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Class 8 Practice – Level 2 – Set 1 – Microorganisms
Total questions: 25
1.
Which of the following statements about viruses is true?
They can reproduce on their own.
They are made up of living cells.
They require a host cell to reproduce.
They can be killed by antibiotics.
None
2.
Which of the following microorganisms is used in the production of antibiotics?
Yeast
Fungi
Algae
Bacteria
None
3.
Which of the following is a feature of bacteria?
They have a nucleus.
They are unicellular.
They are always harmful.
They can be seen with the naked eye.
None
4.
What is the role of bacteria in the nitrogen cycle?
They decompose organic matter.
They fix atmospheric nitrogen.
They produce oxygen.
They consume carbon dioxide.
None
5.
Lactobacillus is a type of bacteria used in the dairy industry. What is its primary role?
To spoil milk
To produce antibiotics
To ferment lactose into lactic acid
To decompose organic matter
None
6.
Which microorganism is responsible for causing cholera?
Bacteria
Virus
Fungus
Protozoa
None
7.
Malaria is transmitted to humans by which organism?
Mosquito
Fly
Tick
Flea
None
8.
Which of the following diseases is caused by a bacterium and not by a virus?
Influenza
Chickenpox
Typhoid
Measles
None
9.
What is the function of antibiotics?
To increase microbial growth
To kill or inhibit the growth of bacteria
To promote fermentation
To enhance food preservation
None
10.
Which of the following is a common method of preventing bacterial infections?
Washing hands regularly
Avoiding fruits and vegetables
Drinking unboiled water
Keeping food at room temperature
None
11.
Which microorganism is used in the fermentation of dough to make it rise?
Bacteria
Fungi
Virus
Protozoa
None
12.
Which of the following processes is an example of using microorganisms in biotechnology?
Vaccination
Soil fertilization
Food preservation
All of the above
None
13.
Which of the following microorganisms can be used to produce biofuels?
Yeast
Bacteria
Algae
All of the above
None
14.
What is the role of decomposers in an ecosystem?
To produce food
To fix nitrogen
To break down dead organic matter
To cause diseases
None
15.
Which of the following is a beneficial effect of bacteria in the human gut?
Causing diseases
Producing vitamins
Spoiling food
None of the above
None
16.
What method of food preservation uses high temperatures to kill microorganisms?
Fermentation
Refrigeration
Pasteurization
Freezing
None
17.
Which of the following methods is used for long-term food preservation?
Boiling
Canning
Freezing
Both canning and freezing
None
18.
What is the primary purpose of salting food?
To add flavor
To enhance texture
To inhibit the growth of microorganisms
To change color
None
19.
Which food preservation technique involves removing moisture from food?
Canning
Dehydration
Freezing
Fermentation
None
20.
Which of the following is a disadvantage of using preservatives in food?
They enhance flavor.
They can cause allergic reactions.
They increase shelf life.
They prevent spoilage.
None
21.
Which microorganism plays a key role in the decomposition of organic matter?
Fungi
Virus
Algae
Protozoa
None
22.
What is the primary role of nitrogen-fixing bacteria in agriculture?
To cause diseases in plants
To convert atmospheric nitrogen into a usable form for plants
To decompose organic matter
To produce food
None
23.
Which of the following is a method used to study microorganisms?
Microscopy
Spectroscopy
Chromatography
All of the above
None
24.
Which of the following is an important characteristic of fungi?
They are autotrophic.
They reproduce by binary fission.
They absorb nutrients from their surroundings.
They have chlorophyll.
None
25.
Which group of microorganisms can perform photosynthesis?
Bacteria
Fungi
Algae
Virus
None
1 out of 25
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