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CUET UG Biology in Human Welfare & Health — practice questions — page 2

Explore 36 free Biology in Human Welfare & Health questions in CUET UG Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Biology in Human Welfare & Health questions and exercises with answers

Showing questions 31–36 of 36.

The fungus developed as a biological control for plant disease is:Read the answer and worked solution →Sewage is treated until its BOD is:Read the answer and worked solution →Cyanobacteria such as Anabaena serve as biofertilisers in:Read the answer and worked solution →Penicillin was named after which mould?Read the answer and worked solution →Milk is converted into curd by which micro-organism?Read the answer and worked solution →The puffed up appearance of dough is caused by:Read the answer and worked solution →

Worked practice questions

The fungus developed as a biological control for plant disease is:

  1. Trichoderma
  2. Penicillium
  3. Aspergillus
  4. Rhizopuses
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Correct answer: A. Trichoderma

1. It is a free living fungus common in root ecosystems. 2. It is used against plant pathogens rather than insects. 3. That fungus is Trichoderma. 4. So the answer is Trichoderma. _Source: syllabus Biology, Ch 8 'Microbes in Human Welfare'_

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Sewage is treated until its BOD is:

  1. Reduced
  2. Doubled
  3. Trebled
  4. Ignored
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Correct answer: A. Reduced

1. A high BOD marks water heavy with organic matter. 2. Treatment removes that matter. 3. So sewage is treated till the BOD is reduced. 4. The answer is reduced. _Source: syllabus Biology, Ch 8 'Microbes in Human Welfare'_

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Cyanobacteria such as Anabaena serve as biofertilisers in:

  1. Desert sands
  2. Frozen soils
  3. Marine deeps
  4. Paddy fields
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Correct answer: D. Paddy fields

1. These organisms need standing water to thrive. 2. One farming system floods its fields. 3. So they act as biofertilisers in paddy fields. 4. The answer is paddy fields. _Source: syllabus Biology, Ch 8 'Microbes in Human Welfare'_

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