Class XII · Biology practice
Microbes in Human Welfare MCQs
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455 questions in this collection · Page 29 of 46
Question 281 of 455
📘 CLASS XII
Microbes In Human Welfare
The Ladybird beetle, recognizable by its red and black markings, is useful to get rid of _____.
The Ladybird, is useful to get rid of aphids.
Question 282 of 455
📘 CLASS XII
Microbes In Human Welfare
_____ are useful biocontrol agents to get rid of mosquitoes.
Dragonflies are useful to get rid of mosquitoes.
Question 283 of 455
📘 CLASS XII
Microbes In Human Welfare
The bacteria Bacillus thuringiensis (Bt) is used as a microbial biocontrol agent to control _____.
The bacteria *Bacillus thuringiensis* (Bt) can be introduced in order to control butterfly caterpillars.
Question 284 of 455
📘 CLASS XII
Microbes In Human Welfare
When insect larvae eat Bt spores, the toxin is released and kills the larvae in their _____.
In the gut of the larvae, the toxin is released and the larvae get killed.
Question 285 of 455
📘 CLASS XII
Microbes In Human Welfare
Scientists introduced B. thuringiensis toxin genes into plants using methods of _____ to create pest-resistant crops like Bt-cotton.
Because of the development of methods of genetic engineering... the scientists have introduced B. thuringiensis toxin genes into plants.
Question 286 of 455
📘 CLASS XII
Microbes In Human Welfare
A biological control agent being developed for plant disease treatment, common in root ecosystems, is the fungus _____.
A biological control being developed for use in the treatment of plant disease is the fungus Trichoderma.
Question 287 of 455
📘 CLASS XII
Microbes In Human Welfare
_____ are pathogens that attack insects and other arthropods and are used as biological control agents.
Baculoviruses are pathogens that attack insects and other arthropods.
Question 288 of 455
📘 CLASS XII
Microbes In Human Welfare
The majority of baculoviruses used as biological control agents belong to the genus _____.
The majority of baculoviruses used as biological control agents are in the genus Nucleopolyhedrovirus.
Question 289 of 455
📘 CLASS XII
Microbes In Human Welfare
Baculoviruses are desirable for IPM because they have no negative impacts on non-target insects, plants, mammals, birds, fish or even on _____.
They have been shown to have no negative impacts on plants, mammals, birds, fish or even on non-target insects.
Question 290 of 455
📘 CLASS XII
Microbes In Human Welfare
_____ are organisms that enrich the nutrient quality of the soil, often replacing chemical fertilisers.
Biofertilisers are organisms that enrich the nutrient quality of the soil.
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