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NEET UG Microbes in Human Welfare — practice questions — page 2

Explore 44 free Microbes in Human Welfare questions in NEET UG Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Microbes in Human Welfare questions and exercises with answers

Showing questions 31–44 of 44.

Which predator and pest pairing is used in biological pest control?Read the answer and worked solution →How do statins lower blood cholesterol?Read the answer and worked solution →Which bacterium is used for commercial production of butyric acid?Read the answer and worked solution →In mycorrhiza formed by Glomus, the fungus mainly supplies the plant with:Read the answer and worked solution →Which of these fixes atmospheric nitrogen while free-living in soil?Read the answer and worked solution →Along with IARI, which body developed biogas technology in India?Read the answer and worked solution →A typical biogas plant has a concrete tank of roughly what depth?Read the answer and worked solution →Fleming discovered penicillin while working on which bacteria?Read the answer and worked solution →In primary sewage treatment, all the solids that settle form the:Read the answer and worked solution →Which ministry initiated the Ganga Action Plan?Read the answer and worked solution →Besides phosphorus uptake, plants with mycorrhiza also show:Read the answer and worked solution →Cyanobacteria serve as an important biofertiliser in which fields?Read the answer and worked solution →A common methanogen that grows anaerobically on cellulose is:Read the answer and worked solution →The spent slurry removed from a biogas plant can be used as:Read the answer and worked solution →

Worked practice questions

Which predator and pest pairing is used in biological pest control?

  1. Dragonfly against whiteflies
  2. Dragonfly against aphids
  3. Ladybird beetle against mosquitoes
  4. Ladybird beetle against aphids
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Correct answer: D. Ladybird beetle against aphids

The red and black ladybird beetle feeds on aphids, while dragonflies help keep mosquitoes down.

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How do statins lower blood cholesterol?

  1. Block its absorption in the gut
  2. Dissolve deposits in arteries
  3. Inhibit a cholesterol-making enzyme
  4. Raise excretion of bile salts
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Correct answer: C. Inhibit a cholesterol-making enzyme

Statins act as competitive inhibitors of the enzyme responsible for synthesising cholesterol.

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Which bacterium is used for commercial production of butyric acid?

  1. Acetobacter aceti
  2. Lactobacillus lactis
  3. Clostridium butylicum
  4. Streptococcus lactis
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Correct answer: C. Clostridium butylicum

Clostridium butylicum is the bacterium that produces butyric acid on an industrial scale.

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