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CBSE 12th Standard Biology Subject Microbes in Human Welfare HOT Questions 1 Marks Questions 2021

Published on: 29/05/2021

QB365 Provides the HOT Question Papers for Class 12 Biology, and also provide the detail solution for each and every HOT Questions. HOT Questions will help to get more idea about question pattern in every exams and also will help to get more marks in Exams

Download CBSE Class 12th Standard CBSE Biology question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Biology

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Std: 12th Standard CBSE - Biology

chapter: - HOT Questions

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Questions:

1 Marks

10 x 1 = 10

GM crops are favored by some countries, while in India it is still banned. Can you suggest merits and demerits of such crops?

Swati knows that the cow excreta contains a specific bacteria. Name the type of bacteria and how it can be socially used.

Raman underwent kidney transplantation after which he observed allergic reactions. Can you suggest the name of microbial product and its source for controlling them.

As Saccharomyces cerevisiae produces CO2 during fermentation, if fermented dough of Aspergillus niger is used to make bread, then what happens on its consumption?

A farmer was practicing mono culture in his field .Then he was advised to raise paddy crops in his field. He raised after that he observed a boom in the fertility of the field. What can be the reason behind it? Justify your answer.

Citric acid is available in the market and acts as an excellent food preservative, can you name the microorganism out of which it is extracted?

What would happen if our intestine harbors microbial flora exactly similar to that found in the rumen of cattle?

Why is cow dung used in the generation of biogas?

What would have happened if antibiotics were not discovered?

10.

Why do we prefer to call secondary wastewater treatment as biological treatment?

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Answers Key:

1 Marks

10 x 1 = 10

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Merits : Enhance the quality & quantity of crops, less requirement of insecticide & pesticides, improve agronomic characteristics. Demerits : Favors new pathogen strain , dependability of farmers on biogenic companies.

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Methanogens (Archebacteria), Social use: lightening & cooking by using gobar gas.

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Product : cyclosporine A, Source : Trichoderma polysporum (fungi)

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Food will produce toxicity because Aspergillus niger produce aflatoxins.

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Nitrogen fixation by autotrophic microbes cyanobacteria e.g. Anabaena, Nostoc, Oscillatoria. Cyanobacteria enrich the soil with organic matter and nitrogen components.

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Aspergillus niger (A fungus)

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Microbial flora present in the rumen of cattle takes part in digestion of cellulose. Presence of this microbial flora will enable us to digest cellulose.