Microbes in Human Welfare NEET Test: Master Biology MCQs

Microbes in Human Welfare NEET Test: Master Biology for NEET 2025
📚 Introduction: Microbes in Human Welfare NEET Test
The Microbes in Human Welfare NEET Test is a comprehensive quiz designed to help NEET aspirants strengthen their understanding of this crucial biology chapter. The Microbes in Human Welfare topic covers a wide array of concepts related to the beneficial uses of microbes in industries, agriculture, medicine, and environmental management. This quiz not only tests your knowledge but also prepares you for the NEET 2025 examination by offering multiple-choice questions (MCQs) that align with the latest NEET syllabus.

Microbes, though microscopic, play a macroscopic role in our lives. They are pivotal in the production of antibiotics, biofertilizers, biopesticides, and biogas. Understanding these concepts is vital for NEET Biology as questions from this chapter often appear in the exam.

🌟 Why Take the Microbes in Human Welfare NEET Test?
The Microbes in Human Welfare NEET Test offers a platform to assess your preparedness for the NEET exam. The test includes:

Chapter-Specific MCQs: Focused on microbial roles in industry, agriculture, and medicine.
Previous Year Questions (PYQs): Practice real NEET questions from past exams.
Detailed Explanations: Each answer comes with clear explanations, helping you learn from mistakes.
Performance Analysis: Identify strengths and weaknesses to focus on targeted revision.
🧬 Key Topics Covered in Microbes in Human Welfare NEET Test
This test covers all important subtopics, including:

Antibiotic Production: Understand how penicillin and other antibiotics are produced using microbes.
Biofertilizers and Biopesticides: Learn how microbes support sustainable agriculture by promoting plant growth and controlling pests.
Microbes in Industry: From fermentation in food production to enzyme manufacturing, microbes play a crucial role.
Biogas Production: Explore the role of anaerobic bacteria in waste management and energy generation.
Environmental Management: How microbes assist in sewage treatment and bioremediation.
📊 Take the Microbes in Human Welfare NEET Test
Ready to test your knowledge? Take our Microbes in Human Welfare NEET Test now! This quiz includes:

20+ Multiple-Choice Questions (MCQs) based on NCERT and PYQs.
Real-time Feedback: Get immediate insights into your performance.
Difficulty Levels: Questions range from basic to advanced, catering to all learners.
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📈 How to Prepare for Microbes in Human Welfare for NEET 2025?
To excel in this chapter and ace the NEET exam, follow these tips:

Thoroughly Read NCERT: Most NEET questions are NCERT-based, so focus on all examples and highlighted points.
Make Short Notes: Create flashcards or summaries of key concepts like antibiotics, biofertilizers, and biogas production.
Regular Revision: Go over your notes and study material frequently to retain information.
Practice Previous Year Questions: This will help you understand the exam pattern and important topics.
Take Mock Tests: The Microbes in Human Welfare NEET Test on capsuleeducation.in is a great way to evaluate your preparation.

💡 Interesting Facts About Microbes in Human Welfare
Penicillin, the first antibiotic, was discovered by Alexander Fleming through a mold called Penicillium notatum.
Rhizobium bacteria help in nitrogen fixation, enhancing soil fertility.
Methanogens, a type of microbe, are instrumental in biogas production from organic waste.
❓ FAQs: Microbes in Human Welfare NEET Test
1. How many questions from Microbes in Human Welfare are expected in NEET?
Generally, 1-2 questions appear in the NEET biology section, often focusing on applications of microbes.

2. Is NCERT enough for Microbes in Human Welfare?
Yes, NCERT is sufficient, but practicing MCQs and PYQs will enhance your exam readiness.

3. What are the key topics to focus on for NEET?
Focus on antibiotic production, biofertilizers, biogas production, and waste management techniques using microbes.

🔗 Related NEET Chapter Tests:
Biotechnology and Its Applications Test
Photosynthesis in Higher Plants Quiz
Cell Cycle and Cell Division Practice MCQs
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Results

#1. Primary treatment of sewage waste involves which of the following processes?

Filtration and incubation

Sedimentation and decantation

Filtration and sedimentation

All of these

Answer: (3) Filtration and sedimentation
Explanation: Primary treatment typically involves filtration to remove large solids and sedimentation to settle out smaller particles.

#2. Different varieties of cheese are typically identified by their: (a) Texture (b) Flavor (c) Taste (d) Source Which combination of factors best describes how cheese varieties are known?

(b) and (c)

(a) and (c)

(a), (b), and (c)

(b), (c), and (d)

Answer: (3) (a), (b), and (c)
Explanation: The distinct textures, flavors, and tastes of cheese define its variety. The source of cheese is also important, but not as crucial in this context.

#3. Given below are three statements (a) – (c) each with one or more blanks. Select the option which correctly fills the blanks in the statements. Statements: (a) ____ a traditional drink of some parts of South India is made by fermenting sap from palms. (b) Citric acid is obtained through the fermentation carried out by _ and _ on sugary syrups. (c) In ____, the fungus forms a mantle on the surface of the roots.

(a) – Toddy; (b) – Aspergillus niger, Mucor; (c) – ectomycorrhiza

(a) – Wine; (b) – Acetobacter aceti, Yeast; (c) – endomycorrhiza

(a) – Beer; (b) – Aspergillus niger, Morrel; (c) – ectomycorrhiza

(a) – Rum; (b) – Clostridium butylicum, Agaricus; (c) – endomycorrhiza

Answer: (1) (a) – Toddy; (b) – Aspergillus niger, Mucor; (c) – ectomycorrhiza
Explanation: Toddy is a traditional drink made from palm sap. Aspergillus niger and Mucor are used in citric acid production, and ectomycorrhiza is a type of mycorrhiza where the fungus forms a mantle around the plant roots.

#4. The remaining major part of activated sludge is pumped into large tanks called ________.

aerobic fermenters

anaerobic fermenters

aerobic sludge digesters

anaerobic sludge digesters

Answer: (4) anaerobic sludge digesters
Explanation: In anaerobic sludge digesters, the remaining organic matter in activated sludge is decomposed without oxygen.

#5. Which of the following statements for sewage is correct?

Municipal wastewater whose major component is human excret

It contains large amount of organic matter and non-pathogenic microbes.

It can be discharged directly into natural water bodies like rivers and streams.

It is generated in less quantity in cities and villages as compared to towns.

Answer: (1) Municipal wastewater whose major component is human excreta.
Explanation: Sewage is primarily composed of human excreta, along with other organic waste and wastewater.

#6. Which of the following statements is true about biofertilizers and microorganisms? (a) All cyanobacteria are nitrogen-fixing organisms. (b) Biofertilizers mainly consist of bacteria, fungi, and cyanobacteria. (c) Azospirillum and Azotobacter are non-symbiotic nitrogen fixers. (d) Microbes like bacteria and fungi can form visible colonies on nutrient media but are too small to be seen with the naked eye

All are correct

All are wrong

(a), (c) and (d) are wrong

Only (a) is wrong

Answer: (3) (a), (c) and (d) are wrong
Explanation: Not all cyanobacteria fix nitrogen, and Azospirillum and Azotobacter are non-symbiotic nitrogen fixers, meaning they don’t form associations with plants. Microbes are often too small to be seen without a microscope.

#7. Fill in the blanks: (a) The dough used to prepare idli and dosa is fermented by ____ and _. The puffy appearance of dough is due to the release of _ by these microorganisms. (b) Microbes are also used in the commercial production of certain organic acids. Butyric acid is produced by and lactic acid is produced by ____.

(a) – Streptococcus faecalis, Pediococcus cerevisiae, CO2; (b) – Clostridium butylicum, Lactobacillus

(a) – Agricus faecalis, Pediococcus cerevisiae, O2; (b) – Clostridium butylicum, Lactobacillus

(a) – Streptococcus faecalis, Pediococcus cerevisiae, CO2; (b) – Bacillus, Lactobacillus

(a) – Streptococcus faecalis, Spirulina, CO2; (b) – Clostridium butylicum, Lactobacillus

Answer: (1) (a) – Streptococcus faecalis, Pediococcus cerevisiae, CO2; (b) – Clostridium butylicum, Lactobacillus
Explanation: The microorganisms involved in fermentation of dough release carbon dioxide, contributing to its puffy texture. Butyric acid and lactic acid are produced by specific microbes.

#8. Statins work by:

allosteric inhibition of the enzyme responsible for cholesterol synthesis.

competitive inhibition of the enzyme responsible for cholesterol synthesis.

irreversible inhibition of the enzyme responsible for cholesterol synthesis.

None of these.

Answer: (2) competitive inhibition of the enzyme responsible for cholesterol synthesis.
Explanation: Statins inhibit HMG-CoA reductase, the enzyme involved in the production of cholesterol, by competitively blocking its active site.

#9. Which of the following best describes biofertilizers?

Biofertilizers increase dependence on chemical fertilizers.

Biofertilizers are organisms that enrich soil nutrient quality.

Biofertilizers include potash, phosphatic, and nitrogenous chemical compounds.

Biofertilizers deplete soil nutrients over time.

Answer: (2) Biofertilizers are organisms that enrich soil nutrient quality.
Explanation: Biofertilizers help enrich the soil by fixing nitrogen and promoting plant growth through symbiotic relationships.

#10. Which of the following beliefs would an organic farmer disagree with?

The more variety a landscape has, the more sustainable it is.

Insects called pests should be controlled by chemical insecticides and pesticides.

Plant diseases and pests should be managed through chemical means.

Pest eradication is undesirable because pests serve as food or hosts for beneficial insects.

Answer: (2) Insects called pests should be controlled by chemical insecticides and pesticides.
Explanation: Organic farmers avoid chemical pesticides and instead rely on natural pest control methods and biodiversity.

#11. Which one of the following is an example of carrying out biological control of pests/disease using microbes?

Trichoderma sp. against certain plant pathogens

Nucleopolyhedrovirus (NPV) against white rust in Brassica

Bt cotton to increase cotton yield.

Lady bird beetle against aphids in mustard

Answer: (1) Trichoderma sp. against certain plant pathogens
Explanation: Trichoderma species are used in biological control of plant pathogens.

#12. Identify the incorrect statement. (a) Bacillus thuringiensis are available in sachets as dried spores which are mixed with kerosene and sprayed onto vulnerable plants. (b) B. thuringiensis are used to control butterfly caterpillars, but leave other insects unharmed. (c) The toxin of B. thuringiensis is released in the blood of larvae and the larvae get killed. (d) By the development of methods of genetic engineering B. thuringiensis toxin genes have been introduced into plants.

(a) and (b)

(b) and (c)

(a) and (c)

(b) and (d)

Answer: (3) (a) and (c)
Explanation: While Bacillus thuringiensis (Bt) toxins are used to control certain pests, they do not release toxins into the blood of larvae but affect the gut. Additionally, they are not typically mixed with kerosene for spraying.

#13. Which of the following describes Swiss cheese?

Ripened, moisture content 45%, hard cheese

Large holes, moisture content < 45%, hard cheese

Processed, large holes, moisture content 50%

Raw cheese, semisoft, large holes

Answer: (2) Large holes, moisture content < 45%, hard cheese
Explanation: Swiss cheese is characterized by its large holes formed during fermentation and has a moisture content below 45%, making it a harder cheese.

#14. Treatment of wastewater is done by the

photoautotrophic microbes, naturally present in sewage.

chemoautotrophic microbes, naturally present in sewage.

heterotrophic microbes naturally present in sewage.

heterotrophic microbes inoculated in the sewage from outside only.

Answer: (3) heterotrophic microbes naturally present in sewage.
Explanation: Heterotrophic microbes are the primary agents in the biological treatment of sewage, as they break down organic matter.

#15. Once BOD from the sewage is reduced significantly, the flocs are allowed to sediment and it is known as ___________.

primary sludge

secondary sludge

activated sludge

inactivated sludge

Answer: (2) secondary sludge
Explanation: After BOD reduction, the flocs settle as secondary sludge, which is then treated further.

#16. The concept of sustainable agriculture focuses on:

Minimizing biopesticides

Greater dependence on new crops

Least use of biofertilizers

Using spores of Bacillus thuringiensis for pest control

Answer: (1) Minimizing biopesticides
Explanation: Sustainable agriculture seeks to balance pest control with minimal environmental impact, reducing dependency on synthetic chemicals.

#17. The first antibiotic was discovered accidentally by (a) while working on (b). The correct answer is:

(a) – Waksman; (b) – Streptococcus

(a) – Fleming; (b) – Penicillium notatum

(a) – Waksman; (b) – Bacillus brevis

(a) – Fleming; (b) – Staphylococci

Answer: (2) (a) – Fleming; (b) – Penicillium notatum
Explanation: Alexander Fleming discovered penicillin, the first antibiotic, by chance while working with Penicillium notatum.

#18. Consider the following statements about organic farming and select which are true (T) or false (F). (a) It produces food crops rich in lipids, vitamins, and iron. (b) It uses biofertilizers that increase soil fertility. (c) It uses more chemical fertilizers and pesticides. (d) It raises unpolluted crops with the help of bacteria, fungi, and cyanobacteria.

T T F F

F T F T

T F T F

T F F F

Answer: (1) T T F F
Explanation: Organic farming uses biofertilizers and reduces the use of chemical fertilizers and pesticides. It promotes sustainable practices for producing nutrient-rich, unpolluted crops.

#19. What is the mode of bacterial resistance against antibiotics?

Development of thick mucilaginous layer

Alteration of cell membrane

Mutation in bacteria

All of these

Answer: (4) All of these
Explanation: Bacteria can develop resistance through various mechanisms, including mutations, alteration of the cell membrane, and the production of a mucilaginous layer that prevents the drug from entering the cell.

#20. Identify the incorrect statement with respect to biogas plant.

It consists of a concrete tank, 10–15ft deep in which bio-wastes are collected and slurry of dung is fed.

A floating cover is placed over the slurry, which keeps on rising as the gas is consumed in the tank.

It has an outlet, which is connected to a pipe to supply biogas to nearby houses.

The spent slurry is removed and may be used as fertiliser.

Answer: (2) A floating cover is placed over the slurry, which keeps on rising as the gas is consumed in the tank.
Explanation: In a biogas plant, the floating cover rises as biogas is produced, not as gas is consumed. The cover collects the gas produced.

#21. Which of the following benefits are associated with mycorrhizae? (a) Protection against root-borne pathogens (b) Enhanced tolerance to salinity and improved phosphorus absorption (c) Increased resistance to drought (d) Overall growth and development of plants is boosted

(a) and (b)

(b) and (c)

All of these

Answer: (4) All of these
Explanation: Mycorrhizae provide various benefits to plants, including resistance to root-borne pathogens, tolerance to salinity and drought, and an overall increase in plant growth and development.

#22. Which of the following statement is incorrect with respect to pectinases?

They are used in clearing of fruit juices.

They are used in chill proofing beer and whisky.

They are obtained from Byssochlamysfulva.

They are used in retting of fibres.

Answer: (3) They are obtained from Byssochlamysfulva.
Explanation: Pectinases are typically obtained from fungi such as Aspergillus or Trichoderma species, not Byssochlamysfulva.

#23. Which of the following is included in biopesticides?

Viruses and bacteria only

Viruses, bacteria and fungi

Viruses, bacteria, fungi and protozoa

Viruses, bacteria and protozoa

Answer: (2) Viruses, bacteria and fungi
Explanation: Biopesticides include microorganisms such as viruses, bacteria, and fungi used to control pests.

#24. The puffed-up texture of dosa and idli dough is a result of:

Fermentation by bacteria and the production of O2

Hydrolysis by bacteria and the production of CO2

Fermentation by bacteria and the production of CO2

Hydrolysis by bacteria and the production of O2

Answer: (3) Fermentation by bacteria and the production of CO2
Explanation: In the preparation of dosa and idli, bacteria ferment the dough, producing CO2 which causes it to rise and become fluffy.

#25. The drugs commonly administered before and after organ transplants are-

Immunomodulators.

Immunosuppressants.

Vaccinations.

Anabolic steroids.

Answer: (2) Immunosuppressants.
Explanation: Immunosuppressants are used to prevent the immune system from rejecting transplanted organs.

#26. What are flocs?

Masses of anaerobic bacteria

Masses of aerobic fungi only

Masses of anaerobic bacteria and fungi

Masses of aerobic bacteria associated with fungal filaments

Answer: (4) Masses of aerobic bacteria associated with fungal filaments
Explanation: Flocs are aggregates of bacteria, often with fungal filaments, that help in wastewater treatment by breaking down organic matter.

#27. Streptokinase is a medicinal enzyme that is used to:

inhibit bacterial growth in body fluids.

dissolve blood clots in blood vessels.

weaken blood vessel walls.

promote the formation of blood clots.

Answer: (2) dissolve blood clots in blood vessels.
Explanation: Streptokinase is used to break down fibrin in blood clots, a key treatment for conditions like heart attacks or strokes.

#28. Which of the following are advantages of mycorrhizal associations for plants? (a) Resistance to root-borne pathogens (b) Enhanced tolerance to salinity and improved phosphorus absorption (c) Increased drought resistance (d) Overall improvement in plant growth and development

(a) and (b)

(b) and (c)

All of these

Answer: (4) All of these
Explanation: Mycorrhizae provide multiple benefits, including protection against root-borne pathogens, enhanced nutrient uptake (especially phosphorus), tolerance to environmental stresses like drought and salinity, and overall improved plant growth.

#29. Which statement about mycorrhizae is incorrect? (a) In ectomycorrhizae, the association between the fungus and the plant is less intimate than in endomycorrhizae. (b) Mycorrhizal associations may have played an important role in the evolution of land plants. (c) The relationship between the fungus and the plant is a mutualistic symbiosis. (d) The fungal partner is only associated with the roots of higher plants, such as angiosperms. (e) Only advanced plants, like angiosperms, possess mycorrhizae.

Only (e)

Only (d)

Only (a) and (c)

Only (b) and (e)

Answer: (1) Only (e)
Explanation: Mycorrhizal associations are not exclusive to angiosperms and can also occur in other plant groups like gymnosperms and ferns.

#30. What happens to activated sludge?

It is generally released into natural water bodies like rivers and streams.

It is completely pumped back into aeration tank to serve as inoculum.

The major part of the sludge is pumped into large tanks called anaerobic sludge digesters.

It undergoes sequential filtration.

Answer: (3) The major part of the sludge is pumped into large tanks called anaerobic sludge digesters.
Explanation: Activated sludge is sent to anaerobic digesters for further treatment and decomposition.

#31. Which of the following is false regarding the functions of mycorrhiza?

More susceptibility to diseases

Resistance to root-borne pathogens

Tolerance to salinity and drought

Overall increase in plant growth and development

Answer: (1) More susceptibility to diseases
Explanation: Mycorrhizae generally provide resistance to diseases, rather than increasing susceptibility.

#32. A drug used for (a) patients is obtained from the species of (b) organism. The correct pair for the blanks is:

Swine flu – Monascus

AIDS – Pseudomonas

Heart – Penicillium

Organ transplant – Trichoderma

Answer: (4) Organ transplant – Trichoderma
Explanation: Cyclosporin A, a drug used in organ transplants, is produced by the fungus Trichoderma polysporum.

#33. Which of the following statements is correct? (a) Single cell protein is rich in high-quality proteins but poor in fat. (b) BOD is the amount of oxygen that would be consumed if all the inorganic matter in one litre of water were oxidized by bacteria. (c) Trichoderma is a free-living fungus that produces effective biocontrol agents of several pathogens. (d) Baculoviruses are pathogens that attack insects and other arthropods. (e) Bacillus thuringiensis is the first used biopesticide. (f) Lactase enzyme is used in alcoholic fermentation. (g) Mycorrhiza is a symbiotic association between fungi, for example, Glomus and vascular plants.

(b), (c), (f) and (g)

(a), (d) and (f)

(a), (c), (d), (e) and (g)

(b) and (f)

Answer: (3) (a), (c), (d), (e) and (g)
Explanation:

Statement (a) is correct: Single cell protein is rich in protein and low in fat.

Statement (c) is correct: Trichoderma is a free-living fungus used for biocontrol.

Statement (d) is correct: Baculoviruses attack insects and arthropods.

Statement (e) is correct: Bacillus thuringiensis was the first biopesticide.

Statement (g) is correct: Mycorrhiza is a symbiotic relationship between fungi and plants.

#34. Biofertilizers are organisms that:

Increase dependence on chemical fertilizers.

Enrich the nutrient quality of soil.

Include potash, phosphatic, and nitrogenous organic and chemical compounds.

Are used regularly in fields to deplete soil nutrients.

Answer: (2) Enrich the nutrient quality of soil
Explanation: Biofertilizers improve the soil’s nutrient content naturally, reducing reliance on chemical fertilizers.

#35. Which microbe produces butyric acid?

Saccharomyces cerevisiae

Clostridium butylicum

Aspergillus niger

Propionibacterium shermanii

Answer: (2) Clostridium butylicum
Explanation: Clostridium butylicum is known for producing butyric acid during its metabolic processes.

#36. What beneficial role does LAB play in the human stomach?

It causes souring of milk, decreasing nutritional quality.

It increases vitamin D production.

It checks the growth of disease-causing microbes.

It produces alkali, coagulating and partially digesting milk proteins.

Answer: (3) It checks the growth of disease-causing microbes
Explanation: LAB in the stomach help prevent harmful microbes from proliferating, aiding digestion and improving gut health.

#37. Which statement regarding mycorrhizal fungi is incorrect? (a) In ectomycorrhizae, the association between the fungus and plant is less intimate than in endomycorrhizae. (b) Mycorrhizal associations may have played a crucial role in the evolution of land plants. (c) Mycorrhizae form mutualistic symbiotic relationships with plants. (d) Fungal partners are found only in the roots of angiosperms. (e) Only modern plants, such as angiosperms, form mycorrhizal associations.

Only (e)

Only (d)

Only (a) and (c)

Only (b) and (e)

Answer: (1) Only (e)
Explanation: Mycorrhizal associations are not exclusive to angiosperms; they are found in various plant groups, including gymnosperms and ferns. The statement that only advanced plants form mycorrhizal relationships is incorrect.

#38. Trichoderma polysporum yields a bioactive compound used as an immunosuppressive agent in organ transplantation. This compound is:

Polysporin

Cyclosporin

Pentacyclosporin

Cyclohydrosporin

Answer: (2) Cyclosporin
Explanation: Cyclosporin is an immunosuppressive drug derived from Trichoderma polysporum, used to prevent organ rejection after transplants.

#39. Pro-life chemicals with reference to human beings:

are regarded as one of the most significant discoveries of the twenty-first century.

have rarely contributed to human welfare.

are produced by some plants and all animals.

can kill or retard the growth of disease-causing microbes.

Answer: (4) can kill or retard the growth of disease-causing microbes.
Explanation: Pro-life chemicals are those that help prevent or control diseases by inhibiting harmful microbes.

#40. Which of the following statements are false? (a) Word antibiotic is a misnomer. Anti is a Greek word that means against life (in the context of disease-causing organisms) whereas with reference to human beings they are pro-life and not against. (b) Flocs are masses of bacteria with interwoven fungal filaments forming mesh-like structures. (c) Components in biogas are carbon dioxide (CO2, 25–35%), hydrogen (H2, 1–5%), nitrogen (N2, 2–7%) and hydrogen sulphide (H2S, traces).

(a) and (b)

(b) and (c)

All of these

None of these

Answer: (3) All of these
Explanation:

Statement (a) is true: The term “antibiotic” is indeed a misnomer because it means “against life,” but antibiotics are pro-life in the context of controlling harmful microorganisms.

Statement (b) is false: Flocs are not a combination of fungal filaments and bacteria; they are bacterial masses.

Statement (c) is correct: The components of biogas include CO2, H2, and H2S in the specified amounts.

#41. The enzyme (a) is used to remove blood clots in patients who have undergone (b) leading to heart attacks. The correct answer is:

(a) – Streptokinase; (b) – Myocardial infarction

(a) – Lipase; (b) – Arteriosclerosis

(a) – Proteases; (b) – Myocardial infarction

(a) – Pectinases; (b) – Atherosclerosis

Answer: (1) (a) – Streptokinase; (b) – Myocardial infarction
Explanation: Streptokinase is used to dissolve blood clots in patients with heart attacks (myocardial infarction).

#42. Mycorrhizal associations are formed by fungi and plants. The genus is commonly involved in forming these associations, and it absorbs from the soil and transfers it to the plant.

Aspergillus; sulphur

Agaricus; nitrogen

Boletus; boron

Glomus; phosphorus

Answer: (4) Glomus; phosphorus
Explanation: The genus Glomus is well-known for forming mycorrhizal associations, where it helps plants by absorbing phosphorus from the soil and transferring it to the plants.

#43. Which of the following statements is incorrect about mycorrhizae?

The fungal symbiont absorbs phosphorus from the soil and transfers it to plants.

The plant symbionts exhibit resistance to root-borne pathogens, tolerance to salinity and drought, and increase plant growth and development.

The plant symbionts show resistance to herbicides.

None of these.

Answer: (3) The plant symbionts show resistance to herbicides
Explanation: Mycorrhizae enhance plant health but do not directly confer resistance to herbicides.

#44. Before disposal of municipal wastewater and sewage, they are treated in STP in order to make it less polluting. The stage of treatment which comprises use of anaerobic sludge digester is

primary.

secondary.

tertiary.

quaternary.

Answer: (2) secondary.
Explanation: The anaerobic sludge digester is typically used during the secondary treatment of wastewater to break down organic matter and reduce the sludge.

#45. The large holes in Swiss cheese are due to CO2 production by which microbe?

Lactobacillus

Saccharomyces cerevisiae

Propionibacterium shermani

Aspergillus niger

Answer: (3) Propionibacterium shermanii
Explanation: Propionibacterium shermanii produces CO2 during fermentation, which forms the characteristic holes in Swiss cheese.

#46. Given below are two statements (a) – (b) each with one or more blanks. Select the option which correctly fills the blanks in the statements. Statements: (a) Statins produced by the yeast _____ have been commercialized as blood cholesterol-lowering agents. (b) contains insecticidal crystal proteins thurioside, which is a stomach poison and highly insect-specific.

(a) – Monascus purpureus; (b) – Bacillus thuringiensis

(a) – Leuconostoc citrovorum; (b) – Mucorpusillus

(a) – Streptococcus thermophilus; (b) – Lactobacillus bulgaricus

(a) – Hordeum vulgare; (b) – Humulus lupulus

Answer: (1) (a) – Monascus purpureus; (b) – Bacillus thuringiensis
Explanation: Monascus purpureus is used to produce statins, which lower blood cholesterol. Bacillus thuringiensis produces insecticidal proteins, including thurioside, used as a biopesticide.

#47. Given below are two statements (a) – (b) each with one or more blanks. Select the option which correctly fills the blanks in the statements. Statements: (a) Microbes consume the major part of organic matter in the effluent and reduce of sewage. (b) Certain bacteria which grow anaerobically on cellulosic material produce large amounts of methane along with CO2 and H2. The bacteria are commonly called and one such common bacterium is ______.

(a) – CO2 demand; (b) – methanogens, Methanobacterium

(a) – carbon; (b) – methanogens, Methanobacterium

(a) – biochemical oxygen demand; (b) – methanogens, Methanobacterium

(a) – biochemical oxygen demand; (b) – methanogens, Methylokorusinfernorum

Answer: (3) (a) – biochemical oxygen demand; (b) – methanogens, Methanobacterium
Explanation: Microbes reduce the biochemical oxygen demand (BOD) in sewage by decomposing organic matter. Methanogens are anaerobic bacteria that produce methane, and Methanobacterium is a common example.

#48. Trichoderma has been proved as a useful microorganism for

biological control of soil-borne plant pathogens.

bioremediation of contaminated soils.

reclamation of waste lands.

gene transfer in higher plants.

Answer: (1) biological control of soil-borne plant pathogens.
Explanation: Trichoderma is commonly used for biological control of soil-borne plant diseases and as a biocontrol agent for improving plant health.

#49. An important yeast, often referred to as baker’s yeast, is central to food production and was the first unicellular eukaryotic organism to have its entire genome sequenced. This yeast is:

Schizosaccharomyces

Saccharomycoides

Ashbya

Saccharomyces cerevisiae

Answer: (4) Saccharomyces cerevisiae
Explanation: Saccharomyces cerevisiae is widely used in baking and brewing. It was the first eukaryotic genome to be sequenced, making it significant in genetics and biotechnology.

#50. Which of the following is incorrect regarding biofertilizers?

VAM is a biofertilizer

Azolla and BGA are the best biofertilizers.

Synthetic fertilizers do not cause pollution.

Probiotics are live microbial food supplements.

Answer: (3) Synthetic fertilizers do not cause pollution.
Explanation: Synthetic fertilizers can contribute to pollution, particularly through nutrient runoff that leads to water eutrophication.

Finish

Results

#1. Primary treatment of sewage waste involves which of the following processes?

#2. Different varieties of cheese are typically identified by their: (a) Texture (b) Flavor (c) Taste (d) Source Which combination of factors best describes how cheese varieties are known?

#4. The remaining major part of activated sludge is pumped into large tanks called ________.

#5. Which of the following statements for sewage is correct?

#8. Statins work by:

#9. Which of the following best describes biofertilizers?

#10. Which of the following beliefs would an organic farmer disagree with?

#11. Which one of the following is an example of carrying out biological control of pests/disease using microbes?

#13. Which of the following describes Swiss cheese?

#14. Treatment of wastewater is done by the

#15. Once BOD from the sewage is reduced significantly, the flocs are allowed to sediment and it is known as ___________.

#16. The concept of sustainable agriculture focuses on:

#17. The first antibiotic was discovered accidentally by (a) while working on (b). The correct answer is:

#19. What is the mode of bacterial resistance against antibiotics?

#20. Identify the incorrect statement with respect to biogas plant.

#21. Which of the following benefits are associated with mycorrhizae? (a) Protection against root-borne pathogens (b) Enhanced tolerance to salinity and improved phosphorus absorption (c) Increased resistance to drought (d) Overall growth and development of plants is boosted

#22. Which of the following statement is incorrect with respect to pectinases?

#23. Which of the following is included in biopesticides?

#24. The puffed-up texture of dosa and idli dough is a result of:

#25. The drugs commonly administered before and after organ transplants are-

#26. What are flocs?

#27. Streptokinase is a medicinal enzyme that is used to:

#28. Which of the following are advantages of mycorrhizal associations for plants? (a) Resistance to root-borne pathogens (b) Enhanced tolerance to salinity and improved phosphorus absorption (c) Increased drought resistance (d) Overall improvement in plant growth and development

#30. What happens to activated sludge?

#31. Which of the following is false regarding the functions of mycorrhiza?

#32. A drug used for (a) patients is obtained from the species of (b) organism. The correct pair for the blanks is:

#34. Biofertilizers are organisms that:

#35. Which microbe produces butyric acid?

#36. What beneficial role does LAB play in the human stomach?

#38. Trichoderma polysporum yields a bioactive compound used as an immunosuppressive agent in organ transplantation. This compound is:

#39. Pro-life chemicals with reference to human beings:

#41. The enzyme (a) is used to remove blood clots in patients who have undergone (b) leading to heart attacks. The correct answer is:

#42. Mycorrhizal associations are formed by fungi and plants. The genus ________ is commonly involved in forming these associations, and it absorbs ________ from the soil and transfers it to the plant.

#43. Which of the following statements is incorrect about mycorrhizae?

#44. Before disposal of municipal wastewater and sewage, they are treated in STP in order to make it less polluting. The stage of treatment which comprises use of anaerobic sludge digester is

#45. The large holes in Swiss cheese are due to CO2 production by which microbe?

#48. Trichoderma has been proved as a useful microorganism for

#49. An important yeast, often referred to as baker’s yeast, is central to food production and was the first unicellular eukaryotic organism to have its entire genome sequenced. This yeast is:

#50. Which of the following is incorrect regarding biofertilizers?

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#42. Mycorrhizal associations are formed by fungi and plants. The genus is commonly involved in forming these associations, and it absorbs from the soil and transfers it to the plant.