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Microbes in Human Welfare

Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.

Microbes in Household Products

Subtopic

Microbes in Household Products under Microbes in Human Welfare for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    What is the primary reason for adding a 'starter' to milk?

    A.

    To flavor the milk

    B.

    To provide a high initial population of LAB

    C.

    To cool the milk down

    D.

    To remove the lactose

  2. 2.

    Which of the following is a role of LAB in the stomach?

    A.

    Promoting the growth of pathogens

    B.

    Increasing acidity to harmful levels

    C.

    Checking the growth of disease-causing microbes

    D.

    Digesting cellulose

  3. 3.

    The amount of CO2CO_2 produced during fermentation determines the ______ in many types of cheese.

    A.

    Sweetness

    B.

    Saltiness

    C.

    Size of the holes

    D.

    Vitamin content

Download the worksheet for Microbes in Human Welfare - Microbes in Household Products to practice offline. It includes additional chapter-level practice questions.

Microbes in Industrial Products

Subtopic

Microbes in Industrial Products under Microbes in Human Welfare for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    The use of microbes to produce high-value products like antibiotics and enzymes is part of:

    A.

    Small-scale gardening

    B.

    Industrial microbiology

    C.

    Traditional agriculture

    D.

    Domestic waste management

  2. 2.

    Which bacterium produces Acetic acid industrially?

    A.

    Acetobacter aceti

    B.

    Clostridium butylicum

    C.

    Lactobacillus

    D.

    Streptococcus

  3. 3.

    Which of these is a correct pairing of a product and its application?

    A.

    Statins - Clot buster

    B.

    Cyclosporin A - Immunosuppressant

    C.

    Streptokinase - Cholesterol lowering

    D.

    Protease - Antibiotic

Download the worksheet for Microbes in Human Welfare - Microbes in Industrial Products to practice offline. It includes additional chapter-level practice questions.

Sewage Treatment

Subtopic

Sewage Treatment under Microbes in Human Welfare for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    What is the relationship between the polluting potential of water and its BODBOD?

    A.

    Higher the BOD, lower the polluting potential

    B.

    Higher the BOD, higher the polluting potential

    C.

    BOD has no relation to pollution

    D.

    Pollution only increases when BOD is zero

  2. 2.

    The primary sludge is used for:

    A.

    Making yogurt

    B.

    Landfills or composting

    C.

    Drinking water

    D.

    Inoculum for aeration tanks

  3. 3.

    Activated sludge is mainly composed of:

    A.

    Grit and silt

    B.

    Flocs of decomposer microbes

    C.

    Chemical disinfectants

    D.

    Primary effluent

Download the worksheet for Microbes in Human Welfare - Sewage Treatment to practice offline. It includes additional chapter-level practice questions.

Microbes in Production of Biogas

Subtopic

Microbes in Production of Biogas under Microbes in Human Welfare for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Which of the following is a major advantage of using biogas for cooking?

    A.

    It leaves no residue

    B.

    It has a high calorific value and is smoke-free

    C.

    It is very heavy to carry

    D.

    It requires constant oxygen supply

  2. 2.

    What is the primary role of the digester tank in a biogas plant?

    A.

    To store the final gas

    B.

    To provide a site for microbial decomposition

    C.

    To filter the water

    D.

    To collect sunlight

  3. 3.

    The technology of biogas production was highly successful in India due to the efforts of:

    A.

    WHO

    B.

    IARI and KVIC

    C.

    UNESCO

    D.

    Ministry of Finance

Download the worksheet for Microbes in Human Welfare - Microbes in Production of Biogas to practice offline. It includes additional chapter-level practice questions.

Microbes as Biocontrol Agents and Biofertilizers

Subtopic

Microbes as Biocontrol Agents and Biofertilizers under Microbes in Human Welfare for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Based on the following classification of biofertilizers, which of the following sets correctly identifies the microbial examples for X, Y, and Z?

    A.

    X: TrichodermaTrichoderma, Y: AzospirillumAzospirillum, Z: AnabaenaAnabaena

    B.

    X: RhizobiumRhizobium, Y: GlomusGlomus, Z: OscillatoriaOscillatoria

    C.

    X: GlomusGlomus, Y: RhizobiumRhizobium, Z: NostocNostoc

    D.

    X: AnabaenaAnabaena, Y: AzotobacterAzotobacter, Z: GlomusGlomus

  2. 2.

    Which cyanobacterium is often used to fix nitrogen in agricultural fields?

    A.

    GlomusGlomus

    B.

    TrichodermaTrichoderma

    C.

    NostocNostoc

    D.

    RhizobiumRhizobium

  3. 3.

    The use of chemical pesticides is discouraged because they:

    A.

    Are too cheap

    B.

    Are biodegradable

    C.

    Kill both useful and harmful life forms

    D.

    Increase biodiversity

Download the worksheet for Microbes in Human Welfare - Microbes as Biocontrol Agents and Biofertilizers to practice offline. It includes additional chapter-level practice questions.