Microbes in Human Welfare

Bihar Board Class 12 · Biology · 37 past questions

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1. Q3 2026 Set A

   Which of the following cyanobacteria fixes atmospheric nitrogen ?

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2. Q14 2023

   Characteristic of blue-green algae is –

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3. Q16 2023

   The most famous symbiotic nitrogen fixing bacterium is –

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4. Q17 2022 Set A

   Azolla forms a symbiotic relationship

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5. Q21 2021 Set H

   Which of the following is not a biofertilizer?

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6. Q23 2020

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

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7. Q25 2019

   For Nitrogen fixation in soil we may use

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8. Q28 2018

   Which of the following is not bio fertilizer?

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9. Q33 2017

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

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10. Q37 2015

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

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