Answers and bookmarks are saved in this browser, across visits. They do not sync to your account.
455 questions in this collection · Page 15 of 46
Question 141 of 455
📘 CLASS XII
Microbes In Human Welfare
The major gas components of biogas are methane, carbon dioxide, and:
Bacteria produce a mixture of gases such as methane, hydrogen sulphide and carbon dioxide.
Question 142 of 455
📘 CLASS XII
Microbes In Human Welfare
Methanogens are bacteria that grow primarily under which condition?
Certain bacteria, which grow anaerobically on cellulosic material, produce large amount of methane.
Question 143 of 455
📘 CLASS XII
Microbes In Human Welfare
Biogas is used in rural areas primarily for:
The biogas thus produced is used for cooking and lighting.
Question 144 of 455
📘 CLASS XII
Microbes In Human Welfare
Which approach to pest control relies on natural predation rather than introduced chemicals?
In agriculture, there is a method of controlling pests that relies on natural predation rather than introduced chemicals.
Question 145 of 455
📘 CLASS XII
Microbes In Human Welfare
The Ladybird beetle is a natural predator used to control:
The Ladybird... [is] useful to get rid of aphids.
Question 146 of 455
📘 CLASS XII
Microbes In Human Welfare
The spores of Bacillus thuringiensis are effective against butterfly caterpillars because:
In the gut of the larvae, the toxin is released and the larvae get killed. (Note: Although the source does not state "alkaline," it confirms toxin release in the gut.)
Question 147 of 455
📘 CLASS XII
Microbes In Human Welfare
What characteristic makes Baculoviruses excellent candidates for species-specific insecticidal applications?
These viruses are excellent candidates for species-specific, narrow spectrum insecticidal applications.
Question 148 of 455
📘 CLASS XII
Microbes In Human Welfare
Cyanobacteria are classified as which type of organism based on their nutrient synthesis?
Cyanobacteria are autotrophic microbes widely distributed in aquatic and terrestrial environments.
Question 149 of 455
📘 CLASS XII
Microbes In Human Welfare
Which category of microbe plays a vital role in sewage treatment by consuming the major part of the organic matter in the effluent?
While growing, these microbes [aerobic flocs] consume the major part of the organic matter in the effluent.
Question 150 of 455
📘 CLASS XII
Microbes In Human Welfare
Which characteristic allows Lipases to be effective in detergents?
Lipases are helpful in removing oily stains from the laundry.