Grade 8 CBSE Microorganisms science – test 1

1. Which microbe requires an animal, plant or bacterial host cell to reproduce?
A. Bacteria            B. Fungi          C. Virus           D. Algae

2. Which set of diseases is caused by viruses?
A. Polio, Common cold, Malaria, Typhoid               B. Influenza, Polio, Common Cold, Chicken pox
C. Common Cold, Influenza, Tuberculosis, Chicken pox
D. Cholera, Common cold, Chicken pox, Polio

3. Which microorganism and its causative agents are incorrectly paired?
A. Virus: Chicken Pox and Polio                          B. Bacteria: Cholera and Tuberculosis
C. Protozoa: Malaria and Amoebic Dysentery  D. Fungi: Measles and Ringworm

4. The rising of dough when yeast is added is because of ?
A. Carbon dioxide         B. Sulphur dioxide             C. Carbon monoxide            D. Di-hydrogen oxide

5. Which microorganism is responsible for turning milk into curd?
A. Vibrio cholera          B. Lactobacillus             C. Cyanobacteria                      D. Rhizobium

Type  A/B/C/D in each blank
1.
2.
3.
4.
5.

6. One of these pairs is not a fungal microorganism:
A. Penicillium and Paramecium           B. Aspergillus and Yeast
C. Bread mould and Yeast                    D. Aspergillus and Penicillium

7. Which pair is incorrectly matched with the type of microorganism?
A. Fungi: Yeast and Bread mould                       B. Algae: Spirogyra and Chlamydomonas
C. Bacteria: Salmonella and Cyanobacteria     D. Protozoa: Amoeba and Paramecium

8. Which pair of organisms improves soil fertility by fixing atmospheric nitrogen?
A. Rhizobium and Lactobacillus                      B. Cyanobacteria and Aspergillus
C. Penicillium and Rhizobium                          D. Cyanobacteria and Rhizobium

9. What are medicines that kill disease causing microbes called?
A. Antibodies             B. Antibiotics               C. Vaccines         D. Antiviral

10. Which of these fight against disease causing invaders that enter the body?
A. Antibodies          B. Antibiotics             C. Vaccines          D. Antiviral

Type  A/B/C/D in each blank
6.
7.
8.
9.
10.

11. Dead or weakened disease-causing microbes are introduced to a body to create immunity against a particular disease is called:
A. Antibodies            B. Antibiotics            C. Vaccines               D. Antiviral

12. Why should we not take antibiotics unnecessarily or in wrong doses?
A. It can kill beneficial bacteria in the body         
B. It cannot kill viruses that cause common cold or flu
C. It may become ineffective to fight bacterial diseases in the future
D. All of the above

13. Yeast is not used in the large scale production of
A. Alcohol and wine                      B. Bread and pastries 
C. Acetic acid and fruit juices      D. Vinegar or acetic acid

14. Antibiotics are produced from:
A. Algae and bacteria           B. Fungi and bacteria             C. Protozoa and algae         
D. Virus and fungi

15. Choose the incorrect statement:
A. Edward Jenner discovered the vaccine for smallpox in 1798
B. Louis Pasteur discovered fermentation in 1857
C. Robert Köch discovered the virus causing anthrax in 1876
D. Alexander Fleming discovered world’s first antibiotic Penicillin in 1929

Type  A/B/C/D in each blank
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12.
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15.

16. Which of the following is a correct set of antibiotics?
A. Streptomycin, Penicillin, Erythromycin, Tetracycline
B. Erythrocyte, Tuberculosis, Penicillin, Rhizobium
C. Penicillium, Aspergillus, Tetracycline, Streptomycin
D. Erythromycin, Aspergillus, Penicillin, Tuberculosis

17. Pick the odd one out of these statements:
A. Bacteria and Fungi are used to prepared fermented products like curd, cheese, alcohol, wine, acetic acid, idli-dosa, bread, bhatura and many more

B. Microbes clean the environment and improve soil fertility.

C. We can obtain chemicals from microbes that act as antibiotics and use dead or weakened microbes as vaccines

D. Microbes cause diseases in plants and animals that harm human beings

18. Which of these conditions are not needed for fermentation to occur:
A. Oxygen-rich atmosphere                                            B. Carbohydrates or simple sugars
C. Yeast or other bacteria such as Lactobacillus        D. Warm, dark and damp surrounding for a few hours

19. Which of these is the product of a fermentation process:
A. Oxygen and sugar                    B. Alcohol and carbon dioxide
C. Carbon dioxide and starch     D. Lactic acid and oxygen

20. Microorganisms can be seen with the help of a:
A. Stethoscope        B. Laryngoscope           C. Microscope         D. Baroscope

Type  A/B/C/D in each blank
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