Microbes in Human Welfare — practice questions

235 curated practice questions from Microbes in Human Welfare (Biology NEET, NTA Exams) — 171 easy, 36 medium, 28 hard. Every question includes the final answer free; step-by-step worked solutions with a free account.

• Which of the following is correctly matched for the product produced by them?
• Which of the following microbes is NOT involved in the preparation of household products? Aspergillus niger…
• Read the following statement having two blanks (A and B) “A drug used for patients is obtained from a species of the…
• Who coined the term ”antibiotics'' [MHCET 2000; CBSE PMT 2003; BHU 2004; Pb. PMT 2004] Or Streptomycin was first…
• Given below are two statements: Statement I : Small part of activated sludge can be utilized as inoculum in aeration…
• Biofertilizers include [NCERT Pg. No. 158] [CBSE PMT 1997, 2001; DPMT 2004; BHU 2008; AIIMS 2013]
• Identify the part of a bio-reactor which is used as a foam breaker from the given figure [NEET 2025]
• Highest number of antibiotics are produced by [MP PMT 2009]
• Third generation pesticides are [CBSE PMT 1998; AFMC 2000]
• Which of the following is put into Anaerobic sludge digester for further sewage treatment [NCERT Pg. No. 154] [NEET…
• Biological control of pests is [NCERT Pg. No. 156] [CBSE PMT 1994; CPMT 2000]
• Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion…
• Biofertilizers include [NCERT Pg. No. 158] [J & K CET 2002; AMU (Med.) 2010]
• Which of the following process is used in the production of cheese and yogurt?
• Monoclonal antibodies are [AIIMS 2010]
• Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…
• Given below are two statements: Statement I: Lactic Acid Bacteria (LAB) in the stomach play a beneficial role by…
• Given below are two statements: Statement I: Penicillin was discovered by Alexander Fleming from the fungus Penicillium…
• The trigger for activation of toxin of Bacillus thuringiensis is [NCERT Pg. No. 178]
• Which among these are produced by distillation of fermented broth (i) Whisky (ii) Wine (iii) Beer (iv) Rum (v) Brandy…
• Given below are two statements: Statement I : Bacteria, cyanobacteria and fungi can be used as Biofertilizers…
• Given below are two statements: Statement I : Anabaena and Nostoc are used as Biofertilizers which help in nitrogen…
• Producer gas differs from biogas in having [MHCET 2004]
• Assertion: In the place of chemical fertilizers, biofertilizers and manure should be used. Reason: Chemical fertilizers…
• Biogas produced by anaerobic fermentation of water biomass consists of [NCERT Pg. No. 154, 155] [CPMT 2005]
• Farmers have reported 50% higher yield of rice by using biofertilizer [CBSE PMT 1993, 98, 99; MP PMT 1997; AMU (Med.)…
• Which of the following is an example of non-distilled alcoholic beverage produced by yeast?
• Agricultural chemicals include [Pb. PMT 2000]
• The puffed up appearance of dough in bakery is due to [NCERT Pg. No. 151]
• Lactic acid bacteria (LAB) at suitable temperature converts milk to curd, which improves its nutritional quality by…
• Which of the following has been covered under the broad patent category [DPMT 2007]
• Which of the following organisms is useful in the preparation of Roquefort cheese?
• Select the correct statement from the following [NCERT Pg. No. 154] [CBSE PMT (Pre.) 2010]
• Which of the following bacteria producing an endotoxin 'thurioside' is used as insecticide for agricultural pest?
• Given below are two statements: Statement I: Biofertilisers are organisms that enrich the nutrient quality of the soil…
• Consider the following statements (A-D) about organic farming (A) Utilizes genetically modified crops like Bt cotton…
• Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…
• Streptokinase produced by bacterium Streptococcus is used for [NEET 2025]
• What happens with BOD of a water body when large amount of the sewage is dumped into that?
• Which one of the following is an example of carrying out biological control of pests/diseases using microbes [NCERT Pg…
• Given below are two statements: one is labeled as Assertion (A) and the other is labeled as Reason (R). Assertion (A) …
• Which raw material is used in fermentation process of making beer [NCERT Pg. No. 152] [Odisha JEE 2005]
• Cheese and Yoghurt are products of the process [NCERT Pg. No. 151] [MP PMT 1994, 2003]
• Dough kept overnight in warm weather becomes soft and spongy because of [NCERT Pg. No. 151] [CBSE PMT 2004]
• Which one of the following is the correctly matched pair of a product and the microorganism responsible for it [NCERT…
• Match the following list of microbes and their importance [NCERT Pg. No. 151, 152, 153] [AIPMT 2015] (A) Saccharomyces…
• Which of the following statements is/are correct? I. Toddy is made by fermenting sap from palms. II. Cheese varieties…
• Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. STATEMENT - 1…
• A genetically engineered micro-organism used successfully in bioremedication of oil spills is a species of [NCERT; CBSE…
• Select the correct group of biocontrol agents [NCERT Pg. No. 157] [NEET 2019]
• The microbe Pseudomonas denitrificans produces Vitamin [MHCET 2015]
• A 'new' variety of rice was patented by a foreign company, though such varieties have been present in India for a long…
• Cheeses are usually classified on the basis of [NCERT Pg. No. 151] [MP PMT 1997]
• Given below are two statements: Statement I : Trichoderma polysporum yields Cyclosporin A which is used as…
• Which of the following is a commercial blood cholesterol lowering agent?
• Streptococcus thermophilus and Lactobacillus bulgaricus are being used for the production of [MP PMT 1997]
• Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. STATEMENT - 1…
• A compound which is produced by an organism and inhibits growth of other organism is called [NCERT Pg. No. 152] [MP PMT…
• Lactobacillus mediated conversion of milk to curd results because of:
• In gobar gas, the maximum amount is that of [NCERT Pg. No. 155, 156] [CBSE PMT 2004; CBSE PMT (Mains) 2012] Or Biogas…
• Ernest chain and Howard Florey’s contribution was [NCERT Pg. No. 152] [KCET 2015]
• Given below are two statements: Statement I: The yeast Saccharomyces cerevisiae is used in the production of beer…
• Study the following statements and select the incorrect ones (i) Physical removal of large and small particles through…
• What would happen if oxygen availability to activated sludge flocs is reduced [NCERT]
• Which of the following is/are true A. Biowar - Biowar is the use of biological weapons against humans and or their…
• Match the microbes in column I with their commercial/ industrial products in column II and choose the correct answer…
• Which of the following is not used as bioweapon [DUMET 2010]
• Saccharomyces is commonly used in the production of [MP PMT 2006; DUMET 2010; CBSE PMT (Pre.) 2011]
• A chemical substance produced by a microorganism for inhibiting the growth of another is:
• Given below are two statements: Statement I : Aeration in secondary treatment allows the growth of flocs. Statement II…
• Given below are two statements Statement I : Bt toxins are insect group specific and coded by a gene cry IAc. Statement…
• Which one of the following is not used in the production of yoghurt [MP PMT 1995, 97, 2002]
• Refer the given flowchart of sewage treatment, accordingly match Column I with Column II and select the correct answer…
• Assertion : Bioenergy is the energy available from biological sources. Reason : Fossil fuels are examples of bioenergy.
• Antibiotics belong to the category of [MP PMT 2000, 04]
• Which of the following statements is/are correct regarding the principles of organic farming? I. Organic farming aims…
• Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion…
• Rennet is used in [MP PMT 2002; VITEEE 2008]
• Which one of the following is a wrong matching of a microbe and its industrial product, while the remaining three are…
• Microbe used for biocontrol of pest butterfly caterpillars is [NCERT Pg. No. 157] [NEET (Karnataka) 2013]
• Given below are two statements: Statement I : ADA deficiency can be cured by bone marrow transplanation. Statement II …
• The phenomenon of using a predator for controlling a pest is [NCERT Pg. No. 156] [CBSE PMT 1996]
• Given below are two statements: Statement I : Ganga Action Plant (GAP) was initiated by the Ministry of Environment and…
• Bt cotton variety that was developed by the introduction of toxin gene of Bacillus thuringiensis (Bt) is resistant to…
• When milk is converted into curd by lactic acid bacteria, content of which vitamin increases
• Conversion of sugar into alcohol during fermentation is due to the direct action of [MP PMT 1994; CPMT 2001; RPMT 2006]
• Among the following pairs of microbes, which pair has both the microbes that can be used as biofertilizers?
• Biogas is a mixture of [NCERT Pg. No. 154] [MHCET 2002; DUMET 2010]
• Bacillus thuringiensis forms protein crystals which contain insecticidal protein. This protein [NCERT Pg. No. 157]…
• Given below are two statements: Statement I : Bt genes have variant depending on targeted insects. Statement II …
• The rejection of organ transplanting in human is prevented by using [NCERT Pg. No. 153] [Kerala CET 2003]
• The micro-organism grown on molasses and sold as a food flavouring substance is [MP PMT 1999]
• One of the following aquatic weed has been exploited for biogas production [CPMT 1995]
• Which part of the tobacco plant is infected by Meloidogyne incognita [NEET (Phase-I) 2016]
• During its formation, bread becomes porous due to the release of CO 2 by the action of:
• Which one is a biofertilizer [BVP 2001]
• During which stage of sewage treatment microbes are used [NCERT Pg. No. 154]
• Given below are two statements: Statement I : Green revolution has come with a cost in form of fertilizers and…
• Streptokinase produced by bacterium Streptococcus is used for
• The most common substrate used in distilleries for the production of ethanol is [CBSE PMT (Pre.) 2011]
• Which one of the following is not biofertilizer [NCERT Pg. No. 158] [CBSE PMT (Pre.) 2011]
• Choose the correct option for the toxic protein produced by B. thuringiensis [NCERT Pg. No. 178] [GUJCET 2014]
• Which part of the tobacco plant is infected by Meloidogyne incognita?
• The solids which settle after primary treatment of sewage are called [NCERT Pg. No. 154]
• The correct sequence of events in a typical biogas plant is: I. Biogas collects under the floating cover II. Spent…
• Germinating barley seeds are employed in the preparation of [NCERT Pg. No. 152]
• Confusion technique uses [DPMT 2001]
• The primary treatment of sewage involves [NCERT Pg. No. 154]
• Which of the following microbes is NOT involved in the preparation of household products (A) Aspergillus niger (B)…
• Yeast is used in the production of [NCERT Pg. No. 151, 152] [CBSE PMT (Pre.) 2012]
• The following apparatus are used for fermentation process. Identify A and B respectively [NCERT Pg. No. 174]
• The purpose of biological treatment of waste-water is to [NCERT Pg. No. 154] [AMU (Med.) 2010]
• cry II Ab and cry I Ab produce toxins that control [NCERT Pg. No. 180] [Kerala PMT 2010]
• Characteristics of biocontrol agents include: I. They are species-specific and narrow spectrum in action. II. They…
• Given below are two statements: Statement I: The fungus Aspergillus niger is commercially used for the production of…
• Given below are two statements: Statement I : Primary treatment leads to formation of primary sludge and effluent…
• Given below are two statements: Statement I : Colostrum provides acquired passive immunity to new born babies…
• Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. STATEMENT - 1…
• Pollution from animal excreta and organic waste from kitchen can be most profitably minimized by:
• Cochineal insect has been used in checking the wild growth of [CBSE PMT 1996]
• The following figure shows a typical biogas plant. Select the right option in which products labelled as A, B and C are…
• Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…
• Which one of the following is being utilized as a source of biodiesel in the Indian countryside [CBSE PMT 2007] Or An…
• The amount of oxygen required by the microbes in the decomposition of organic matter is called [NCERT Pg. No. 154]
• Which of the following plant species you would select for the production of bioethanol [CBSE PMT 2009] Or Which one of…
• Which of the following can be used as a biocontrol agent in the treatment of plant disease [NCERT Pg. No. 157 ] [CBSE…
• Azolla is used as biofertilizer as it has [DPMT 2001; AIIMS 2003]
• Biogas produced by anaerobic decomposition used in combustion is mainly due to presence of:
• Biogas production from cow dung was developed due to efforts of
• Which of the following is wrongly matched in the given table? Microbe Product Application A. Clostridium butyricum…
• Given below are two statements: Statement I: Mycorrhiza is a symbiotic association between fungi and the root nodules…
• Which of the following statement is not true for stirred tank fermentation [Odisha JEE 2005]
• Which of the following pairs of microbial products and their applications is/are correctly matched? I. Cyclosporin A –…
• Given below are two statements: Statement I: The biogas produced in gobar gas plants is used for cooking and lighting…
• A patient brought to a hospital with myocardial infarction is normally immediately given:
• Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. STATEMENT - 1…
• Assertion : Bacillus thuringenesis is toxic to many insects. Reason : It inhibits ion transport in the midgut. [NCERT…
• Methane content of biogas is [BVP 2000]
• The initial step in preparation of beer is [NCERT Pg. No. 152] [MHCET 2015]
• During sewage treatment, biogases are produced, which mainly include:
• For biogas production besides dung which one of the following weed is recommended in our country [Kerala PMT 2004]
• Which of the following is put into anaerobic sludge digester for further sewage treatment?
• Origin of which of the following antibiotics is not a fungus?
• An organism used as biofertilizer for raising soyabean crop is [J & K CET 2010; CBSE PMT (Pre.) 2011] Or Most famous…
• Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. STATEMENT - 1…
• Streptomycin is produced by or from which micro-organism streptomycin is prepared [NCERT; MP PMT 1997, 2001, 04; CPMT…
• Given below are two statements: Statement I: The organic farmer aims to completely eradicate all pest species from the…
• From the statements given below choose the correct statement(s): I. Biofertilisers include bacteria, fungi, and…
• The large vessels for growing microbes on an industrial scale are called [NCERT Pg. No. 151]
• Cyclosporin A, used as immuno suppression agent, is produced from:
• Conversion of milk to curd improves its nutritional value by increasing the amount of
• Which one of the following is a correct statement [NCERT Pg. No. 178] [AIIMS 2005]
• Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion…
• BOD of waste water is estimated by measuring the amount of [NCERT Pg. No. 154]
• Identify the microorganism which is responsible for the production of an immunosuppressive molecule cyclosporin A [NEET…
• Fleming, Chain, and Florey were awarded the Nobel Prize in 1945 for the discovery of [NCERT Pg. No. 152] [MHCET 2001…
• Wastewater treatment generates a large quantity of sludge, which can be treated by [NCERT Pg. No. 154]
• Which one of the following pairs is wrongly matched [NCERT Pg. No. 152] [CBSE PMT 2007]
• Find the incorrect statement [Kerala CET 2005]
• Which one of the following is a wrong matching of a microbe and its industrial product, while the remaining three are…
• Vitamin B 12 is produced directly during the course of fermentation by [MP PMT 2002]
• Given below are two statements. One is labelled as Assertion and the other is labelled as Reason. STATEMENT - 1…
• Select the correct option for the given statements ‘X’, ‘Y’ and ‘Z’ Statement ‘X’ – A transgenic cow, Rosie, produced…
• Which of the following in sewage treatment removes suspended solids [NCERT Pg. No. 154] [NEET 2017]
• Cyclosporin A is given to an organ transplant patient while Bacillus thuringiensis (Bt) is used in crop fields. From…
• Which of the following is maintained for optimum production of vinegar [Odisha JEE 2008]
• A Bioenergy source obtained by fermentation to supplement fossil fuel petrol is [Chd. CET 1998; Odisha JEE 2011]
• After maturation, in primary lymphoid organs, the lymphocytes migrate for interaction with antigens to secondary…
• Biofertilizers [NCERT Pg. No. 157, 158] [BVP 2000]
• Given below are two statements: Statement I : In organic farming, pests are not fully eradicated but kept at minimal…
• Given below are two statements: Statement I: In the secondary treatment of sewage, the vigorous growth of aerobic…
• The site of production of ADA in the body is [NCERT Pg. No. 182]
• Activated sludge should have the ability to settle quickly so that it can [NCERT Pg. No. 154]
• Which weed has been eradicated by biological control [DPMT 1997]
• Golden rice is a transgenic crop of the future with the improved trait for:
• Given below are two statements: Statement I : Primary treatment of sewage involves only physical process. Statement II…
• Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…
• Cheese is prepared from [MP PMT 2001]
• Which of the followings is mainly produced by the activity of anaerobic bacteria on sewage [NCERT; CBSE PMT (Pre.) 2011]
• Monascus purpureus is a yeast used commercially in the production of [NCERT Pg. No. 153] [AMU (Med.) 2010; CBSE PMT…
• Given below are two statements: Statement I: Microbes like bacteria and many fungi can be grown on nutritive media to…
• What gases are produced in anaerobic sludge digesters [NCERT Pg. No. 154] [NEET 2013; CBSE PMT 2014; KCET 2015]
• Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion…
• Read the following statement having two blanks (A and B): "A drug used for ------(A)--------patients is obtained from a…
• Given below are two statements: Statement I : Flow of sewage is from Primary settling tank to Aeration Tank to…
• The vaccine of Hepatitis-B is a [NCERT; MP PMT 2003, 12]
• A nitrogen fixing bacterium that forms a loose assocation with the roots of crop plants is [NCERT Pg. No. 158] [Kerala…
• A collection of plant and seeds having diverse alleles of all the genes of a crop is called:
• Rising of dough is due to [NCERT Pg. No. 151]
• Which of the following is an example of non-distilled alcoholic beverage produced by yeast [NEET 2025]
• Monoclonal antibodies are produced from hybrid cells called hybridomas. The cells employed to obtain these hybridoma…
• Biogas can be a good substitute for [BHU 2000] Or In developing countries, the heaviest demand on forests is for [NCERT…
• If wheat field is inoculated with Rhizobium [Pb. PMT 1998; MP PMT 2007]
• The bacterium Bacillus thuringiensis is widely used in contemporary biology as a/an:
• Curding of milk takes place by [NCERT Pg. No. 151] [ CMC Vellore 1993; MH CET 2006; MP PMT 2011]
• The common nitrogen-fixer in paddy fields is [NCERT Pg. No. 158] [CBSE PMT (Pre.) 2010]
• For which variety of Indian rice, patent was filled by a USA company?
• Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion…
• Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion…
• Which of the following organic acids was produced by fermentation [NCERT Pg. No. 153]
• Which one of the following equipments is essentially required for growing microbes on a large scale, for industrial…
• During Biogas production acetic acid is transformed into the final product by the enzymes of [NCERT Pg. No. 155] [MHCET…
• IPM (Integrated Pest Management) involves [NCERT Pg. No. 157] [CPMT 1998] Or Latest trend in plant disease control is…
• In olden days cheese was prepared by [BVP 2003]
• Biogas produced by fermentation of manure, sewage, cattle dung etc., predominantly comprises:
• Terramycin is obtained from [MP PMT 1995]
• Night blindness can be prevented by use of which crop in a poor country?
• Assertion: Microbes present in the soil serve as the CO sink. Reason: Microbes are capable in conversion of CO into CO…
• From the statements given below choose the correct statement(s): I. Bacillus thuringiensis (Bt) is used to control…
• Assertion : The kneaded flour shows leavening, when yeast is added to it. Reason : Enzymes secreted by yeast cause…
• Which one of the following is used in the baking of the bread [NCERT Pg. No. 151] [MP PMT 2004] Or Baker’s yeast is…
• July 11 is observed as [BHU 2002; AIIMS 2003, 08]
• Find out the pairs, which are correctly matched A. Cyanobacteria - 1 . Biopesticides B. Mycorrhiza - 2 . Solubilization…
• Assertion : Yeasts such as Saccharomyces cerevisiae are used in baking industry. Reason : Carbon dioxide produced…
• Cow dung is appropriately used as [DPMT 2001]
• First antibiotic isolated was [NCERT Pg. No. 152] Or Antibiotics are produced by [ Bihar MDAT 1995]
• Which of the following organism is useful in the preparation of roquefort cheese [NCERT Pg. No. 151] [BHU 2004]
• Given below are two statements: Statement I: Cyclosporin A, an immunosuppressive agent used in organ transplants, is…
• Match List I with List II List- I List- II (A) Clostridium butylicum (I) Ethanol (B) Saccharomyces cerevisiae (II)…
• Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…
• In the sewage treatment, bacterial flocs are allowed to sediment in a settling tank. This sediment is called as [NCERT…
• ‘Flocs’ refer to [NCERT Pg. No. 154] [KCET 2018]
• Lactobacillus mediated conversion of milk to curd results because of [NCERT Pg. No. 151] [DUMET 2010]
• Maximum alcohol concentration reached during fermentation by yeast is
• Biogas production from waste biomass with the help of methanogenic bacteria is [Pb. PMT 1999]
• The residue left after methane production from cattle dung is [NCERT]
• Given below are two statements: Statement I : Secondary effluent is released from Anaerobic sludge digester into…
• From the statements given below choose the correct statement(s): I. Rhizobium forms root nodules in leguminous plants…
• A sewage treatment process, in which a part of decomposer bacteria present in the wastes is recycled into the starting…
• Assertion : Sugar crops and starch crops are valuable as solar energy converters. Reason : They provide both liquid and…
• The technology of biogas production from cow dung was developed in India largely due to the efforts of [NCERT Pg. No…
• Match the items in Column ‘A’ and Column ‘B’ and choose correct answer Column A Column B A. Lady bird i. Methano…
• Which one is green manure/biofertilizer [Wardha 2002]
• Large holes in Swiss cheese are due to bacterium [NCERT Pg. No. 151]
• Streptococcus is employed in the manufacturing of [BVP 2004]

← All Biology NEET chapters · All subjects