Biology - Microbes in Human Welfare Question with Solution | TestHub
Identify correct statements:
Statement (I):Azotobacteris 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:
Answer:
Solution:
Statement (I) is correct becauseAzotobacteris 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 becauseRhizobiumis the symbiotic nitrogen-fixing bacterium used as a biofertilizer for leguminous plants, whereasAzotobacteris generally used for non-leguminous crops.
Statement (IV) is incorrect becauseAzotobacteris free-living in the soil and is not intimately associated with the roots of gymnosperms. Cyanobacteria likeAnabaenaare associated with the coralloid roots of gymnosperms likeCycas.
Thus, Statements (I) and (II) are correct, while (III) and (IV) are incorrect.
Answer: Statement (I) and (II) are correct but (III) and (IV) are incorrect
