Assertion & Reason Test: Microbes in Human Welfare - NEET MCQ
10 Questions MCQ Test Biology Class 12 - Assertion & Reason Test: Microbes in Human Welfare
Directions : In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :
Assertion (A) : Blue green algae are popular as biofertilizers.
Reason (R) : Blue green algae cause algal bloom in polluted water bodies
Directions : In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :
Assertion (A) : Rhizobium leguminosarum is a symbiotic bacterium found in the root nodules of leguminous plants.
Reason (R) : They have the ability to fix atmospheric nitrogen.
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Directions : In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :
Assertion (A) : Cyanobacteria increase the soil fertility and also add organic matter to the soil.
Reason (R) : They can fix free nitrogen in the atmosphere.
Directions : In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :
Assertion (A) : Methanogens do not produce oxygen.
Reason (R) : Methanogens are obligate anaerobic microorganisms.
Directions : In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :
Assertion (A) : An inoculum of curd is used for curdling of milk.
Reason (R) : It contains Lactobacillus, which improves nutritional quality by increasing Vitamin B12.
Directions : In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :
Assertion (A) : Bottled fruit juices bought from the market are clearer as compared to those made at home.
Reason (R) : They are clarified by pectinases and proteases.
Directions : In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :
Assertion (A) : Statin is produced by a yeast called Trichoderma polysporum.
Reason (R) : It lowers the blood cholesterol level in the body.
Directions : In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :
Assertion (A) : Activated sludge should have the ability to settle quickly.
Reason (R) : To absorb pathogenic bacteria present in wastewater while sinking to the bottom of the settling tank.
Directions : In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :
Assertion (A) : Nucleopolyhedrovirus are useful as they are good biocontrol agents.
Reason (R) : They are species-specific, narrow spectrum bioinsecticides.
Directions : In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion (A) : Members of the genus Glomus from mycorrhiza.
Reason (R) : Mycorrhiza is an association of plants and fungi.
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