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Biology · MICROBES IN HUMAN WELFARE
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Biology · MICROBES IN HUMAN WELFARE
Which of the following microorganisms is primarily responsible for the conversion of milk into curd through the production of acids that partially digest milk proteins?
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Bottled fruit juices bought from the market are clearer as compared to those made at home. Reason (R): Bottled juices are clarified by the use of pectinases and proteases. In the light of the above statements, choose the correct answer from the options given below:
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Match List-I with List-II: List-I List-II A Methanobacterium I Rumen of cattle B Rhizobium II Leguminous root nodules C Oscillatoria III Paddy fields D Trichoderma IV Root ecosystems Choose the correct answer from the options given below:
Read answer →Biology · MICROBES IN HUMAN WELFARE
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The greater the BOD of waste water, more is its polluting potential. Reason (R): BOD measures the rate of uptake of oxygen by micro-organisms in a sample of water, indicating the amount of organic matter present. In the light of the above statements, choose the correct answer from the options given below:
Read answer →Biology · MICROBES IN HUMAN WELFARE
Roquefort cheese is ripened by growing a specific organism on them, which imparts a particular flavor. Identify the organism.
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Given below are two statements: Statement I: Microbes are present everywhere—in soil, water, air, inside our bodies and even at sites where no other life-form could possibly exist. Statement II: Microbes like bacteria and many fungi cannot be grown on nutritive media to form colonies. In the light of the above statements, choose the most appropriate answer from the options given below:
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Match List-I with List-II: List-I List-II A Methanobacterium I Free-living nitrogen fixer in soil B Trichoderma II Biocontrol fungus against plant pathogens C Azotobacter III Produces methane in anaerobic sludge D Nucleopolyhedrovirus IV Species-specific narrow spectrum insecticidal virus Choose the correct answer from the options given below:
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Consider the following statements regarding secondary sewage treatment: (A) The primary effluent is passed into large aeration tanks where it is constantly agitated mechanically and air is pumped into it. (B) This allows vigorous growth of useful aerobic microbes into flocs. (C) These microbes consume the major part of the organic matter in the effluent, significantly reducing BOD. (D) The BOD test measures the rate of uptake of oxygen by micro-organisms in a sample of water. How many of the above statements are correct?
Read answer →Biology · MICROBES IN HUMAN WELFARE
Which of the following best describes the structural component of a biogas plant where spent slurry is removed after microbial action?
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Which of the following microorganisms is primarily responsible for the production of methane gas in anaerobic sludge during sewage treatment and in the rumen of cattle?
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Given below are two statements: Statement I: Lactic acid bacteria (LAB) grow in milk and convert it to curd, while also improving its nutritional quality by increasing vitamin B12. Statement II: Production on an industrial scale requires growing microbes in very large vessels called fermentors. In the light of the above statements, choose the most appropriate answer from the options given below:
Read answer →Biology · MICROBES IN HUMAN WELFARE
What does BOD refer to in the context of sewage treatment?
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The puffed-up appearance of dough used for making foods such as dosa and idli is primarily due to the metabolic activity and production of which of the following gases?
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Match List-I with List-II: List-I List-II A Acetobacter aceti I Butyric acid B Clostridium butylicum II Acetic acid C Lactobacillus III Ethanol D Saccharomyces cerevisiae IV Lactic acid Choose the correct answer from the options given below:
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Consider the following statements regarding microbes and household products: (A) LAB grow in milk and convert it to curd by digesting all milk proteins completely. (B) The puffed-up appearance of dough for dosa and idli is due to the production of \( \text{CO}_2 \) gas. (C) Baker's yeast used for making bread is Saccharomyces cerevisiae. (D) Swiss cheese has large holes due to production of \( \text{CO}_2 \) by Propionibacterium sharmanii. Which of the above statements are correct?
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Which governmental bodies in India were principally responsible for developing the technology of biogas production?
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Which of the following micro-organisms act as free-living nitrogen fixers in the soil?
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Eradication of creature species that are commonly viewed as pests in organic farming is considered undesirable by organic farmers. Reason (R): Without pests as food or hosts, beneficial predatory and parasitic insects that depend upon them would not be able to survive, disrupting ecosystem balance. In the light of the above statements, choose the correct answer from the options given below:
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Match List-I with List-II: List-I List-II A Glomus I Legume root nodule symbiont B Rhizobium II Free-living nitrogen fixing cyanobacterium C Nostoc III Forms mycorrhiza D Azospirillum IV Free-living bacterial nitrogen fixer Choose the correct answer from the options given below:
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Given below are two statements: Statement I: Microbes are present everywhere on earth, including thermal vents where temperature may be as high as \( 100^\circ\text{C} \). Statement II: Microbes cannot survive in layers of snow several metres thick or in highly acidic environments. In the light of the above statements, choose the most appropriate answer from the options given below:
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Given below are two statements: Statement I: Alexander Fleming discovered penicillin while working on Streptococci bacteria, observing a mould growing on an unwashed culture plate. Statement II: The full potential of penicillin as an effective antibiotic was established by Ernest Chain and Howard Florey. In the light of the above statements, choose the most appropriate answer from the options given below:
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Consider the following statements regarding microbes and their industrial applications: (A) Aspergillus niger is a fungus used for the production of citric acid. (B) Acetobacter aceti is a bacterium used for the production of acetic acid. (C) Clostridium butylicum produces butyric acid. (D) Lactobacillus converts milk to curd and produces lactic acid. How many of the above statements are correct?
Read answer →Biology · MICROBES IN HUMAN WELFARE
