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Science (English Medium) Class 12 - CBSE Important Questions

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Why are the fruit juices bought from market clearer as compared to those made at home?

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

Name the bioactive molecules produced by Trichoderma polysporum and Monascus purpureus.

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

Name the source of streptokinase. How does this bioreactor molecule function in our body?

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

How do mycorrhizae act as biofertilizers? Explain.

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

Explain the function of “anaerobic sludge digester” in a sewage treatment plant.

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

Mention one advantage and one disadvantage to a farmer who uses them.

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

Distinguish between the roles of flocs and anaerobic sludge digesters in sewage treatments.

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

How does the application of the fungal genus, Glomus, to the agricultural farm increase the farm output? 

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

By taking two examples explain how has bio-fortification helped in improving food quality.

Appears in 1 question paper
Chapter: [8] Strategies for Enhancement in Food Production
Concept: Introduction of Strategies for Enhancement in Food Production

How does the application of cyanobacteria help improve agricultural output?

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

Name the following:  Any one inter-specific hybrid mammal.

Appears in 1 question paper
Chapter: [8] Strategies for Enhancement in Food Production
Concept: Introduction of Strategies for Enhancement in Food Production

Name a genus of fungi that forms a mycorrhizal association with plants.

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

State the difference in organic farmers approach from that of conventional pest control methods.

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

"Man can be a primary as well as a secondary consumer." Justify this statement.

Appears in 1 question paper
Chapter: [8] Strategies for Enhancement in Food Production
Concept: Strategies for Enhancement in Food Production (Questions)

Bottled fruit juices are clearer as compared to those made at home. Explain.

 

 
Appears in 1 question paper
Chapter: [8] Strategies for Enhancement in Food Production
Concept: Introduction of Strategies for Enhancement in Food Production

Name the animals in which methanogens occur and the role they play there.

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

Explain the interrelationship between organic farming and biofertilizers, with the help of any three suitable examples.

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

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
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