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Microbes in Human Welfare MCQs

Class XII Biology β€’ NCERT Based β€’ NEET Practice

πŸ“˜ Concept Based πŸ“ Exam Level πŸ€– AI Explanations
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455 questions in this chapter
Question 351 of 455
πŸ“˜ CLASS XII
The genus Trichoderma species are free-living fungi very common in the _____ ecosystems.
*Trichoderma* species are free-living fungi that are very common in the root ecosystems.
Question 352 of 455
πŸ“˜ CLASS XII
Fungi and bacteria are utilized in the industrial production of organic acids, alcohols, and _____.
Microbes are also used for commercial and industrial production of certain chemicals like organic acids, alcohols and enzymes.
Question 353 of 455
πŸ“˜ CLASS XII
The spherical shaped bacterium shown in Figure 8.1(b) is magnified _____.
Figure 8.1 (b) shows spherical shaped bacteria, magnified 1500X.
Question 354 of 455
πŸ“˜ CLASS XII
The term "brewer’s yeast" is specifically associated with the industrial production of _____.
The brewer’s yeast is used for fermenting malted cereals and fruit juices, to produce ethanol.
Question 355 of 455
πŸ“˜ CLASS XII
The production of wines and beers differs from that of whisky and brandy because the former does not involve _____.
Wine and beer are produced without distillation whereas whisky, brandy and rum are produced by distillation.
Question 356 of 455
πŸ“˜ CLASS XII
The major component of waste water that contributes to its high organic content is _____.
A major component of this waste water is human excreta.
Question 357 of 455
πŸ“˜ CLASS XII
The microbial growth in the aeration tank during secondary treatment is facilitated by constantly pumping in _____.
The primary effluent is passed into large aeration tanks where it is constantly agitated mechanically and air is pumped into it.
Question 358 of 455
πŸ“˜ CLASS XII
The two major components of biofertilisers that are bacteria are Rhizobium and free-living bacteria like _____.
Examples of free-living nitrogen-fixing bacteria are Azospirillum and Azotobacter.
Question 359 of 455
πŸ“˜ CLASS XII
The use of Baculoviruses is considered desirable for IPM because they are species-specific and narrow _____ insecticidal applications.
These viruses are excellent candidates for species-specific, narrow spectrum insecticidal applications.
Question 360 of 455
πŸ“˜ CLASS XII
Microbes are major components of biological systems, found deep in the soil, under layers of snow, and inside our bodies, indicating their great _____.
Microbes are diverseβ€”protozoa, bacteria, fungi and microscopic animal and plant viruses....