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Science (English Medium) Class 12 - CBSE Important Questions

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Answer the following question.
What are ‘flocs’, formed during secondary treatment of sewage?

Appears in 1 question paper
Chapter: [8] Microbes in Human Welfare
Concept: Microbes in Sewage Treatment

Answer the following question.
Write any two places where methanogens can be found.

Appears in 1 question paper
Chapter: [8] Microbes in Human Welfare
Concept: Microbes in Production of Biogas

Answer the following question:
Name the group of bacteria involved in setting milk into curd. Explain the process they carry in doing so. Write another beneficial role of such bacteria.

Appears in 1 question paper
Chapter: [8] Microbes in Human Welfare
Concept: Microbes in Household Products

Answer the following question.
What are 'flocs', formed during secondary treatment of sewage?

Appears in 1 question paper
Chapter: [8] Microbes in Human Welfare
Concept: Microbes in Sewage Treatment

Answer the following question.
Write any two places where methanogens can be found.

Appears in 1 question paper
Chapter: [8] Microbes in Human Welfare
Concept: Microbes in Production of Biogas

How does the activity of each one of the following help in organic farming?
Mycorrhiza

Appears in 1 question paper
Chapter: [8] Microbes in Human Welfare
Concept: Microbes as Biocontrol Agents

How does the activity of each one of the following help in organic farming?
Cyanobacteria

Appears in 1 question paper
Chapter: [8] Microbes in Human Welfare
Concept: Microbes as Biofertilizers

Answer the following question.
Secondary treatment of the sewage is also called Biological treatment. Justify this statement and explain the process.

Appears in 1 question paper
Chapter: [8] Microbes in Human Welfare
Concept: Microbes in Sewage Treatment

Answer the following question.
Describe the roles of heat, primers, and the bacterium Thermus aquaticus in the process of PCR.

Appears in 1 question paper
Chapter: [8] Microbes in Human Welfare
Concept: Applications of Biotechnology in Health and Medicine

Answer the following question.
Explain the various steps involved in the production of artificial insulin.

Appears in 1 question paper
Chapter: [8] Microbes in Human Welfare
Concept: Applications of Biotechnology in Health and Medicine

State the medicinal value and the bioactive molecules produced by Penicillium notatum.

Appears in 1 question paper
Chapter: [8] Microbes in Human Welfare
Concept: Microbes in Industrial Products

State the medicinal value and the bioactive molecules produced by Monascus purpureus.

Appears in 1 question paper
Chapter: [8] Microbes in Human Welfare
Concept: Microbes in Industrial Products

State the medicinal value and the bioactive molecules produced by Trichoderma polysporum.

Appears in 1 question paper
Chapter: [8] Microbes in Human Welfare
Concept: Microbes in Industrial Products

Describe the role of high temperature.

Appears in 1 question paper
Chapter: [8] Microbes in Human Welfare
Concept: Applications of Biotechnology in Health and Medicine

Describe the role of primers.

Appears in 1 question paper
Chapter: [8] Microbes in Human Welfare
Concept: Applications of Biotechnology in Health and Medicine

Describe the role of bacterium Thermus aquaticus in carrying the process of polymerase chain reaction.

Appears in 1 question paper
Chapter: [8] Microbes in Human Welfare
Concept: Applications of Biotechnology in Health and Medicine

Answer the following question based on Meselson and Stahl's experiment on E. coli :

Write the name of the chemical substance used as the only source of nitrogen in the experiment.

Appears in 1 question paper
Chapter: [8] Microbes in Human Welfare
Concept: Microbes in Industrial Products

Name the microbes that help the production of the following product commercially:
Statin

Appears in 1 question paper
Chapter: [8] Microbes in Human Welfare
Concept: Microbes in Industrial Products

Name the microbes that help the production of the following product commercially:
Citric acid

Appears in 1 question paper
Chapter: [8] Microbes in Human Welfare
Concept: Microbes in Household Products

Name the microbes that help the production of the following product commercially:
Penicillin

Appears in 1 question paper
Chapter: [8] Microbes in Human Welfare
Concept: Microbes in Industrial Products
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