NEET UG BIOLOGY MCQ: MICROBES IN HUMAN WELFARE

1 Medium

1 of 1

Understanding +4 | -1

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?

View answer and explanation

Correct option: A

I, II and III

Option A (I, II and III) is correct because ladybirds and dragonflies control aphids and mosquitoes, Bacillus thuringiensis controls caterpillars, and Trichoderma species act against plant pathogens in root ecosystems. Statement IV is incorrect because Rhizobium lives in the *roots* of legumes, not the stem.

More Questions from MICROBES IN HUMAN WELFARE

Practice All Chapter MCQs →

Assertion: An organ transplant patient if not
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 Which of the following serve as biofertilizer in paddy fields? Methanogens, growing anaerobically on cellulosic material, produce Clot buster agent streptokinase is produced by