Microbes in Human Welfare

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CBSE Learning Objectives – Key Concepts & Skills You Must Know

Learning Objectives

Identify the role of microbes in household products.
Discuss the importance of microbes in industrial products.
Explain the process of sewage treatment using microbes.
Describe the production of biogas and its significance.
Analyze the use of microbes as biocontrol agents in agriculture.
Evaluate the benefits of biofertilisers in soil fertility.

CBSE Revision Notes & Quick Summary for Last-Minute Study

Microbes in Human Welfare

8.1 Microbes in Household Products

Microbes are used in everyday products, such as curd from milk.
- Lactic Acid Bacteria (LAB): Convert milk to curd, improving nutritional quality by increasing vitamin B12.
- Fermentation: Used in making dough for foods like dosa and idli, producing CO₂ gas.

8.2 Microbes in Industrial Products

Microbes synthesize valuable products in industries, including beverages and antibiotics.
Industrial production requires large vessels called fermentors.

8.3 Microbes in Sewage Treatment

Microbes are used to treat sewage through activated sludge formation, recycling water in nature.

8.4 Microbes in Production of Biogas

Methanogens: Produce methane (biogas) while degrading plant waste, used as an energy source in rural areas.

8.5 Microbes as Biocontrol Agents

Biocontrol uses biological methods to manage pests and diseases, reducing reliance on harmful chemicals.

8.6 Microbes as Biofertilisers

Biofertilisers enrich soil nutrient quality, with sources including bacteria, fungi, and cyanobacteria.
- Rhizobium: Fixes atmospheric nitrogen in leguminous plants.
- Mycorrhiza: Fungi that enhance phosphorus absorption for plants.
- Cyanobacteria: Fix nitrogen and add organic matter to soil.

Summary

Microbes play a crucial role in human welfare, with applications in food production, industrial processes, sewage treatment, energy production, pest control, and soil enrichment.

CBSE Exam Tips, Important Questions & Common Mistakes to Avoid

Common Mistakes and Exam Tips

Common Pitfalls

Misunderstanding Microbial Roles: Students often confuse harmful microbes with beneficial ones. Remember that not all microbes are pathogenic; many play crucial roles in human welfare.
Neglecting the Importance of Biofertilisers: Many students overlook the significance of biofertilisers in agriculture, thinking only chemical fertilisers are effective. Understand the benefits of using organisms like Rhizobium and mycorrhizal fungi.
Confusing Sewage Treatment Processes: Be clear about the differences between primary and secondary sewage treatment. Mislabeling these processes can lead to incorrect answers.

Exam Tips

Focus on Applications: When studying microbes, emphasize their applications in daily life, such as in food production (e.g., curd, bread) and industrial processes (e.g., antibiotics, biogas).
Diagram Practice: Familiarize yourself with diagrams related to microbial processes, such as fermentation and sewage treatment plants, as they can be crucial for visual questions.
Understand Metabolic Processes: Be prepared to explain metabolic pathways, especially those leading to gas production in fermentation, as these are common exam questions.
Use Examples: When asked about the roles of microbes, use specific examples like Lactobacillus for curd or Saccharomyces cerevisiae for bread-making to illustrate your points.

CBSE Quiz & Practice Test – MCQs, True/False Questions with Solutions

Multiple Choice Questions

Absorbing phosphorus from soil

Fixing nitrogen

Producing ethanol

Generating biogas

Correct Answer: A

Solution:

Mycorrhiza, formed by fungi like Glomus, helps plants by absorbing phosphorus from the soil and passing it to the plant.

Producing antibiotics

Creating synthetic plastics

Manufacturing steel

Producing fossil fuels

Correct Answer: A

Solution:

Microbes are used to produce antibiotics, which are significant for treating diseases.

Clostridium butylicum

Aspergillus niger

Acetobacter aceti

Lactobacillus

Correct Answer: C

Solution:

Acetobacter aceti is a bacterium used for the production of acetic acid.

Saccharomyces cerevisiae

Lactobacillus

Acetobacter aceti

Aspergillus niger

Correct Answer: A

Solution:

Saccharomyces cerevisiae, also known as brewer's yeast, is used for fermenting malted cereals and fruit juices to produce ethanol.

Rhizobium with legumes

Azospirillum with cereals

Glomus forming mycorrhiza with the crops

Lactobacillus in the soil

Correct Answer: C

Solution:

Glomus forms mycorrhizal associations with plant roots, enhancing phosphorus uptake and providing other growth benefits.

Trichoderma polysporum

Monascus purpureus

Aspergillus niger

Clostridium butylicum

Correct Answer: A

Solution:

Cyclosporin A is produced by the fungus Trichoderma polysporum.

Distillation

Fermentation

Filtration

Pasteurization

Correct Answer: B

Solution:

Fermentation is the process where yeast converts sugars into ethanol and carbon dioxide. Optimizing fermentation conditions will maximize ethanol production.

Producing alcoholic beverages with extended shelf life

Enhancing the flavor of dairy products

Increasing the nutritional content of bread

Improving the texture of fermented vegetables

Correct Answer: A

Solution:

The yeast produces ethanol, which is typical for alcoholic beverages, and the byproduct inhibits bacterial growth, potentially extending the shelf life of these beverages.

Increased use of chemical fertilizers

Reduction in greenhouse gas emissions

Higher water consumption in agriculture

Decreased soil fertility

Correct Answer: B

Solution:

Biogas production from microbial activity helps in reducing greenhouse gas emissions by providing a renewable energy source.

Increased phosphorus uptake by plants

Higher nitrogen content in the soil

Improved resistance to fungal infections

Enhanced drought resistance

Correct Answer: B

Solution:

Cyanobacteria are known for their ability to fix atmospheric nitrogen, thereby enriching the nitrogen content of the soil.

Ethanol

Lactic acid

Acetic acid

Butyric acid

Correct Answer: A

Solution:

During the fermentation process in brewing beer, yeast primarily converts sugars into ethanol and carbon dioxide. Ethanol is the main alcoholic component of beer.

Increased atmospheric nitrogen fixation

Enhanced photosynthetic rate of plants

Improved drought resistance in plants

Increased resistance to insect pests

Correct Answer: A

Solution:

Cyanobacteria are known for their ability to fix atmospheric nitrogen, which can enrich the soil with nitrogen and improve plant growth, making them beneficial as biofertilizers.

Production of lactic acid

Increase in pH level

Production of ethanol

Formation of curd

Correct Answer: C

Solution:

Saccharomyces cerevisiae, commonly known as brewer's yeast, ferments sugars to produce ethanol, which would indicate successful fermentation.

Lactobacillus

Saccharomyces cerevisiae

Propionibacterium sharmanii

Aspergillus niger

Correct Answer: B

Solution:

Saccharomyces cerevisiae, also known as baker's yeast, is used in the fermentation of bread.

Rhizobium

Azospirillum

Nostoc

Trichoderma

Correct Answer: B

Solution:

Azospirillum is known for forming symbiotic relationships with non-leguminous plants and fixing atmospheric nitrogen, enhancing soil fertility.

To produce ethanol

To coagulate and partially digest milk proteins

To produce antibiotics

To ferment malted cereals

Correct Answer: B

Solution:

Lactic acid bacteria (LAB) grow in milk and produce acids that coagulate and partially digest the milk proteins, converting milk into curd.

Reduction in methane emissions

Decrease in water pollution

Production of renewable energy

Increase in agricultural yield

Correct Answer: C

Solution:

Biogas plants produce renewable energy by converting organic waste into methane, which can be used as a source of energy.

Fermentation of malted cereals

Distillation of fermented broth

Use of Saccharomyces cerevisiae

Fermentation of fruit juices

Correct Answer: B

Solution:

Non-distilled alcoholic drinks like wine and beer are produced without distillation, unlike whisky or rum.

Acetobacter aceti

Clostridium butylicum

Aspergillus niger

Lactobacillus

Correct Answer: C

Solution:

Aspergillus niger, a fungus, is used for the industrial production of citric acid.

Bacillus thuringiensis

Trichoderma species

Penicillium notatum

Streptococcus species

Correct Answer: A

Solution:

Bacillus thuringiensis is used as a microbial biocontrol agent to control butterfly caterpillars. It releases toxins that kill the caterpillar larvae.

Increased resistance to root-borne pathogens

Production of antibiotics

Fermentation of dairy products

Production of biogas

Correct Answer: A

Solution:

Mycorrhizal associations in plants, particularly with fungi like Glomus, increase resistance to root-borne pathogens, enhance tolerance to salinity and drought, and improve plant growth.

Testing its spectrum of activity against various bacteria

Increasing its concentration indefinitely

Using it indiscriminately for all infections

Combining it with any other antibiotic

Correct Answer: A

Solution:

Testing the antibiotic's spectrum of activity helps determine its effectiveness against specific bacterial strains.

Curd

Raw meat

Fresh fruit juice

Cooked rice

Correct Answer: A

Solution:

Curd is produced by the fermentation of milk by lactic acid bacteria (LAB), making it the most appropriate food sample for demonstrating the presence of LAB.

Production of antibiotics

Biocontrol agent against plant pathogens

Fermentation of dairy products

Biofertiliser for nitrogen fixation

Correct Answer: B

Solution:

Trichoderma species are effective biocontrol agents of several plant pathogens.

Trichoderma polysporum

Monascus purpureus

Streptococcus

Penicillium notatum

Correct Answer: A

Solution:

Trichoderma polysporum produces Cyclosporin A, a bioactive molecule used as an immunosuppressive agent in organ-transplant patients.

They produce antibiotics.

They fix atmospheric nitrogen into organic forms.

They decompose organic matter.

They produce ethanol.

Correct Answer: B

Solution:

Rhizobium bacteria form symbiotic associations with leguminous plants and fix atmospheric nitrogen into forms that plants can use as nutrients.

Ladybird beetles

Bacillus thuringiensis

Trichoderma species

Nucleopolyhedrovirus

Correct Answer: A

Solution:

Ladybird beetles are natural predators of aphids and are effective in controlling their populations in an organic farming system.

Fixation of atmospheric nitrogen

Increased phosphorus uptake

Addition of organic matter to the soil

Improvement of soil structure

Correct Answer: B

Solution:

Cyanobacteria primarily fix atmospheric nitrogen and add organic matter, but they do not directly increase phosphorus uptake.

Saccharomyces cerevisiae

Lactobacillus

Rhizobium

Penicillium notatum

Correct Answer: A

Solution:

Saccharomyces cerevisiae, also known as brewer's yeast, is used for fermenting malted cereals and fruit juices to produce ethanol.

Inadequate supply of cattle dung

Excessive use of chemical fertilizers in nearby fields

High ambient temperature

Presence of methanogenic bacteria

Correct Answer: A

Solution:

Cattle dung is a primary substrate for biogas production. Inadequate supply can lead to reduced methane production.

It is ripened by a specific fungus

It has large holes due to CO₂ production

It is made using brewer's yeast

It is fermented by Bacillus thuringiensis

Correct Answer: B

Solution:

The large holes in Swiss cheese are due to the production of a large amount of CO₂ by the bacterium Propionibacterium sharmanii.

Lactic acid fermentation

Alcoholic fermentation

Acetic acid fermentation

Butyric acid fermentation

Correct Answer: B

Solution:

The puffed-up appearance of dough used in making foods like dosa and idli is due to the production of CO₂ gas during alcoholic fermentation by bacteria.

Lactobacillus

Saccharomyces cerevisiae

Acetobacter aceti

Aspergillus niger

Correct Answer: B

Solution:

Saccharomyces cerevisiae, commonly called brewer's yeast, is used for fermenting malted cereals and fruit juices to produce ethanol.

Testing the antibiotic on viral infections

Determining the antibiotic's spectrum of activity

Increasing the antibiotic's production yield

Enhancing the antibiotic's flavor for oral consumption

Correct Answer: B

Solution:

Determining the spectrum of activity is crucial to understand which bacterial infections the antibiotic can effectively treat.

Rhizobium

Aspergillus niger

Penicillium notatum

Saccharomyces cerevisiae

Correct Answer: A

Solution:

Rhizobium forms symbiotic associations with leguminous plants and fixes atmospheric nitrogen into organic forms, enriching the soil.

They increase the use of chemical pesticides.

They help in eradicating all insects.

They reduce the need for toxic chemicals.

They promote the growth of weeds.

Correct Answer: C

Solution:

Biocontrol agents help reduce the dependence on toxic chemicals and pesticides in agriculture.

The pest population will increase due to resistance development.

Non-target beneficial insects will also be affected.

The pest population will decrease due to the toxin produced by Bt.

The soil nutrient content will be significantly altered.

Correct Answer: C

Solution:

Bt produces a toxin that specifically targets certain pest larvae, reducing their population without affecting non-target insects.

Testing its ability to inhibit bacterial growth in vitro

Determining its effect on viral replication

Assessing its impact on plant growth

Evaluating its ability to ferment sugars

Correct Answer: A

Solution:

To ensure the effectiveness of a new antibiotic in treating bacterial infections, it is crucial to test its ability to inhibit bacterial growth in vitro. This step helps determine its potential as an antibacterial agent.

Rhizobium

Azospirillum

Glomus

Saccharomyces cerevisiae

Correct Answer: C

Solution:

Glomus is a genus of fungi that forms mycorrhizal associations with plant roots, helping plants absorb phosphorus and providing resistance to salinity and drought, thus enhancing plant growth in saline soils.

Trichoderma

Bacillus thuringiensis

Azotobacter

Penicillium

Correct Answer: B

Solution:

Bacillus thuringiensis is a microbial biocontrol agent that produces toxins lethal to caterpillars, making it suitable for controlling caterpillar infestations.

Producing antibiotics

Fixing atmospheric nitrogen

Producing ethanol

Decomposing organic matter

Correct Answer: B

Solution:

Cyanobacteria, such as Anabaena and Nostoc, fix atmospheric nitrogen, enriching the soil in paddy fields.

Saccharomyces cerevisiae

Lactobacillus

Clostridium butylicum

Aspergillus niger

Correct Answer: A

Solution:

Saccharomyces cerevisiae, commonly known as brewer's yeast, is used for fermenting malted cereals and fruit juices to produce ethanol.

Propionibacterium sharmanii

Lactobacillus

Streptococcus

Bacillus thuringiensis

Correct Answer: A

Solution:

Propionibacterium sharmanii is known for producing large amounts of CO₂, which creates the characteristic holes in Swiss cheese.

Increases resistance to root-borne pathogens

Produces ethanol

Fixes atmospheric nitrogen

Produces antibiotics

Correct Answer: A

Solution:

Mycorrhiza, formed by fungi like Glomus, helps plants by increasing resistance to root-borne pathogens and improving nutrient uptake.

Rhizobium

Saccharomyces cerevisiae

Penicillium

Propionibacterium

Correct Answer: A

Solution:

Rhizobium forms symbiotic associations with leguminous plants to fix atmospheric nitrogen into organic forms.

Penicillium notatum

Aspergillus niger

Streptococcus

Monascus purpureus

Correct Answer: A

Solution:

Penicillium notatum is the mold from which the antibiotic Penicillin was first discovered.

Increased nitrogen fixation

Enhanced phosphorus uptake

Improved photosynthesis efficiency

Greater resistance to bacterial infections

Correct Answer: B

Solution:

Mycorrhizal fungi are known to enhance phosphorus uptake from the soil, which is a direct benefit for plant growth.

Lactobacillus

Saccharomyces cerevisiae

Propionibacterium sharmanii

Penicillium notatum

Correct Answer: C

Solution:

The large holes in Swiss cheese are due to the production of a large amount of CO₂ by Propionibacterium sharmanii.

Increased phosphorus availability in the soil

Enhanced nitrogen fixation in the soil

Improved resistance to fungal infections

Higher potassium content in the soil

Correct Answer: B

Solution:

Cyanobacteria are known for their ability to fix atmospheric nitrogen, thereby enriching the nitrogen content of the soil, which is a primary benefit for the farmer.

To convert milk into cheese

To convert milk into curd

To produce ethanol

To produce acetic acid

Correct Answer: B

Solution:

Lactic acid bacteria (LAB) convert milk into curd by producing acids that coagulate and partially digest milk proteins.

Methane (CH₄)

Carbon dioxide (CO₂)

Hydrogen sulfide (H₂S)

Nitrogen (N₂)

Correct Answer: A

Solution:

Biogas primarily consists of methane (CH₄) and carbon dioxide (CO₂), with methane being the major component produced by methanogens during the anaerobic digestion of organic matter such as cattle dung.

True or False

Correct Answer: True

Solution:

Cyanobacteria, such as Anabaena and Nostoc, are used as biofertilisers due to their ability to fix atmospheric nitrogen.

Correct Answer: True

Solution:

Biofertilisers consist of organisms like bacteria, fungi, and cyanobacteria that enrich the soil's nutrient quality, reducing the need for chemical fertilisers.

Correct Answer: False

Solution:

Biocontrol measures help reduce our dependence on toxic chemicals and pesticides.

Correct Answer: True

Solution:

Biofertilisers enrich the nutrient quality of the soil and can reduce dependence on chemical fertilisers.

Correct Answer: False

Solution:

Antibiotics are chemical substances produced by some microbes that can kill or retard the growth of other disease-causing microbes, not just bacteria, and are used to treat various infections.

Correct Answer: True

Solution:

Microbes are used to produce industrial products such as lactic acid, acetic acid, and alcohol.

Correct Answer: False

Solution:

Microbes are present in extreme environments such as deep inside geysers at temperatures as high as 100°C, under thick snow layers, and in highly acidic environments.

Correct Answer: False

Solution:

Penicillin was the first antibiotic discovered, but it was a chance discovery by Alexander Fleming.

Correct Answer: True

Solution:

Biogas plants are more often built in rural areas where cattle dung is available in large quantities.

Correct Answer: True

Solution:

Rhizobium bacteria form symbiotic relationships with leguminous plants, fixing atmospheric nitrogen into forms that the plant can use.

Correct Answer: False

Solution:

Cyanobacteria are autotrophic microbes that can fix atmospheric nitrogen in both aquatic and terrestrial environments.

Correct Answer: True

Solution:

Bacillus thuringiensis is used as a microbial biocontrol agent to control butterfly caterpillars by releasing toxins in the larvae's gut.

Correct Answer: False

Solution:

Biogas plants are often built in rural areas where cattle dung is available in large quantities.

Correct Answer: True

Solution:

Antibiotics are indeed chemical substances produced by some microbes to kill or retard the growth of other microbes.

Correct Answer: True

Solution:

Biofertilisers are organisms that enrich the nutrient quality of the soil, and the main sources include bacteria, fungi, and cyanobacteria.

Correct Answer: True

Solution:

Biofertilisers, which include bacteria, fungi, and cyanobacteria, enhance soil fertility by fixing atmospheric nitrogen and improving nutrient content.

Correct Answer: False

Solution:

The production of curd from milk involves micro-organisms such as Lactobacillus and other lactic acid bacteria (LAB), not yeast.

Correct Answer: False

Solution:

Not all microbes are pathogenic; many are beneficial to humans, such as those used in the production of antibiotics, fermented foods, and biofertilisers.

Correct Answer: True

Solution:

Biofertilisers like Rhizobium and cyanobacteria fix atmospheric nitrogen into forms usable by plants.

Correct Answer: False

Solution:

Microbes are present even at extreme sites such as deep inside geysers where the temperature may be as high as 100°C.

Correct Answer: False

Solution:

Antibiotics are chemical substances produced by microbes that kill or retard the growth of disease-causing microbes, thus benefiting human life.

Correct Answer: False

Solution:

Several microbes are useful to humans, such as those used in the production of curd, bread, and antibiotics.

Correct Answer: True

Solution:

Antibiotics are chemical substances produced by some microbes that can kill or retard the growth of disease-causing microbes.

Correct Answer: True

Solution:

Methanogens are microbes that produce methane (biogas) while degrading plant waste, which is used as an energy source.

Correct Answer: False

Solution:

Biocontrol measures help reduce the dependence on chemical pesticides but do not completely eliminate their need.

Correct Answer: True

Solution:

Microbes like bacteria and many fungi can be grown on nutritive media to form colonies that can be seen with the naked eyes.

Correct Answer: True

Solution:

Microbes are known to exist in extreme environments like thermal vents and under thick layers of snow, showcasing their adaptability.

Correct Answer: True

Solution:

Bread dough is fermented using baker's yeast, Saccharomyces cerevisiae.

Correct Answer: False

Solution:

While some antibiotics, like Penicillin, are derived from fungi, others are derived from bacteria.

Correct Answer: True

Solution:

Microbes, especially yeasts, are used for fermenting malted cereals and fruit juices to produce beverages like wine and beer.

Correct Answer: False

Solution:

The primary role of microbes like Lactobacillus in the production of curd is to convert milk into curd by producing acids that coagulate and partially digest milk proteins. Increasing vitamin B12 is an additional benefit.

Correct Answer: False

Solution:

Not all microbes are pathogenic; many are useful to humans in diverse ways, such as in food production and biocontrol.

Correct Answer: True

Solution:

Biogas plants are often built in rural areas where cattle dung is readily available, making it a viable source of energy.

Correct Answer: True

Solution:

Bacteria and fungi are indeed used to impart specific characteristics to cheese.

Correct Answer: False

Solution:

Biogas plants are more often built in rural areas where cattle dung is available in large quantities.

Correct Answer: False

Solution:

Not all microbes are harmful; many are beneficial and are used in various applications such as food production, medicine, and agriculture.

Correct Answer: False

Solution:

Biocontrol methods use biological means, such as natural predation, to control pests, reducing the need for toxic chemicals.

Correct Answer: True

Solution:

Trichoderma species are free-living fungi that are effective biocontrol agents of several plant pathogens.

Correct Answer: False

Solution:

Microbes are present everywhere, including in air, inside bodies, and in extreme environments.

Correct Answer: False

Solution:

Microbes are present even in extreme environments such as deep inside geysers, under snow, and in highly acidic environments.

Correct Answer: True

Solution:

Biocontrol agents, such as certain bacteria and fungi, are used to control pests and diseases, reducing the need for chemical pesticides.

Correct Answer: False

Solution:

Biogas plants are more often built in rural areas where cattle dung is available in large quantities.

Correct Answer: False

Solution:

Microbes are present even in extreme environments where no other life form could exist, such as deep inside geysers and highly acidic environments.

Correct Answer: True

Solution:

Bacillus thuringiensis produces toxins that specifically target and kill insect larvae, such as butterfly caterpillars, without affecting other insects.

Correct Answer: True

Solution:

The excerpt mentions that microbes are present in extreme conditions such as deep inside geysers where temperatures may be as high as 100°C and in highly acidic environments.

Correct Answer: True

Solution:

The excerpt explains that biofertilisers, such as bacteria, fungi, and cyanobacteria, enrich the nutrient quality of the soil by fixing atmospheric nitrogen and other processes.

Correct Answer: True

Solution:

The text mentions that wine and beer are produced by fermenting malted cereals and fruit juices with yeast, without distillation.

Microbes in Human Welfare

AI Learning Assistant

CBSE Learning Objectives – Key Concepts & Skills You Must Know

Learning Objectives

CBSE Revision Notes & Quick Summary for Last-Minute Study

Microbes in Human Welfare

8.1 Microbes in Household Products

8.2 Microbes in Industrial Products

8.3 Microbes in Sewage Treatment

8.4 Microbes in Production of Biogas

8.5 Microbes as Biocontrol Agents

8.6 Microbes as Biofertilisers

Summary

CBSE Exam Tips, Important Questions & Common Mistakes to Avoid

Common Mistakes and Exam Tips

Common Pitfalls

Exam Tips

Multiple Choice Questions

Q1.What is the role of mycorrhiza in plants?

Correct Answer: A

Q2.Which of the following is a common use of microbes in industrial products?

Correct Answer: A

Q3.Which microbe is used in the production of acetic acid?

Correct Answer: C

Q4.Which microbe is commonly used in the production of ethanol in industrial settings?

Correct Answer: A

Q5.A farmer wants to enhance the phosphorus uptake of his crops naturally. Which of the following microbial associations should he promote in his field?

Correct Answer: C

Q6.Which microbe is used to produce the immunosuppressive drug Cyclosporin A?

Correct Answer: A

Q7.A new fermented beverage is being developed using a novel yeast strain. This yeast is known to produce a higher concentration of ethanol than Saccharomyces cerevisiae. Which industrial process should be optimized to maximize ethanol production?

Correct Answer: B

Q8.A new strain of yeast is discovered that can ferment a novel fruit juice to produce ethanol. If this yeast also produces a byproduct that inhibits bacterial growth, which of the following could be a potential application of this yeast in the food industry?

Correct Answer: A

Q9.An environmental scientist is studying the impact of biogas plants in rural areas. Which of the following is a direct benefit of using biogas produced by microbes?

Correct Answer: B

Q10.A farmer is using a biofertilizer containing cyanobacteria in his rice fields. Which of the following benefits is he most likely to observe?

Correct Answer: B

Q11.A researcher is studying the metabolic pathways of yeast during the fermentation process. Which of the following is the primary product of yeast fermentation when brewing beer?

Correct Answer: A

Q12.A biotechnology company is developing a new biofertilizer using cyanobacteria. Which of the following benefits is most likely associated with the use of this biofertilizer in agriculture?

Correct Answer: A

Q13.In a laboratory experiment, a scientist uses Saccharomyces cerevisiae to ferment a novel fruit juice. Which of the following outcomes would indicate successful fermentation?

Correct Answer: C

Q14.Which microbe is commonly used in the fermentation process to produce bread?

Correct Answer: B

Q15.A researcher is studying a new strain of bacteria that can fix atmospheric nitrogen and form a symbiotic relationship with a non-leguminous plant. Which of the following genera is most likely to be involved in this symbiotic relationship?

Correct Answer: B

Q16.What is the primary role of lactic acid bacteria (LAB) in the production of curd?

Correct Answer: B

Q17.In an effort to reduce pollution, a city plans to implement biogas plants. Which of the following is a direct benefit of using biogas produced by microbes?

Correct Answer: C

Q18.In an industrial setup, a new beverage is being developed using yeast fermentation. If the goal is to produce a non-distilled alcoholic drink, which process should be avoided?

Correct Answer: B

Q19.Which microbe is used in the production of citric acid?

Correct Answer: C

Q20.In the context of biocontrol, which microbial agent is used to control butterfly caterpillars?

Correct Answer: A

Q21.Which of the following is a benefit of mycorrhizal associations in plants?

Correct Answer: A

Q22.A new antibiotic is derived from a fungus species. Which of the following steps would ensure its effectiveness in treating bacterial infections?

Correct Answer: A

Q23.In a laboratory experiment, a student is tasked with demonstrating the presence of lactic acid bacteria (LAB) in a food sample. Which food sample would be most appropriate for this demonstration?

Correct Answer: A

Q24.What is the role of Trichoderma species in agriculture?

Correct Answer: B

Q25.Which of the following microbes is used in the production of a bioactive molecule that acts as an immunosuppressive agent?

Correct Answer: A

Q26.What is the role of Rhizobium bacteria in agriculture?

Correct Answer: B

Q27.A farmer wants to control aphid populations in an organic farm without using chemical pesticides. Which biological control agent would be most effective?

Correct Answer: A

Q28.A scientist is developing a new biofertilizer using cyanobacteria. Which of the following benefits is least likely to be directly provided by this biofertilizer?

Correct Answer: B

Q29.Which of the following microbes is commonly used in the production of ethanol?

Correct Answer: A

Q30.A biogas plant in a rural area is facing issues with low methane production. Which of the following could be a potential reason?

Correct Answer: A

Q31.Which of the following is a characteristic feature of Swiss cheese?

Correct Answer: B