Class XII · Biology practice
Microbes in Human Welfare MCQs
Check your understanding, bookmark questions and revisit your mistakes.
455 questions in this collection · Page 22 of 46
Question 211 of 455
📘 CLASS XII
Microbes In Human Welfare
The activated sludge, after sedimentation, is used as an inoculum by being pumped back into the:
A small part of the activated sludge is pumped back into the aeration tank to serve as the inoculum.
Question 212 of 455
📘 CLASS XII
Microbes In Human Welfare
The major component of biogas that can be used as fuel is:
Biogas is a mixture of gases (containing predominantly methane) produced by the microbial activity and which may be used as fuel.
Question 213 of 455
📘 CLASS XII
Microbes In Human Welfare
What is the purpose of the Ganga Action Plan and Yamuna Action Plan?
Under these plans, it is proposed to build a large number of sewage treatment plants so that only treated sewage may be discharged in the rivers.
Question 214 of 455
📘 CLASS XII
Microbes In Human Welfare
What is the term for organisms that enrich the nutrient quality of the soil?
Biofertilisers are organisms that enrich the nutrient quality of the soil.
Question 215 of 455
📘 CLASS XII
Microbes In Human Welfare
Which fungus is obtained to produce the immunosuppressive drug Cyclosporin A?
Cyclosporin A... is produced by the fungus Trichoderma polysporum.
Question 216 of 455
📘 CLASS XII
Microbes In Human Welfare
Which yeast is obtained to produce Statins (blood cholesterol lowering agents)?
Statins produced by the yeast Monascus purpureus.
Question 217 of 455
📘 CLASS XII
Microbes In Human Welfare
The bacterium *Streptococcus* is used in the production of which bioactive agent?
Streptokinase produced by the bacterium Streptococcus.
Question 218 of 455
📘 CLASS XII
Microbes In Human Welfare
What does the Greek word ‘bio’ in antibiotic mean?
Anti is a Greek word that means ‘against’, and bio means ‘life’.
Question 219 of 455
📘 CLASS XII
Microbes In Human Welfare
Which microbe produces the organic acid Butyric acid?
Clostridium butylicum (a bacterium) of butyric acid.
Question 220 of 455
📘 CLASS XII
Microbes In Human Welfare
In the sewage treatment process, the BOD is reduced significantly during which stage?
While growing, these microbes [flocs] consume the major part of the organic matter in the effluent. This significantly reduces the BOD....
Page score: 0/40