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NEET • BIOLOGY • MICROBES IN HUMAN WELFARE

Microbes in human welfare practice · Mixed difficulty

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Showing 31-60 of 122 questions

31 Medium

31 of 122

Understanding +4 | -1

Microbes are used in
I. primary treatment of sewage
II. secondary treatment of sewage
III. anaerobic sludge digesters
IV. production of biogas
Choose the correct option

View answer and explanation

Correct option: C

II, III and IV

Option C (II, III and IV) is correct because microbes are essential in secondary sewage treatment, anaerobic sludge digestion, and biogas production, but not in primary treatment.

32 Easy

32 of 122

Remembering +4 | -1

Yeast is an important source of

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Correct option: A

Riboflavin

Option A (Riboflavin) is correct because yeast is a rich source of B vitamins, including riboflavin (vitamin B2).

33 Hard

33 of 122

Understanding +4 | -1

Assertion: Dragonflies can be used to decrease occurrence of diseases like malaria, dengue, etc.
Reason: Baculoviruses are effective in controlling many insects and other arthropods.

View answer and explanation

Correct option: B

If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

Option B is correct because both the assertion and reason are true, but the reason doesn't explain why dragonflies decrease diseases like malaria and dengue.

34 Medium

34 of 122

Understanding +4 | -1

Biogas production from waste biomass with the help of methanogenic bacteria is

View answer and explanation

Correct option: D

Three step process

The correct answer is A (Multi step process) because biogas production involves hydrolysis, acidogenesis, acetogenesis, and methanogenesis, making it a multi-step process.

35 Hard

35 of 122

Remembering +4 | -1

What kind of organism methanogens are?

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Correct option: C

Anaerobic bacteria

The correct answer is C (Anaerobic bacteria) because methanogens are a type of archaea that thrive in the absence of oxygen and produce methane.

36 Medium

36 of 122

Understanding +4 | -1

Study the following flow chart that shows curd formation from milk and select the correct option for A and B
Milk is incubated with curd
↓
LAB shows growth in milk
↓
Production of …..A…..
↓
Coagulation and digestion of milk protein
↓
Improved nutritional quality by increased ….B….

View answer and explanation

Correct option: B

A-lactic acid; B-vitamin-

{B_{12}}

Option B is correct because LAB produces lactic acid, which coagulates milk protein, and increases vitamin-

{B_{12}}

improving nutritional quality.

37 Easy

37 of 122

Remembering +4 | -1

Which of the following organism is useful in the preparation of Roquefort cheese?

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Correct option: C

Aspergillus

Option D (Penicillum) is correct because Roquefort cheese is made using *Penicillium roqueforti*.

38 Medium

38 of 122

Remembering +4 | -1

Which of the following cyanobacteria can fix atmospheric nitrogen?
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.

39 Medium

39 of 122

Understanding +4 | -1

Discharge of sewage in water bodies does not leads to

View answer and explanation

Correct option: D

Biomagnification

Option D (Biomagnification) is correct because the discharge of sewage in water bodies does not directly lead to biomagnification, which is the accumulation of toxins in the food chain.

40 Hard

40 of 122

Understanding +4 | -1

Assertion: Beer and wine are called soft liquors
while gin, rum, etc. are hard liquors.

Reason: Beer and wine are made without
distillation.

View answer and explanation

Correct option: B

If both Assertion and Reason are true but Reason
is not the correct explanation of Assertion

Option B is correct because both the assertion and reason are true, but the reason doesn't explain why they are classified as soft or hard liquors.

41 Medium

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Understanding +4 | -1

Assertion: Newer antibiotics are required to be produced regularly.
Reason: Pathogens often develop resistance to existing antibiotics.

View answer and explanation

Correct option: A

If both Assertion

\&

Reason are true and the reason is the correct explanation of the assertion

Option A (If both Assertion & Reason are true and the reason is the correct explanation of the assertion) is correct because pathogens develop resistance to existing antibiotics, necessitating the regular production of newer antibiotics to combat these resistant strains.

42 Easy

42 of 122

Remembering +4 | -1

Primary treatment is the

View answer and explanation

Correct option: A

Physical removal of large and small particles from sewage

Option A (Physical removal of large and small particles from sewage) is correct because primary treatment involves physical processes like sedimentation and filtration to remove solids.

43 Medium

43 of 122

Remembering +4 | -1

A bioactive molecule _______is used as an immunosuppressive agent in organ transplant patients produced by the fungus Trichoderma polysporum.

View answer and explanation

Correct option: C

Cyclosporin A

Option C (Cyclosporin A) is correct because Cyclosporin A, produced by the fungus Trichoderma polysporum, is used as an immunosuppressive agent in organ transplant patients.

44 Hard

44 of 122

Understanding +4 | -1

Assertion: Trichoderma is used as biocontrol agents.

Reason: Bacculoviruses are also used as biocontrol agent.

View answer and explanation

Correct option: B

If both Assertion and Reason are correct but Reason is not a correct explanation of Assertion

Option B (If both Assertion and Reason are correct but Reason is not a correct explanation of Assertion) is correct because both Trichoderma and Baculoviruses are used as biocontrol agents, but the reason doesn't explain why Trichoderma is used as a biocontrol agent.

45 Easy

45 of 122

Remembering +4 | -1

Cheese and yoghurt are products of

View answer and explanation

Correct option: B

Fermentation

Option B (Fermentation) is correct because cheese and yogurt production relies on the fermentation of milk by specific bacteria.

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46 Medium

46 of 122

Remembering +4 | -1

Toddy is made by …A… of sap from palm tree by …B… . Here A and B refers to

View answer and explanation

Correct option: B

A-fermentation; B-bacteria

Option A (A-fermentation; B-yeast) is correct because toddy is made by fermentation of sap from palm trees by yeast.

47 Medium

47 of 122

Understanding +4 | -1

Mycorrhiza does not help the host plant in

View answer and explanation

Correct option: D

Increasing its resistance to insects

Option D (Increasing its resistance to insects) is correct because mycorrhizae primarily enhance nutrient uptake, drought tolerance, and resistance to root pathogens, but not directly resistance to insects.

48 Easy

48 of 122

Remembering +4 | -1

The residue left after methane production from cattle dung is

View answer and explanation

Correct option: C

Used as manure

Option C (Used as manure) is correct because the residue from biogas production is rich in nutrients and can be used as a fertilizer.

49 Hard

49 of 122

Remembering +4 | -1

Boletus, Glomus and Anabaena, all are

View answer and explanation

Correct option: D

Biofertilizers

Option D (Biofertilizers) is correct because Boletus and Glomus are mycorrhizal fungi that enhance nutrient uptake, and Anabaena is a cyanobacterium that fixes nitrogen, all contributing to plant growth as biofertilizers.

50 Easy

50 of 122

Understanding +4 | -1

Which of the following is a wrong matching of a microbe and its industrial product?

View answer and explanation

Correct option: C

Clostridium acedobutylicum – Lactic acid

Option C is the wrong matching because Clostridium acetobutylicum is primarily known for producing butanol and acetone, not lactic acid.

51 Easy

51 of 122

Remembering +4 | -1

Which of the given household product is obtained by using only bacteria?

View answer and explanation

Correct option: C

Dosa

Option C (Dosa) is correct because the batter used to make dosa is fermented by bacteria.

52 Easy

52 of 122

Understanding +4 | -1

Identify the mismatched pair.

View answer and explanation

Correct option: C

Streptokinase - Blood-cholesterol lowering agent.

Option C is the mismatched pair because Streptokinase is a clot-buster (thrombolytic agent), not a blood-cholesterol lowering agent.

53 Hard

53 of 122

Understanding +4 | -1

Assertion : Use of fertilisers greatly enhances
productivity.

Reason : Irrigation is very important to
increase crop productivity

View answer and explanation

Correct option: B

If both Assertion and Reason are true but Reason
is not the correct explanation of Assertion

Option B is correct because both the assertion and the reason are true, but the reason doesn't explain why fertilizers enhance productivity.

54 Medium

54 of 122

Remembering +4 | -1

Microbes can be found in?

View answer and explanation

Correct option: D

All

Option D (All) is correct because microbes are adaptable and can survive in extreme conditions such as thermal vents, deep soil, and high acidic environments.

55 Medium

55 of 122

Understanding +4 | -1

Methanogens, particularly Methanobacterium grow anaerobically on cellulosic material and produce
I. methane
II. carbon dioxide
III. oxygen
IV. ethane
Choose the correct option

View answer and explanation

Correct option: A

I and II

The correct answer is A (I and II) because methanogens produce methane and carbon dioxide when growing anaerobically on cellulosic material.

56 Medium

56 of 122

Understanding +4 | -1

Trichoderma species, free living fungi, are present in root ecosystems are potentially useful as

View answer and explanation

Correct option: A

Biopesticides

Option A (Biopesticides) is correct because Trichoderma species are known for their ability to control plant pathogens, making them useful as biopesticides.

57 Easy

57 of 122

Remembering +4 | -1

The chemical substances produced by some microbes, which can kill or retard the growth of other microbes are called

View answer and explanation

Correct option: C

Antibiotics

Option C (Antibiotics) is correct because antibiotics are chemical substances produced by microbes that inhibit or kill other microbes.

58 Easy

58 of 122

Remembering +4 | -1

Bacillus thuringiensis is used as

View answer and explanation

Correct option: B

Biopesticide

Option B (Biopesticide) is correct because Bacillus thuringiensis (Bt) produces toxins that are harmful to certain insects, making it an effective biopesticide.

59 Medium

59 of 122

Remembering +4 | -1

Which role is played by Lactobacillus in our stomach?

View answer and explanation

Correct option: C

Beneficial

Option C (Beneficial) is correct because *Lactobacillus* in the stomach aids in digestion and provides other health benefits.

60 Medium

60 of 122

Remembering +4 | -1

The technology of biogas production was developed in India mainly due to the efforts of

View answer and explanation

Correct option: D

Both (1) and (2)

Option D (Both (1) and (2)) is correct because both the Indian Agricultural Research Institute (IARI) and the Khadi and Village Industries Commission (KVIC) contributed significantly to biogas technology development in India.

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