Q. How do probiotics benefit human health?
-
A.
By enhancing the immune system
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B.
By causing infections
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C.
By increasing cholesterol levels
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D.
By reducing nutrient absorption
Solution
Probiotics are live microorganisms that provide health benefits by enhancing the immune system and maintaining gut health.
Correct Answer:
A
— By enhancing the immune system
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Q. What is the primary function of yeast in baking?
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A.
Fermentation to produce carbon dioxide
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B.
To add flavor
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C.
To preserve food
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D.
To thicken dough
Solution
Yeast ferments sugars in the dough, producing carbon dioxide that causes the dough to rise.
Correct Answer:
A
— Fermentation to produce carbon dioxide
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Q. What is the role of microbes in the nitrogen cycle?
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A.
They convert nitrogen gas into ammonia
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B.
They deplete nitrogen from the soil
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C.
They have no role
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D.
They only produce oxygen
Solution
Certain microbes, such as nitrogen-fixing bacteria, convert atmospheric nitrogen into ammonia, which is essential for plant growth.
Correct Answer:
A
— They convert nitrogen gas into ammonia
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Q. What is the significance of fermentation in food production?
-
A.
It preserves food and enhances flavor
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B.
It spoils food
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C.
It has no impact on food
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D.
It only produces alcohol
Solution
Fermentation is a metabolic process that preserves food, enhances flavor, and can produce beneficial compounds.
Correct Answer:
A
— It preserves food and enhances flavor
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Q. What role do microbes play in the human digestive system?
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A.
They produce vitamins and aid in digestion
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B.
They cause diseases
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C.
They have no effect
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D.
They only break down proteins
Solution
Microbes in the human gut help in the digestion of food and produce essential vitamins like B12 and K.
Correct Answer:
A
— They produce vitamins and aid in digestion
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Q. Which microbe is commonly used in the production of antibiotics?
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A.
Penicillium
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B.
Lactobacillus
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C.
Saccharomyces
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D.
Streptococcus
Solution
Penicillium is a fungus that produces penicillin, one of the first antibiotics used in medicine.
Correct Answer:
A
— Penicillium
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Q. Which of the following is a benefit of using microbes in bioremediation?
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A.
They can degrade pollutants
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B.
They increase pollution
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C.
They are harmful to humans
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D.
They have no effect on the environment
Solution
Microbes can break down and degrade environmental pollutants, making them useful in bioremediation efforts.
Correct Answer:
A
— They can degrade pollutants
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Q. Which of the following is a common use of microbes in agriculture?
-
A.
Biofertilizers to enhance soil fertility
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B.
Pesticides to kill beneficial insects
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C.
Herbicides to kill all plants
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D.
None of the above
Solution
Microbes are used as biofertilizers to improve soil fertility and promote plant growth.
Correct Answer:
A
— Biofertilizers to enhance soil fertility
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Q. Which type of bacteria is commonly used in yogurt production?
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A.
Lactobacillus
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B.
Escherichia coli
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C.
Staphylococcus
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D.
Bacillus cereus
Solution
Lactobacillus is a beneficial bacteria used in the fermentation process to produce yogurt.
Correct Answer:
A
— Lactobacillus
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