Class XII · Biology practice
Microbes in Human Welfare MCQs
Check your understanding, bookmark questions and revisit your mistakes.
455 questions in this collection · Page 35 of 46
Question 341 of 455
📘 CLASS XII
Microbes In Human Welfare
The use of chemical fertilisers has contributed significantly to environmental _____.
The use of the chemical fertilisers... has contributed significantly to this pollution.
Question 342 of 455
📘 CLASS XII
Microbes In Human Welfare
The bacterial disease caused by B. thuringiensis kills the caterpillars but leaves _____ unharmed.
The bacterial disease will kill the caterpillars, but leave other insects unharmed.
Question 343 of 455
📘 CLASS XII
Microbes In Human Welfare
The genus of fungus known to form mycorrhiza is _____.
Many members of the genus Glomus form mycorrhiza.
Question 344 of 455
📘 CLASS XII
Microbes In Human Welfare
The process of activated sludge formation in sewage treatment has been practiced for more than a _____ now.
This methodology [activated sludge formation] has been practiced for more than a century now.
Question 345 of 455
📘 CLASS XII
Microbes In Human Welfare
The rod-shaped microbe shown in Figure 8.1(a) is a _____.
Figure 8.1 (a) shows Rod-shaped Bacteria.
Question 346 of 455
📘 CLASS XII
Microbes In Human Welfare
The virus that causes respiratory infections, shown in Figure 8.2(b), is the _____.
Figure 8.2 (b) shows Adenovirus which causes respiratory infections.
Question 347 of 455
📘 CLASS XII
Microbes In Human Welfare
The two treatments for sewage treatment are Primary treatment and Secondary treatment, also known as _____ treatment.
Secondary treatment or Biological treatment.
Question 348 of 455
📘 CLASS XII
Microbes In Human Welfare
The biogas plant has a floating cover that keeps on rising as the _____ is produced due to microbial activity.
A floating cover is placed over the slurry, which keeps on rising as the gas is produced in the tank.
Question 349 of 455
📘 CLASS XII
Microbes In Human Welfare
The main gas produced during the microbial digestion of plant waste by methanogens is _____.
Methanogens produce methane (biogas) while degrading plant waste.
Question 350 of 455
📘 CLASS XII
Microbes In Human Welfare
Bacteria fix atmospheric nitrogen into _____ forms, which are then used by the plant as nutrient.
These bacteria fix atmospheric nitrogen into organic forms, which is used by the plant as nutrient.
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