CBSE Class 12 Biology Microbes In Human Welfare Worksheet Set A

CBSE Class 12 Biology Microbes in Human Welfare (1). 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. 

1 Why does ‘Swiss cheese’ have big holes?

2 Why do we prefer to call secondary waste water treatment as biological treatment?

3 What for Nucleopolyhydro viruses are being used now a days?

4 Which species of Penicillium produces Roquefort cheese?

5 Match the following list of bacteria and their commercially important products: Bacterium Product (i) Aspergillus niger (a) Lactic acid (ii) Acetobacter aceti (b) Butyric acid (iii) Clostridium butylicum (c) Acetic acid (iv) Lactobacillus (d) Citric acid

6 How do mycorrhizal fungi help the plants harbouring them?

7 What is the chemical nature of biogas. Name an organism which is involved in biogas production?

8 What are biofertilisers? Give two examples.

9 Explain the role of baculoviruses as biological control agents. Mention their importance in organic farming.

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