CBSE Class 12 (Science) Microbes in Human Welfare — practice questions
92 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice CBSE Class 12 (Science) Microbes in Human Welfare in the app →Anabaena and Nostoc are examples of:Milk is converted into curd by which micro-organism?The puffed up appearance of dough is caused by:The yeast used in baking and brewing is:The first antibiotic to be discovered was:Municipal waste water is also called:The gas produced by microbes from dung and used as fuel is:Lactic acid bacteria coagulate milk protein by producing:Penicillin was named after which mould?Cyclosporin A is obtained from which organism?BOD stands for biochemical oxygen:Sewage is treated until its BOD is:Bacteria that produce methane in a biogas plant are called:A common methane producing bacterium is:Biogas made from cattle dung is commonly called:The fungus developed as a biological control for plant disease is:Baculoviruses are used as biological control agents against:Root nodules of legumes are formed by symbiosis with:Cyanobacteria such as Anabaena serve as biofertilisers in:Milk is turned into curd by bacteria called:Lactic acid bacteria set milk by producing:A small amount of curd added to fresh milk acts as a:Curd improves nutrition by increasing a vitamin of the group:The puffed up look of dosa and idli dough comes from:Bread dough is fermented using baker's:Toddy is a traditional drink made by fermenting sap from:Swiss cheese gets its large holes from which gas:Roquefort cheese is ripened by growing on it a specific:Penicillin was discovered by chance by:Penicillin takes its name from the mould:Penicillin's full potential was established by Howard Florey and:Penicillin was used extensively to treat soldiers wounded in:Fleming, Chain and Florey received the Nobel Prize in:Sewage treatment begins with a stage that removes particles by:Solids settling out in primary treatment form the primary:In secondary treatment the effluent goes into large tanks that are:Masses of bacteria with fungal filaments in aeration tanks are called:The sediment settling after secondary treatment is called activated:The remaining sludge is digested in tanks that are:Biogas produced from dung is commonly called:Bacteria producing biogas are known as:Which group of bacteria converts milk into curd?Which vitamin content of milk rises when it is converted to curd?Which gas makes the dough for idli and dosa puff up on fermentation?Which microbe is used to ferment dough for making bread?Roquefort cheese gets its particular flavour from ripening with what?What are the very large vessels used for industrial microbial growth called?Which yeast is used for fermenting malted cereals and fruit juices to make ethanol?Which pair of beverages is produced without distillation?Which of these drinks is obtained by distilling a fermented broth?What are antibiotics, in microbiological terms?Alexander Fleming noticed a mould inhibiting growth of which bacteria?Who established the full potential of penicillin as an effective antibiotic?In which year did Fleming, Chain and Florey share the Nobel Prize for penicillin?Which fungus is used for commercial production of citric acid?Which bacterium is used to produce acetic acid commercially?Butyric acid is produced industrially by which bacterium?Which acid is made commercially with the help of Lactobacillus?Commercial production of ethanol relies on which organism?Which bacterial product is used as a clot buster after a heart attack?Cyclosporin A, an immunosuppressant for organ transplants, comes from which fungus?Blood-cholesterol lowering statins are produced by which yeast?How do statins lower blood cholesterol?Sewage treatment is done by which kind of microbes?In primary sewage treatment, what is the settled solid material called?What does the supernatant of the primary settling tank form?The primary effluent is passed to which units for biological treatment?In aeration tanks, which microbes grow vigorously into flocs?What does the abbreviation BOD stand for?A sample of waste water has a high BOD. What does this indicate?What is the sediment of bacterial flocs in the settling tank called?Why is a small part of activated sludge pumped back to the aeration tank?Where is the remaining activated sludge digested by anaerobic bacteria?Which action plan was started to save a major river of India from pollution?Biogas is a mixture of gases that predominantly contains which gas?Anaerobic bacteria that grow on cellulosic material and produce methane are collectively called what?Which is a common methanogenic bacterium?In cattle, methanogens help in digestion in which part of the stomach?A biogas plant consists of a concrete tank about how deep?What is fed into the tank of a biogas plant?Which two organisations mainly developed biogas technology in India?What does biocontrol mean?Which bacterium is used as a microbial biocontrol agent against butterfly caterpillars?Where does the Bt toxin get released to kill the insect larva?Which crop carries Bt toxin genes introduced by genetic engineering?Which free-living root-ecosystem fungus is a biocontrol agent of plant pathogens?Most baculoviruses used as biocontrol agents belong to which genus?What are biofertilisers?Which two bacteria fix atmospheric nitrogen while free-living in soil?Many members of which genus form mycorrhiza with plants?What does the fungal partner in mycorrhiza absorb from soil for the plant?Which microbes serve as an important biofertiliser in paddy fields?