CBSE Class 12 Biology Microbes in Human Welfare (2). CBSE issues sample papers every year for students for class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this year. The sample papers have been provided with marking scheme. It’s always recommended to practice as many CBSE sample papers as possible before the board examinations. Sample papers should be always practiced in examination condition at home or school and the student should show the answers to teachers for checking or compare with the answers provided. Students can download the sample papers in pdf format free and score better marks in examinations. Refer to other links too for latest sample papers.
ONE MARK QUESTION
1 Name the group of organisms and the substrate they act on to produce biogas.
2 What is the role of bacterium in the production of Swiss cheese?
3 How can small amount of curd added to fresh milk convert it to curd?
4 write the scientific name of baker’s yeast.
TWO MARK QUESTIONS
5 What are baculoviruses? Write their significance in agriculture.
7 Mention the functions of LAB that are useful to man.
8 Name any four industrial products that employ microbes in their production.
9 Name any two alcoholic bewerages produced in each of the following ways:
a) With distillation
b) Without distillation
10 Mention any four diseases that can be treated by antibiotics.
3 MARK QUESTIONS
11 Name the three types of micro organisms acting as biofertilizers. How do they enrich the soil fertility?
12 Name any three organic acids and the microbes producing them.
13 Describe biogas plant.
14 Write the names of microbes from which Cyclosporin A, Statin and streptokinase obtained. Also write their importance.
5 MARK QUESTIONS
15 Dscribe the treatment of sewage before it is discharged into a water body like a river.
16 What are biofertilizers? Name the categories of organisms used as biofertilizers with an example for each.
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