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Assertion & Reason Test: Microbes in Human Welfare - NEET MCQ


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10 Questions MCQ Test Biology Class 12 - Assertion & Reason Test: Microbes in Human Welfare

Assertion & Reason Test: Microbes in Human Welfare for NEET 2024 is part of Biology Class 12 preparation. The Assertion & Reason Test: Microbes in Human Welfare questions and answers have been prepared according to the NEET exam syllabus.The Assertion & Reason Test: Microbes in Human Welfare MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Assertion & Reason Test: Microbes in Human Welfare below.
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Assertion & Reason Test: Microbes in Human Welfare - Question 1

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

Detailed Solution for Assertion & Reason Test: Microbes in Human Welfare - Question 1
Blue-green algae are not popular as biofertilizers, besides adding organic matter to the soil and increasing its fertility because they cause algal bloom in polluted water bodies and have copious mucilage that makes the fields slippery.
Assertion & Reason Test: Microbes in Human Welfare - Question 2

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.

Detailed Solution for Assertion & Reason Test: Microbes in Human Welfare - Question 2
Rhizobium leguminosarum is a symbiotic bacterium that serves as a biofertilizer. These bacteria fix atmospheric nitrogen into organic forms, which is used by the plant as a nutrient.
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Assertion & Reason Test: Microbes in Human Welfare - Question 3

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.

Detailed Solution for Assertion & Reason Test: Microbes in Human Welfare - Question 3
Cyanobacteria are autotrophic microbes that can fix atmospheric nitrogen. They are also important biofertilizers that add organic matter to the soil.
Assertion & Reason Test: Microbes in Human Welfare - Question 4

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.

Detailed Solution for Assertion & Reason Test: Microbes in Human Welfare - Question 4
Methanogens are obligate anaerobic micro-organisms which do not produce oxygen. In the digesters (during secondary treatment of waste water), hetero-trophic microbes (methanogens) anaerobically digest bacteria and fungi in sludge producing mixture of gases such as methane, hydrogen sulphide and CO2 which form the biogas.
Assertion & Reason Test: Microbes in Human Welfare - Question 5

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.

Detailed Solution for Assertion & Reason Test: Microbes in Human Welfare - Question 5
The lactobacillus produces acids which coagulate and partially digest the milk proteins. An inoculum of curd contains millions of LAB, which convert milk to curd.
Assertion & Reason Test: Microbes in Human Welfare - Question 6

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.

Detailed Solution for Assertion & Reason Test: Microbes in Human Welfare - Question 6
The juice which is prepared at home is turbid, due to the presence of fibres, pectin, etc. The bottled fruit juices are clearer because they are clarified by pectinases and proteases.
Assertion & Reason Test: Microbes in Human Welfare - Question 7

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.

Detailed Solution for Assertion & Reason Test: Microbes in Human Welfare - Question 7
Statin is produced by a yeast called Monascus purpureus It is a blood cholesterol lowering agent.
Assertion & Reason Test: Microbes in Human Welfare - Question 8

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.

Detailed Solution for Assertion & Reason Test: Microbes in Human Welfare - Question 8
Activated sludge should have the ability to settle quickly so that it can be rapidly pumped back from sedimentation tank to aeration tank
Assertion & Reason Test: Microbes in Human Welfare - Question 9

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.

Detailed Solution for Assertion & Reason Test: Microbes in Human Welfare - Question 9
Nucleopolyhedrovirus is from the genus of baculoviruses. They are useful as they are good biocontrol agents. They are species specific, narrow spectrum bioinsecticides. They control only species specific pests, do not affect non-targeted organisms / beneficial insects are conserved / they aid in IPM problems / have no negative impact on plants or other animals.
Assertion & Reason Test: Microbes in Human Welfare - Question 10

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.

Detailed Solution for Assertion & Reason Test: Microbes in Human Welfare - Question 10
Glomus is a genus of arbuscular mycorrhizal and forms a symbiotic association with plants.
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