CBSE 12th Standard Biology Subject Microbes in Human Welfare HOT Questions 3 Marks Questions 2021
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CBSE 12th Standard Biology Subject Microbes in Human Welfare HOT Questions 3 Marks Questions 2021
12th Standard CBSE
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Reg.No. :
Biology
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What will happen if you add a small amount of curd to the fresh milk and keep it for few hours at 25oC.name the process, chemical changes and the resultant products? Name any three edible products prepared from it.
(a) -
Name the gobar gas liberated from a biogas plant.Which type of bacteria are responsible for its production? What are the advantages of using it as a source of energy?
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As we are going to face a great crisis of fossil fuel in near future, suggest an eco-friendly and pollution free alternative source of energy for rural areas which is dependent on microbial activity.
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Explain why some microorganisms are called biofertilizers.Give two examples.
(a) -
Identify the microorganism
(i) A soil inhabiting bacteria that forms a symbiotic association with the roots of leguminous plants
(ii) A cyanobacteria that forms a symbiotic association with an aquatic fern.
(iii) A microbe responsible for the preparation of the dough, which is used for making bread.
(iv) A methanogenic bacteria used in the production of biogas.(a)
3 Marks
