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455 questions in this collection · Page 34 of 46
Question 331 of 455
📘 CLASS XII
Microbes In Human Welfare
Biochemical Oxygen Demand (BOD) refers to the amount of oxygen that would be consumed if all the _____ in one liter of water were oxidised by bacteria.
BOD refers to the amount of the oxygen that would be consumed if all the organic matter in one liter of water were oxidised by bacteria.
Question 332 of 455
📘 CLASS XII
Microbes In Human Welfare
Untreated sewage is often discharged directly into rivers leading to pollution and an increase in _____ diseases.
The untreated sewage is often discharged directly into rivers leading to their pollution and increase in water-borne diseases.
Question 333 of 455
📘 CLASS XII
Microbes In Human Welfare
Methanogens produce methane along with CO2 and _____.
Methanogens produce large amount of methane along with CO2 and H2.
Question 334 of 455
📘 CLASS XII
Microbes In Human Welfare
Biogas is produced and utilized more often in ____ areas due to the large availability of cattle dung.
Cattle dung is available in large quantities in rural areas... So biogas plants are more often built in rural areas.
Question 335 of 455
📘 CLASS XII
Microbes In Human Welfare
The use of biocontrol measures will greatly reduce our dependence on toxic chemicals and _____.
The use of biocontrol measures will greatly reduce our dependence on toxic chemicals and pesticides.
Question 336 of 455
📘 CLASS XII
Microbes In Human Welfare
An important part of biological farming is becoming familiar with the life cycles and feeding patterns of pests and _____.
An important part of the biological farming approach is to become familiar with the various life forms that inhabit the field, predators as well as pests.
Question 337 of 455
📘 CLASS XII
Microbes In Human Welfare
Bt-cotton is an example of a pest-resistant crop created by introducing B. thuringiensis toxin genes using _____.
Bt-cotton is one such example, created by methods of genetic engineering.
Question 338 of 455
📘 CLASS XII
Microbes In Human Welfare
Cyanobacteria like Anabaena and Nostoc serve as important biofertilisers in _____ fields.
In paddy fields, cyanobacteria serve as an important biofertiliser.
Question 339 of 455
📘 CLASS XII
Microbes In Human Welfare
Microbes are used in the production of traditional Indian foods like idli and _____.
The dough, which is used for making foods such as dosa and idli is also fermented by bacteria.
Question 340 of 455
📘 CLASS XII
Microbes In Human Welfare
Penicillin was discovered by Alexander Fleming on an unwashed culture plate around a mould called Penicillium _____.
Penicillin was named after the mould Penicillium notatum.