Microbes in Human Welfare

Bihar Board Class 12 · Biology · 37 past questions

1. Q1 2026 Set A

   Which vitamin content increases due to conversion of milk into curd ?

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2. Q2 2026 Set A

   Which of the following pairs is incorrect?

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3. Q3 2026 Set A

   Which of the following cyanobacteria fixes atmospheric nitrogen ?

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4. Q4 2026 Set A

   With the help of what are butterfly caterpillars controlled?

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5. Q5 2025

   Who among the following confirmed penicillin as a powerful and effective antibiotic?

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6. Q6 2025

   Which of the following produces citric acid?

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7. Q7 2025

   Which of the following statements is incorrect about streptokinase?

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8. Q8 2025

   Which of the following statements is incorrect about Trichoderma?

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9. Q9 2025

   Which of the following fungi terms mycorrhiza?

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10. Q10 2024 Set E

    Amount of which vitamin increases after conversion of milk into curd?

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11. Q11 2024 Set E

    Alexander Fleming discovered penicillin while working on which of the following bacteria?

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12. Q12 2024 Set E

    Which of the following inhibits synthesis of cholesterol?

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13. Q13 2023

    Which one is an example of endomycorrhiza ?

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14. Q14 2023

    Characteristic of blue-green algae is –

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15. Q15 2023

    Antibiotic cephalosporin is obtained from which one in the following?

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16. Q16 2023

    The most famous symbiotic nitrogen fixing bacterium is –

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17. Q17 2022 Set A

    Azolla forms a symbiotic relationship

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18. Q18 2021 Set H

    Biogas contains

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19. Q19 2021 Set H

    Who among the following is not related with microbiology ?

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20. Q20 2021 Set H

    Chlorella is a type of

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21. Q21 2021 Set H

    Which of the following is not a biofertilizer?

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22. Q22 2021 Set H

    The flour of Idli and Dosa is made by the use of which microbe ?

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23. Q23 2020

    Blue-green algae is a useful biofertilizer for which crop?

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24. Q24 2020

    Which bacterium is used in a gobar gas plant?

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25. Q25 2019

    For Nitrogen fixation in soil we may use

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26. Q26 2019

    Brewery is concerned with

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27. Q27 2019

    What are microbes? Describe their role in human welfare in brief.

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28. Q28 2018

    Which of the following is not bio fertilizer?

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29. Q29 2018

    Masses of bacteria associated with fungal filament to form a mesh like structure is called…

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30. Q30 2018

    Probiotic are…

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31. Q31 2018

    What do you mean by sewage? Describe the role of microbes in sewage treatment.

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32. Q32 2017

    Acetabularia is a type of -

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33. Q33 2017

    Bio fertilizer is present in root nodules of which non-leguminous plant?

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34. Q34 2017

    Which bacterium is used in formation of curd from milk?

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35. Q35 2016

    What is Chlorella among the following?

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36. Q36 2015

    The flour of Idli and Dosa is made by the use of which microbe?

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37. Q37 2015

    Which one of the following is helpful in the improvement of soil?

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