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Microorganisms and their Roles MCQs with Answers

Microorganisms and their Roles MCQs

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

Answer
c) Fungi

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

Answer
b) They fix atmospheric nitrogen into forms usable by plants

Which microorganism is commonly used in the production of yogurt?
a) Bacteria
b) Viruses
c) Algae
d) Protozoa

Answer
a) Bacteria

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

Answer
b) They decompose dead organisms and recycle nutrients

Which microorganism is essential for the production of antibiotics like penicillin?
a) Bacteria
b) Fungi
c) Algae
d) Viruses

Answer
b) Fungi

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

Answer
a) They assist in breaking down complex carbohydrates and proteins

Which microorganism is known for causing diseases like malaria?
a) Bacteria
b) Fungi
c) Protozoa
d) Viruses

Answer
c) Protozoa

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

Answer
a) Fermentation of sugars to produce alcohol and carbon dioxide

Which microorganisms are used in the bioremediation of oil spills?
a) Bacteria
b) Viruses
c) Fungi
d) Algae

Answer
a) Bacteria

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

Answer
a) Nitrogen fixation and oxygen production through photosynthesis

Which microorganism is used to make vinegar?
a) Bacteria
b) Fungi
c) Algae
d) Protozoa

Answer
a) Bacteria

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

Answer
a) They support digestion and maintain a healthy gut microbiota

Which microorganism is used in the production of cheese?
a) Bacteria
b) Viruses
c) Protozoa
d) Algae

Answer
a) Bacteria

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

Answer
a) Decomposing organic matter into humus

Which microorganism is a common cause of food poisoning?
a) Bacteria
b) Fungi
c) Algae
d) Protozoa

Answer
a) Bacteria

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

Answer
a) They convert nitrogen from the atmosphere into forms usable by plants

Which microorganism is used in the production of sourdough bread?
a) Yeast
b) Bacteria
c) Viruses
d) Fungi

Answer
b) Bacteria

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

Answer
a) Breaking down organic pollutants and purifying water

Which microorganism is responsible for the disease tuberculosis?
a) Bacteria
b) Fungi
c) Viruses
d) Protozoa

Answer
a) Bacteria

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

Answer
a) Decomposing organic matter to produce bioethanol or biodiesel

Which microorganism is used in the production of soy sauce?
a) Fungi
b) Bacteria
c) Viruses
d) Algae

Answer
a) Fungi

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

Answer
a) They help decompose organic matter and improve soil fertility

Which microorganism is involved in the production of antibiotics such as penicillin?
a) Fungi
b) Bacteria
c) Algae
d) Protozoa

Answer
a) Fungi

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

Answer
a) They help break down complex carbohydrates and synthesize vitamins

Which microorganism is used in the production of antibiotics like streptomycin?
a) Bacteria
b) Fungi
c) Algae
d) Viruses

Answer
a) Bacteria

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

Answer
a) They decompose organic matter and release carbon dioxide into the atmosphere

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

Answer
a) Mycorrhizal fungi

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

Answer
a) They ferment sugars and produce flavor compounds

Which microorganism is involved in the production of antibiotics like tetracycline?
a) Bacteria
b) Fungi
c) Algae
d) Viruses

Answer
a) Bacteria

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

Answer
a) Fermenting sugars to produce ethanol

Which microorganisms are commonly used in the production of fermented beverages like wine?
a) Yeast
b) Bacteria
c) Viruses
d) Algae

Answer
a) Yeast

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

Answer
a) They break down environmental pollutants into less harmful substances

Which microorganism is known for causing athlete’s foot?
a) Fungi
b) Bacteria
c) Viruses
d) Protozoa

Answer
a) Fungi

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

Answer
a) They convert nitrogen from the atmosphere into forms usable by plants

Which microorganism is commonly used in the production of antibiotics like vancomycin?
a) Bacteria
b) Fungi
c) Algae
d) Viruses

Answer
b) Fungi

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

Answer
a) They decompose organic matter to form humus

Which microorganism is used in the production of bioethanol from plant materials?
a) Yeast
b) Bacteria
c) Fungi
d) Algae

Answer
a) Yeast

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

Answer
a) They ferment ethanol into acetic acid

Which microorganisms are involved in the fermentation process of sauerkraut?
a) Lactic acid bacteria
b) Yeast
c) Algae
d) Protozoa

Answer
a) Lactic acid bacteria

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

Answer
a) Yeast ferments sugars to produce carbon dioxide and cause the dough to rise

Which microorganism is commonly involved in the production of sauerkraut?
a) Lactic acid bacteria
b) Yeast
c) Bacteria
d) Viruses

Answer
a) Lactic acid bacteria

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

Answer
a) They break down organic waste and purify the water

Which microorganism is commonly used in the production of antibiotics like neomycin?
a) Bacteria
b) Fungi
c) Algae
d) Protozoa

Answer
a) Bacteria

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

Answer
a) They ferment soybeans and produce flavor compounds

Which microorganism is used in the production of kombucha?
a) Yeast and bacteria
b) Algae
c) Protozoa
d) Viruses

Answer
a) Yeast and bacteria

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

Answer
a) They break down plant material and recycle nutrients back into the ecosystem

If you are interested to enhance your knowledge regarding PhysicsChemistryComputer, and Biology please click on the link of each category, you will be redirected to dedicated website for each category.

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See Also  Health and Nutrition MCQs with Answers
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