Class XII · Biology practice
Microbes in Human Welfare MCQs
Check your understanding, bookmark questions and revisit your mistakes.
455 questions in this collection · Page 44 of 46
Question 431 of 455
📘 CLASS XII
Microbes In Human Welfare
The sediment formed by the bacterial flocs in the secondary settling tank is called ____.
The bacterial ‘‘flocs’’ are allowed to sediment... forming the activated sludge.
Question 432 of 455
📘 CLASS XII
Microbes In Human Welfare
The major reason why sewage needs treatment before discharge is the presence of large amounts of organic matter and ____.
Sewage contains large amounts of organic matter and microbes. Many of which are pathogenic.
Question 433 of 455
📘 CLASS XII
Microbes In Human Welfare
The organic farmer advocates for ____ to ensure a complex system of checks and balances in the ecosystem.
A key belief of the organic farmer is that biodiversity furthers health.
Question 434 of 455
📘 CLASS XII
Microbes In Human Welfare
The toxin released by *Bacillus thuringiensis* kills insect larvae after they ingest the spores and the toxin is released in the ____.
In the gut of the larvae, the toxin is released and the larvae get killed.
Question 435 of 455
📘 CLASS XII
Microbes In Human Welfare
The free-living fungus *Trichoderma* is very common in ____ ecosystems and used for biocontrol.
*Trichoderma* species are free-living fungi that are very common in the root ecosystems.
Question 436 of 455
📘 CLASS XII
Microbes In Human Welfare
Cyanobacteria are autotrophic microbes that are widely distributed in aquatic and terrestrial ____.
Cyanobacteria are autotrophic microbes widely distributed in aquatic and terrestrial environments.
Question 437 of 455
📘 CLASS XII
Microbes In Human Welfare
The use of biofertilisers helps farmers to replenish soil nutrients and to reduce dependence on ____ fertilisers.
Farmers use biofertilisers... to reduce dependence on chemical fertilisers.
Question 438 of 455
📘 CLASS XII
Microbes In Human Welfare
The bacterium that produces Acetic acid commercially is ____.
*Acetobacter aceti* (a bacterium) of acetic acid.
Question 439 of 455
📘 CLASS XII
Microbes In Human Welfare
The virus shown in Figure 8.2(c) is the rod-shaped ____ Virus (TMV).
Figure 8.2 (c) shows Rod-shaped Tobacco Mosaic Virus (TMV).
Question 440 of 455
📘 CLASS XII
Microbes In Human Welfare
Microbes are used to make traditional drinks, including 'Toddy', which is made by fermenting sap from ____.
‘Toddy’, a traditional drink... is made by fermenting sap from palms.
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