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455 questions in this collection · Page 11 of 46
Question 101 of 455
📘 CLASS XII
Microbes In Human Welfare
The biological farming approach advocates familiarity with the life cycles and feeding patterns of pests and predators. What is this understanding intended to help develop?
This will help develop appropriate means of biocontrol.
Question 102 of 455
📘 CLASS XII
Microbes In Human Welfare
Which crop is given as a specific example of a plant that was made insect-pest resistant through the introduction of the *B. thuringiensis* toxin gene?
Bt-cotton is one such example.
Question 103 of 455
📘 CLASS XII
Microbes In Human Welfare
Bacillus thuringiensis toxins kill caterpillars but leave which organisms unharmed?
The bacterial disease will kill the caterpillars, but leave other insects unharmed. Baculoviruses (used in IPM) also have no negative impacts on non-target insects.
Question 104 of 455
📘 CLASS XII
Microbes In Human Welfare
The symbiotic association between Rhizobium and leguminous plants involves the fixation of atmospheric nitrogen into forms that are:
These bacteria fix atmospheric nitrogen into organic forms, which is used by the plant as nutrient.
Question 105 of 455
📘 CLASS XII
Microbes In Human Welfare
Which organisms are listed as fixing nitrogen and serving as important biofertilisers in paddy fields?
In paddy fields, cyanobacteria serve as an important biofertiliser.
Question 106 of 455
📘 CLASS XII
Microbes In Human Welfare
In the context of industrial production, the word ‘anti’ means ‘against’ whom?
Anti means ‘against’ life, specifically in the context of disease causing organisms.
Question 107 of 455
📘 CLASS XII
Microbes In Human Welfare
Which specific microbe is used for the production of Lactic acid on an industrial scale?
Lactobacillus (a bacterium) is listed as an acid producer for lactic acid.
Question 108 of 455
📘 CLASS XII
Microbes In Human Welfare
The process of sewage treatment utilizing activated sludge formation has been practiced for approximately how long?
This methodology has been practiced for more than a century now, in almost all parts of the world.
Question 109 of 455
📘 CLASS XII
Microbes In Human Welfare
In the traditional Indian food preparation, which items are made from dough fermented by microbes?
The dough, which is used for making foods such as dosa and idli is also fermented by bacteria.
Question 110 of 455
📘 CLASS XII
Microbes In Human Welfare
What are chemical substances produced by some microbes that can kill or retard the growth of other (disease-causing) microbes called?
Antibiotics are chemical substances, which are produced by some microbes and can kill or retard the growth of other (disease-causing) microbes.