Biology in Health - Microbes in Human Welfare
Q. What is the role of yeast in baking? (2022)
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A.
Fermentation
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B.
Decomposition
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C.
Photosynthesis
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D.
Respiration
Solution
Yeast ferments sugars to produce carbon dioxide, which helps the dough rise in baking.
Correct Answer: A — Fermentation
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Q. Which of the following is a beneficial role of bacteria in human welfare? (2019)
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A.
Causing diseases
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B.
Decomposing organic matter
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C.
Producing toxins
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D.
Inhibiting digestion
Solution
Bacteria play a crucial role in decomposing organic matter, which helps in nutrient cycling.
Correct Answer: B — Decomposing organic matter
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Q. Which of the following is a beneficial role of microbes in human welfare? (2019)
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A.
Causing diseases
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B.
Decomposing organic matter
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C.
Producing toxins
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D.
Inhibiting digestion
Solution
Microbes play a crucial role in decomposing organic matter, which helps in nutrient cycling in ecosystems.
Correct Answer: B — Decomposing organic matter
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Q. Which of the following is a characteristic of pathogenic microbes? (2019)
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A.
They are always beneficial
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B.
They can cause diseases
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C.
They are used in food production
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D.
They are harmless
Solution
Pathogenic microbes are those that can cause diseases in humans, animals, or plants.
Correct Answer: B — They can cause diseases
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Q. Which of the following is a characteristic of probiotics? (2022)
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A.
They are harmful bacteria
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B.
They promote gut health
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C.
They cause infections
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D.
They are not found in food
Solution
Probiotics are beneficial bacteria that promote gut health and are often found in fermented foods.
Correct Answer: B — They promote gut health
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Q. Which of the following is a common use of probiotics? (2023)
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A.
To treat infections
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B.
To improve gut health
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C.
To cause diseases
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D.
To produce antibiotics
Solution
Probiotics are beneficial bacteria that help improve gut health and can prevent infections.
Correct Answer: B — To improve gut health
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Q. Which of the following is a common use of yeast in food production? (2019)
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A.
Making cheese
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B.
Making bread
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C.
Making vinegar
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D.
Making yogurt
Solution
Yeast is commonly used in bread making due to its ability to ferment sugars and produce carbon dioxide.
Correct Answer: B — Making bread
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Q. Which of the following is a disease caused by a virus? (2021)
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A.
Tuberculosis
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B.
Malaria
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C.
HIV/AIDS
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D.
Typhoid
Solution
HIV/AIDS is caused by the Human Immunodeficiency Virus (HIV), which is a virus.
Correct Answer: C — HIV/AIDS
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Q. Which of the following is a method of controlling microbial growth in food? (2022)
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A.
Refrigeration
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B.
Boiling
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C.
Canning
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D.
All of the above
Solution
All of the mentioned methods are effective in controlling microbial growth in food.
Correct Answer: D — All of the above
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Q. Which of the following is a method of using microbes for waste treatment? (2023)
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A.
Incineration
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B.
Composting
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C.
Landfilling
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D.
Chemical treatment
Solution
Composting utilizes microbes to decompose organic waste into nutrient-rich compost.
Correct Answer: B — Composting
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Q. Which of the following is a method of using microbes to clean up the environment? (2023)
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A.
Bioremediation
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B.
Vaccination
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C.
Pasteurization
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D.
Fermentation
Solution
Bioremediation is the process of using microbes to clean up contaminated environments.
Correct Answer: A — Bioremediation
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Q. Which of the following is a product of microbial fermentation? (2022)
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A.
Antibiotics
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B.
Vitamins
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C.
Alcohol
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D.
All of the above
Solution
Microbial fermentation can produce antibiotics, vitamins, and alcohol, among other products.
Correct Answer: D — All of the above
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Q. Which of the following is a role of microbes in agriculture? (2021)
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A.
Nitrogen fixation
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B.
Soil erosion
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C.
Pest infestation
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D.
Plant diseases
Solution
Microbes, particularly certain bacteria, play a vital role in nitrogen fixation, which is essential for plant growth.
Correct Answer: A — Nitrogen fixation
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Q. Which of the following is a role of yeast in human welfare? (2020)
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A.
Causing infections
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B.
Producing alcohol
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C.
Decomposing waste
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D.
None of the above
Solution
Yeast, particularly Saccharomyces cerevisiae, is used in the production of alcohol through fermentation.
Correct Answer: B — Producing alcohol
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Q. Which of the following is NOT a product of microbial fermentation? (2022)
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A.
Yogurt
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B.
Bread
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C.
Vinegar
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D.
Sugar
Solution
Sugar is not a product of microbial fermentation; it is a substrate that microbes ferment.
Correct Answer: D — Sugar
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Q. Which of the following is NOT a use of microbes in human welfare? (2023)
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A.
Bioremediation
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B.
Food production
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C.
Genetic engineering
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D.
Causing infections
Solution
Causing infections is not a beneficial use of microbes; it is a harmful effect.
Correct Answer: D — Causing infections
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Q. Which of the following microbes is commonly used in the fermentation of food? (2021)
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A.
Bacteria
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B.
Viruses
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C.
Fungi
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D.
All of the above
Solution
All of the mentioned microbes can be involved in fermentation processes, but bacteria and fungi are the most common.
Correct Answer: D — All of the above
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Q. Which of the following microbes is commonly used in the fermentation of yogurt? (2021)
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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 subtilis
Solution
Lactobacillus is the primary bacterium used in the fermentation process to produce yogurt.
Correct Answer: A — Lactobacillus
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Q. Which of the following microbes is used in the production of antibiotics? (2020)
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A.
Bacteria
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B.
Viruses
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C.
Fungi
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D.
Protozoa
Solution
Fungi, particularly the genus Penicillium, are used in the production of antibiotics like penicillin.
Correct Answer: C — Fungi
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Q. Which of the following microbes is used in the production of biofuels? (2023)
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A.
Bacteria
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B.
Viruses
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C.
Fungi
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D.
All of the above
Solution
Bacteria are commonly used in the production of biofuels through fermentation processes.
Correct Answer: A — Bacteria
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Q. Which of the following microbes is used in the production of yogurt? (2021)
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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 subtilis
Solution
Lactobacillus is the primary bacterium used in the fermentation of milk to produce yogurt.
Correct Answer: A — Lactobacillus
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