Class XII · Biology practice
Microbes in Human Welfare MCQs
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455 questions in this collection · Page 43 of 46
Question 421 of 455
📘 CLASS XII
Microbes In Human Welfare
The development of the technology of biogas production in India was a joint effort between IARI and ____.
The technology of biogas production was developed in India mainly due to the efforts of IARI and KVIC.
Question 422 of 455
📘 CLASS XII
Microbes In Human Welfare
Microbes used as biocontrol agents are a method of controlling plant diseases and pests using ____ methods.
Biocontrol refers to the use of biological methods for controlling plant diseases and pests.
Question 423 of 455
📘 CLASS XII
Microbes In Human Welfare
The use of Bt spores sprayed on plants is an effective biocontrol agent against ____.
The bacteria *Bacillus thuringiensis* (Bt) is used to control butterfly caterpillars.
Question 424 of 455
📘 CLASS XII
Microbes In Human Welfare
The fungus *Trichoderma* is a free-living fungus effective as a biocontrol agent against several plant ____.
*Trichoderma* species... are effective biocontrol agents of several plant pathogens.
Question 425 of 455
📘 CLASS XII
Microbes In Human Welfare
The three main sources of biofertilisers mentioned are bacteria, fungi and ____.
The main sources of biofertilisers are bacteria, fungi and cyanobacteria.
Question 426 of 455
📘 CLASS XII
Microbes In Human Welfare
Biogas produced by microbes is used in rural areas for cooking and ____.
The biogas thus produced is used for cooking and lighting.
Question 427 of 455
📘 CLASS XII
Microbes In Human Welfare
Antibiotics have greatly improved our capacity to treat deadly diseases such as plague, diphtheria, whooping cough, and ____.
Antibiotics have greatly improved our capacity to treat deadly diseases such as plague, whooping cough, diphtheria and leprosy.
Question 428 of 455
📘 CLASS XII
Microbes In Human Welfare
The spherical shaped bacteria shown in Figure 8.1(b) are magnified ____ X.
Figure 8.1 (b) shows spherical shaped bacteria, magnified 1500X.
Question 429 of 455
📘 CLASS XII
Microbes In Human Welfare
The first step in primary sewage treatment involves the removal of floating debris by sequential ____.
Initially, floating debris is removed by sequential filtration.
Question 430 of 455
📘 CLASS XII
Microbes In Human Welfare
The reduction of BOD in the effluent is a result of the aerobic microbes consuming the major part of the ____.
While growing, these microbes consume the major part of the organic matter in the effluent.
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