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455 questions in this collection · Page 21 of 46
Question 201 of 455
📘 CLASS XII
Microbes In Human Welfare
Biogas can be described as a mixture of gases produced by:
Biogas is a mixture of gases... produced by the microbial activity and which may be used as fuel.
Question 202 of 455
📘 CLASS XII
Microbes In Human Welfare
Which of the following is NOT a type of microbe mentioned in the introductory text?
Microbes are diverse—protozoa, bacteria, fungi and microscopic animal and plant viruses, viroids and also prions. (Algae is often used synonymously with Cyanobacteria later, but "Algae" is not listed in the initial diversity section.)
Question 203 of 455
📘 CLASS XII
Microbes In Human Welfare
Microbes are used to ferment fish, soyabean, and which plant shoots to make traditional foods?
Microbes are also used to ferment fish, soyabean and bamboo-shoots to make foods.
Question 204 of 455
📘 CLASS XII
Microbes In Human Welfare
Which stage of sewage treatment relies entirely on physical removal processes?
Primary treatment steps basically involve physical removal of particles—large and small—from the sewage through filtration and sedimentation.
Question 205 of 455
📘 CLASS XII
Microbes In Human Welfare
The BOD value of untreated sewage (Sample C) was recorded as 400 mg/L. This indicates:
The greater the BOD of waste water, more is its polluting potential.
Question 206 of 455
📘 CLASS XII
Microbes In Human Welfare
Which organization, alongside IARI, helped develop the technology of biogas production in India?
The technology of biogas production was developed in India mainly due to the efforts of Indian Agricultural Research Institute (IARI) and Khadi and Village Industries Commission (KVIC).
Question 207 of 455
📘 CLASS XII
Microbes In Human Welfare
The primary source of food/energy for methanogens in cattle rumen is:
A lot of cellulosic material present in the food of cattle is also present in the rumen.
Question 208 of 455
📘 CLASS XII
Microbes In Human Welfare
Which type of infectious agent is magnified about 1,00,000–1,50,000X in the figures provided in the text?
Figure 8.2 shows Viruses, Magnified about 1,00,000–1,50,000X.
Question 209 of 455
📘 CLASS XII
Microbes In Human Welfare
The fungus used for ripening Roquefort cheese gives it a specific:
The ‘Roquefort cheese’ are ripened by growing a specific fungi on them, which gives them a particular flavour.
Question 210 of 455
📘 CLASS XII
Microbes In Human Welfare
Which organic acid is derived from the bacterium *Lactobacillus* on an industrial scale?