
Ans: (a) 0.78
18. Vaccine for small pox is discovered by:
(a) Edward jenner.
(b) Louis pasteur.
(c) Alexander fleming.
(d) John mendal.
Ans: (a) Edward jenner.
19. Spirogyra is-
(a) A fungi.
(b) An algae.
(c) A protozoa.
(d) A bacteria.
Ans: (a) A fungi.
20. In Pasteurisation the milk is heated to about:
(a) 100°C
(b) 50°C
(c) 70°C
(d) 110°C
Ans: (c) 70°C
