MHT CET Medical202623 April 2026Evening ShiftBiologyMicrobes in Human WelfareActual
Identify correct statements: Statement (I): Azotobacter is a free living, nitrogen-fixing bacteria. Statement (II): It is an aerobic, non-photosynthetic, non-nodule-forming bacteria Statement (III): It is used as a biofertlizer for all leguminous plants. Statement (IV): It is intimately associated with the roots of Gymnosperms.
Options
- AAll statements are correct
- BAll statements are wrong
- CStatement (I) and (II) are correct but (III) and (IV) are incorrect
- DStatement (III) and (IV) are correct but (I) and (II) are incorrect
Correct answer
C. Statement (I) and (II) are correct but (III) and (IV) are incorrect
Step-by-step solution
Statement (I) is correct because Azotobacter is a free-living, nitrogen-fixing bacterium found in soil. Statement (II) is correct as it is an aerobic, non-photosynthetic, and non-nodule-forming bacterium. Statement (III) is incorrect because Rhizobium is the symbiotic nitrogen-fixing bacterium used as a biofertilizer for leguminous plants, whereas Azotobacter is generally used for non-leguminous crops. Statement (IV) is incorrect because Azotobacter is free-living in the soil and is not intimately associated with t