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Microbes in Human Welfare MCQs
Class XII Biology
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NCERT Based
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NEET Practice
📘 Concept Based
📝 Exam Level
🤖 AI Explanations
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455 questions in this chapter
Question 171 of 455
📘 CLASS XII
In the biogas plant, what is fed into the concrete tank along with bio-wastes?
A concrete tank... in which bio-wastes are collected and a slurry of dung is fed.
Question 172 of 455
📘 CLASS XII
Which principle dictates that the more variety a landscape has, the more sustainable it is, according to organic farmers?
A key belief of the organic farmer is that biodiversity furthers health. The more variety a landscape has, the more sustainable it is.
Question 173 of 455
📘 CLASS XII
The introduction of B. thuringiensis toxin genes into plants results in plants that are resistant to attack by:
Such plants are resistant to attack by insect pests.
Question 174 of 455
📘 CLASS XII
Which method helps avoid the heavy use of toxic pesticides for controlling pests?
The biocontrol measures help us to avoid heavy use of toxic pesticides for controlling pests.
Question 175 of 455
📘 CLASS XII
Which of the following cyanobacteria is specifically mentioned as a biofertiliser?
e.g. Anabaena, Nostoc, Oscillatoria, etc..
Question 176 of 455
📘 CLASS XII
What is the primary role of LAB in the production of curd from milk?
During growth, the LAB produce acids that coagulate and partially digest the milk proteins.
Question 177 of 455
📘 CLASS XII
Which organism is known as baker’s yeast and brewer’s yeast?
The same yeast Saccharomyces cerevisiae is used for bread-making (baker’s yeast) and beverages (brewer’s yeast).
Question 178 of 455
📘 CLASS XII
What is the industrial source of Citric acid?
Aspergillus niger (a fungus) of citric acid.
Question 179 of 455
📘 CLASS XII
What is the primary distinction between wine/beer and whisky/brandy production?
Wine and beer are produced without distillation whereas whisky, brandy and rum are produced by distillation.
Question 180 of 455
📘 CLASS XII
Streptokinase is modified by which technique before being used as a clot buster?
Streptokinase produced by the bacterium Streptococcus and modified by genetic engineering is used as a ‘clot buster’.
