Class XII · Biology practice
Microbes in Human Welfare MCQs
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455 questions in this collection · Page 38 of 46
Question 371 of 455
📘 CLASS XII
Microbes In Human Welfare
Blue green algae (Cyanobacteria) serve as an important biofertiliser in paddy fields, also adding _____ matter to the soil.
Blue green algae also add organic matter to the soil and increase its fertility.
Question 372 of 455
📘 CLASS XII
Microbes In Human Welfare
The total magnification range shown for the viruses in Figure 8.2 is about 1,00,000– _____X.
Figure 8.2 shows Viruses: Magnified about 1,00,000–1,50,000X.
Question 373 of 455
📘 CLASS XII
Microbes In Human Welfare
The conversion of milk to curd is a common example of using microbes or products derived from them _____.
A common example is the production of curd from milk. We use microbes or products derived from them everyday.
Question 374 of 455
📘 CLASS XII
Microbes In Human Welfare
The gas produced during fermentation of dough causes a _____ appearance.
The puffed-up appearance of dough is due to the production of CO2 gas.
Question 375 of 455
📘 CLASS XII
Microbes In Human Welfare
The specific microbes used determine the characteristic texture, flavour, and _____ of different varieties of cheese.
Different varieties of cheese are known by their characteristic texture, flavour and taste, the specificity coming from the microbes used.
Question 376 of 455
📘 CLASS XII
Microbes In Human Welfare
Fermentors are used to grow microbes in very large vessels for production on an _____ scale.
Production on an industrial scale, requires growing microbes in very large vessels called fermentors.
Question 377 of 455
📘 CLASS XII
Microbes In Human Welfare
Antibiotics are chemical substances produced by some microbes that can _____ or retard the growth of disease-causing microbes.
Antibiotics are chemical substances, which are produced by some microbes and can kill or retard the growth of other (disease-causing) microbes.
Question 378 of 455
📘 CLASS XII
Microbes In Human Welfare
The full potential of Penicillin as an effective antibiotic was established much later by Ernest Chain and _____.
Its full potential as an effective antibiotic was established much later by Ernest Chain and Howard Florey.
Question 379 of 455
📘 CLASS XII
Microbes In Human Welfare
The bacterium Streptococcus produces _____ which is used as a clot buster.
Streptokinase produced by the bacterium Streptococcus is used as a ‘clot buster’.
Question 380 of 455
📘 CLASS XII
Microbes In Human Welfare
Sewage is treated to make it less polluting before disposal into natural water bodies like rivers and _____.
The effluent from the secondary treatment plant is generally released into natural water bodies like rivers and streams.
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