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NEET • BIOLOGY • MICROBES IN HUMAN WELFARE
Microbes in human welfare practice · Easy
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31
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31 of 35
Remembering
+4 | -1
Which of the given is major component of biogas w.r.t. their relative contribution in it?
View answer and explanation
Correct option: A
Methane
Option A (Methane) is correct because methane is the primary and most abundant component of biogas.
Solution approach
- Correct Answer + Core Reason: Methane. Methane is the major component of biogas.
Step-by-Step Solution:
Step 1: Recall the composition of biogas. Biogas is a mixture of gases produced by anaerobic digestion of organic matter.
Step 2: Identify the major components. The major components of biogas are methane (CH4) and carbon dioxide (CO2), with methane being the most abundant.
Step 3: Conclusion: Methane is the major component of biogas.
Why other options are wrong:
- Option B: Carbon dioxide is a significant component, but less abundant than methane.
- Option C: Hydrogen is present in small amounts.
- Option D: Hydrogen sulfide is present in trace amounts and is often removed due to its corrosive nature.
Key Concepts:
- Biogas composition
- Methane
- Anaerobic digestion
Memory Aids:
- Biogas = Mostly Methane
Quick Tips:
- Methane is the key component that makes biogas a valuable fuel.
32
Easy
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Remembering
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Microbe used for biocontrol of pest butterfly caterpillars is
View answer and explanation
Correct option: B
Bacillus thuringiensis
Option B (Bacillus thuringiensis) is correct because Bacillus thuringiensis (Bt) produces toxins that specifically target and kill butterfly caterpillars, making it a biocontrol agent.
Solution approach
- Correct Answer + Core Reason: Bacillus thuringiensis. Bt produces toxins that are lethal to butterfly caterpillars.
Step-by-Step Solution:
Step 1: Recall the function of Bacillus thuringiensis (Bt).
Step 2: Identify its target pests, specifically butterfly caterpillars.
Step 3: Recognize its role as a biocontrol agent.
Step 4: Eliminate other options that are not effective against butterfly caterpillars.
Why other options are wrong:
- Option A: Saccharomyces cerevisiae is used in baking and brewing, not pest control.
- Option C: Streptococcus sp. is a bacteria, but not primarily used for insect biocontrol.
- Option D: Dragonfly is a predator of insects, but not a microbe.
Key Concepts:
- Biocontrol
- Bacillus thuringiensis (Bt)
- Insect pests
Memory Aids:
- Remember \"Bt\" for \"butterfly\" caterpillar control.
Quick Tips:
- Focus on the specific pests targeted by Bt.
33
Easy
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Understanding
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In a gobar gas plant, methogens convert
View answer and explanation
Correct option: C
Acetic acid into methane
The correct answer is C (Acetic acid into methane) because methanogens primarily convert acetic acid into methane in a gobar gas plant.
Solution approach
- Correct Answer + Core Reason: Acetic acid into methane. Methanogens convert acetic acid into methane.
Step-by-Step Solution:
Step 1: In a gobar gas plant, complex organic matter is broken down into simpler compounds through various microbial processes.
Step 2: Acetogenic bacteria convert these simpler compounds into acetic acid.
Step 3: Methanogens then convert acetic acid, as well as hydrogen and carbon dioxide, into methane (CH4).
Why other options are wrong:
- Option A: Complex insoluble polymers are initially broken down into simpler compounds, not directly into methane by methanogens.
- Option B: Complex soluble polymers are also first broken down into simpler compounds before methanogenesis.
- Option D: Simple insoluble polymers are not the primary substrate for methanogens; they are first converted into acetic acid.
Key Concepts:
- Methanogenesis
- Role of methanogens in biogas production
- Conversion of organic matter into methane
Memory Aids:
- Methanogens \"eat\" acetic acid and \"release\" methane.
Quick Tips:
- Understand the specific substrates and products of methanogenesis.
34
Easy
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Remembering
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How many of the following beverages are produced by distillation of the fermented broth?
Whisky, Wine, Rum, Brandy, Beer
Whisky, Wine, Rum, Brandy, Beer
View answer and explanation
Correct option: B
3
Option B (3) is correct because Whisky, Rum, and Brandy are produced by distillation, while Wine and Beer are produced by fermentation alone.
Solution approach
- Correct Answer + Core Reason: 3. Whisky, Rum, and Brandy are produced by distillation.
Step-by-Step Solution:
Step 1: Whisky is produced by distilling fermented grains.
Step 2: Rum is produced by distilling fermented sugarcane molasses or juice.
Step 3: Brandy is produced by distilling wine.
Step 4: Wine is produced by fermenting grapes (no distillation).
Step 5: Beer is produced by fermenting grains (no distillation).
Why other options are wrong:
- Option A: Wine and Beer are not distilled.
- Option C: Wine and Beer are not distilled.
- Option D: Wine and Beer are not distilled.
Key Concepts:
- Fermentation
- Distillation
- Alcoholic beverages
Memory Aids:
- Distillation concentrates alcohol.
Quick Tips:
- Understand the difference between fermentation and distillation.
35
Easy
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Understanding
+4 | -1
Producer gas differs from biogas in having
View answer and explanation
Correct option: B
Carbon monoxide
The correct answer is B (Carbon monoxide) because producer gas contains carbon monoxide, while biogas primarily consists of methane and carbon dioxide.
Solution approach
- Correct Answer + Core Reason: Carbon monoxide. Producer gas contains carbon monoxide, while biogas does not.
Step-by-Step Solution:
Step 1: Biogas is produced by the anaerobic digestion of organic matter and primarily consists of methane (CH4) and carbon dioxide (CO2).
Step 2: Producer gas is produced by the partial combustion of carbonaceous substances, such as coal or biomass, and contains carbon monoxide (CO), hydrogen (H2), and nitrogen (N2).
Step 3: The key difference is the presence of carbon monoxide in producer gas and its absence in biogas.
Why other options are wrong:
- Option A: Methane is a major component of biogas, not producer gas.
- Option C: Carbon dioxide is present in both biogas and producer gas.
- Option D: Both biogas and producer gas are formed through decomposition/gasification processes, but not necessarily through fermentation in the case of producer gas.
Key Concepts:
- Biogas composition and production
- Producer gas composition and production
- Differences between biogas and producer gas
Memory Aids:
- Producer gas \"produces\" CO (carbon monoxide).
Quick Tips:
- Know the specific components of different fuel gases.
Revision notes and key takeaways
Review MICROBES IN HUMAN WELFARE in your textbook or class notes, then use this set to check your understanding.
Showing 31-35 of 35 questions