Welcome to the Microorganisms and their Roles MCQs with Answers. In this post, we are sharing Microorganisms and their Roles Multiple Choice Questions and Answers in Everyday Science section for various competitive exams in Pakistan. Each question offers a chance to enhance your knowledge regarding Microorganisms and their Roles online MCQs Test.
Which type of microorganism is responsible for fermentation in bread making?
a) Bacteria
b) Viruses
c) Fungi
d) Protozoa
What role do nitrogen-fixing bacteria play in agriculture?
a) They decompose organic matter
b) They fix atmospheric nitrogen into forms usable by plants
c) They cause plant diseases
d) They produce antibiotics
Which microorganism is commonly used in the production of yogurt?
a) Bacteria
b) Viruses
c) Algae
d) Protozoa
What is the primary role of decomposer microorganisms in an ecosystem?
a) They produce oxygen
b) They decompose dead organisms and recycle nutrients
c) They cause diseases
d) They enhance photosynthesis
Which microorganism is essential for the production of antibiotics like penicillin?
a) Bacteria
b) Fungi
c) Algae
d) Viruses
What role do microorganisms play in the digestion of food in ruminants?
a) They assist in breaking down complex carbohydrates and proteins
b) They produce harmful toxins
c) They inhibit digestion
d) They convert food into energy directly
Which microorganism is known for causing diseases like malaria?
a) Bacteria
b) Fungi
c) Protozoa
d) Viruses
What is the role of yeast in brewing beer?
a) Fermentation of sugars to produce alcohol and carbon dioxide
b) Decomposition of organic matter
c) Pathogen inhibition
d) Oxygen production
Which microorganisms are used in the bioremediation of oil spills?
a) Bacteria
b) Viruses
c) Fungi
d) Algae
What is the role of cyanobacteria in the environment?
a) Nitrogen fixation and oxygen production through photosynthesis
b) Decomposition of organic materials
c) Disease causation
d) Fermentation of sugars
Which microorganism is used to make vinegar?
a) Bacteria
b) Fungi
c) Algae
d) Protozoa
What is the role of probiotics in human health?
a) They support digestion and maintain a healthy gut microbiota
b) They cause infections
c) They produce antibiotics
d) They decompose organic matter
Which microorganism is used in the production of cheese?
a) Bacteria
b) Viruses
c) Protozoa
d) Algae
What is the role of microorganisms in composting?
a) Decomposing organic matter into humus
b) Producing harmful toxins
c) Enhancing photosynthesis
d) Increasing soil erosion
Which microorganism is a common cause of food poisoning?
a) Bacteria
b) Fungi
c) Algae
d) Protozoa
What role do bacteria play in the nitrogen cycle?
a) They convert nitrogen from the atmosphere into forms usable by plants
b) They cause plant diseases
c) They inhibit nutrient recycling
d) They decompose organic matter
Which microorganism is used in the production of sourdough bread?
a) Yeast
b) Bacteria
c) Viruses
d) Fungi
What role do microorganisms play in sewage treatment?
a) Breaking down organic pollutants and purifying water
b) Causing diseases
c) Producing toxins
d) Enhancing nutrient absorption
Which microorganism is responsible for the disease tuberculosis?
a) Bacteria
b) Fungi
c) Viruses
d) Protozoa
What is the role of microorganisms in the production of biofuels?
a) Decomposing organic matter to produce bioethanol or biodiesel
b) Causing environmental pollution
c) Producing toxins
d) Enhancing photosynthesis
Which microorganism is used in the production of soy sauce?
a) Fungi
b) Bacteria
c) Viruses
d) Algae
What role do microorganisms play in the health of soil?
a) They help decompose organic matter and improve soil fertility
b) They cause soil erosion
c) They inhibit plant growth
d) They produce harmful chemicals
Which microorganism is involved in the production of antibiotics such as penicillin?
a) Fungi
b) Bacteria
c) Algae
d) Protozoa
What role do microorganisms play in human digestion?
a) They help break down complex carbohydrates and synthesize vitamins
b) They cause infections
c) They inhibit digestion
d) They convert food into energy directly
Which microorganism is used in the production of antibiotics like streptomycin?
a) Bacteria
b) Fungi
c) Algae
d) Viruses
What is the role of microorganisms in the carbon cycle?
a) They decompose organic matter and release carbon dioxide into the atmosphere
b) They fix nitrogen into the soil
c) They enhance photosynthesis
d) They produce oxygen
Which microorganisms are known to form symbiotic relationships with plant roots to aid in nutrient absorption?
a) Mycorrhizal fungi
b) Viruses
c) Algae
d) Protozoa
What role do microorganisms play in the production of fermented foods like kimchi?
a) They ferment sugars and produce flavor compounds
b) They decompose organic matter
c) They inhibit fermentation
d) They cause spoilage
Which microorganism is involved in the production of antibiotics like tetracycline?
a) Bacteria
b) Fungi
c) Algae
d) Viruses
What role do microorganisms play in the production of bioethanol?
a) Fermenting sugars to produce ethanol
b) Decomposing organic matter
c) Causing diseases
d) Enhancing photosynthesis
Which microorganisms are commonly used in the production of fermented beverages like wine?
a) Yeast
b) Bacteria
c) Viruses
d) Algae
What is the role of microorganisms in bioremediation?
a) They break down environmental pollutants into less harmful substances
b) They cause contamination
c) They enhance soil erosion
d) They produce toxins
Which microorganism is known for causing athlete’s foot?
a) Fungi
b) Bacteria
c) Viruses
d) Protozoa
What role do microorganisms play in the nitrogen cycle?
a) They convert nitrogen from the atmosphere into forms usable by plants
b) They enhance plant growth directly
c) They produce oxygen
d) They cause soil erosion
Which microorganism is commonly used in the production of antibiotics like vancomycin?
a) Bacteria
b) Fungi
c) Algae
d) Viruses
What is the role of microorganisms in the formation of soil humus?
a) They decompose organic matter to form humus
b) They cause soil degradation
c) They enhance soil erosion
d) They inhibit nutrient absorption
Which microorganism is used in the production of bioethanol from plant materials?
a) Yeast
b) Bacteria
c) Fungi
d) Algae
What role do microorganisms play in the production of vinegar?
a) They ferment ethanol into acetic acid
b) They decompose organic matter
c) They inhibit fermentation
d) They produce toxins
Which microorganisms are involved in the fermentation process of sauerkraut?
a) Lactic acid bacteria
b) Yeast
c) Algae
d) Protozoa
What role do microorganisms play in the production of bread dough?
a) Yeast ferments sugars to produce carbon dioxide and cause the dough to rise
b) Bacteria break down gluten
c) Fungi decompose the dough
d) Protozoa enhance flavor
Which microorganism is commonly involved in the production of sauerkraut?
a) Lactic acid bacteria
b) Yeast
c) Bacteria
d) Viruses
What role do microorganisms play in wastewater treatment?
a) They break down organic waste and purify the water
b) They produce harmful substances
c) They inhibit decomposition
d) They enhance nutrient absorption
Which microorganism is commonly used in the production of antibiotics like neomycin?
a) Bacteria
b) Fungi
c) Algae
d) Protozoa
What role do microorganisms play in the production of fermented foods like miso?
a) They ferment soybeans and produce flavor compounds
b) They decompose organic matter
c) They cause spoilage
d) They enhance photosynthesis
Which microorganism is used in the production of kombucha?
a) Yeast and bacteria
b) Algae
c) Protozoa
d) Viruses
What role do microorganisms play in the decomposition of plant material in forests?
a) They break down plant material and recycle nutrients back into the ecosystem
b) They inhibit decomposition
c) They enhance soil erosion
d) They cause plant diseases
If you are interested to enhance your knowledge regarding Physics, Chemistry, Computer, and Biology please click on the link of each category, you will be redirected to dedicated website for each category.
