Class XII · Biology practice
Microbes in Human Welfare MCQs
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455 questions in this collection · Page 45 of 46
Question 441 of 455
📘 CLASS XII
Microbes In Human Welfare
The bacterial species *Propionibacterium sharmanii* is responsible for the large holes in ____ cheese.
The large holes in ‘‘Swiss cheese’’ are due to production of a large amount of CO2 by a bacterium named *Propionibacterium sharmanii*.
Question 442 of 455
📘 CLASS XII
Microbes In Human Welfare
The antibiotic Penicillin was derived from the mould ____.
He named it Penicillin after the mould *Penicillium notatum*.
Question 443 of 455
📘 CLASS XII
Microbes In Human Welfare
The production of alcohol (ethanol) on a commercial scale relies on the yeast ____.
Yeast (*Saccharomyces cerevisiae*) is used for commercial production of ethanol.
Question 444 of 455
📘 CLASS XII
Microbes In Human Welfare
Statins lower blood cholesterol by competitively ____ the enzyme responsible for cholesterol synthesis.
It acts by competitively inhibiting the enzyme responsible for synthesis of cholesterol.
Question 445 of 455
📘 CLASS XII
Microbes In Human Welfare
The primary sludge formed during sewage treatment consists of settled solids, while the liquid supernatant is the ____.
The supernatant forms the effluent.
Question 446 of 455
📘 CLASS XII
Microbes In Human Welfare
When the BOD of sewage is reduced significantly, the effluent is passed into a settling tank where flocs sediment to form ____.
The bacterial ‘‘flocs’’ are allowed to sediment in a settling tank where they form the activated sludge.
Question 447 of 455
📘 CLASS XII
Microbes In Human Welfare
The gases produced by anaerobic bacteria during sludge digestion are used as a source of energy because the biogas is ____.
These gases form biogas and can be used as source of energy as it is inflammable.
Question 448 of 455
📘 CLASS XII
Microbes In Human Welfare
Methanogens help in the breakdown of ____ material in the rumen of cattle.
A lot of cellulosic material present in the food of cattle is also present in the rumen.
Question 449 of 455
📘 CLASS XII
Microbes In Human Welfare
The philosophy of biocontrol relies on natural ____ rather than introduced chemicals for pest control.
A method of controlling pests that relies on natural predation rather than introduced chemicals.
Question 450 of 455
📘 CLASS XII
Microbes In Human Welfare
The use of Baculoviruses in IPM is desirable because they are species-specific and have narrow ____ insecticidal applications.
Baculoviruses are pathogens... These viruses are excellent candidates for species-specific, narrow spectrum insecticidal applications.
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