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NEET UG BIOLOGY MCQ: MICROBES IN HUMAN WELFARE
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Which of the following cyanobacteria can fix atmospheric nitrogen?
I. Volvox II. Oscillatoria
III. Nostoc IV. Anabaena
Choose the correct option
I. Volvox II. Oscillatoria
III. Nostoc IV. Anabaena
Choose the correct option
View answer and explanation
Correct option: C
II, III and IV
Option C (II, III and IV) is correct because Oscillatoria, Nostoc, and Anabaena are cyanobacteria known for their ability to fix atmospheric nitrogen, while Volvox is a green algae that does not fix nitrogen.
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provided with cyclosporin A may reject the
transplanted organ.
Reason: Cyclosporin A inhibits activation of T-cells
and interferes with destruction of non-self cells. Assertion (A): Streptokinase acts as a clot-buster.
Reason (R): Streptokinase is given to patients who have undergone myocardial infarction. The bacterium that commonly lives in animal and human intestine is Consider the following statements I. Ladybirds and dragonflies are used to get rid of aphids and mosquitoes II. The bacteria Bacillus thuringiensis (Bt) are used to control caterpillar III. Trichoderma sp. free living fungi, are present in root ecosystems where they act against several plant pathogens IV. Rhizobium is a symbiotic bacterium that lives in the stem of legumes Which of the statements given above are correct? Which of the following serve as biofertilizer in paddy fields? Methanogens, growing anaerobically on cellulosic material, produce