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Microbes in Human Welfare MCQs
Class XII Biology
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NCERT Based
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NEET Practice
📘 Concept Based
📝 Exam Level
🤖 AI Explanations
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455 questions in this chapter
Question 41 of 455
📘 CLASS XII
Dragonflies are biocontrol agents useful for getting rid of:
Dragonflies are useful to get rid of mosquitoes.
Question 42 of 455
📘 CLASS XII
The bacteria *Bacillus thuringiensis* (Bt) is introduced to control which specific pest?
Bacillus thuringiensis (Bt) is a microbial biocontrol agent used to control butterfly caterpillars.
Question 43 of 455
📘 CLASS XII
When insect larvae eat the spores of *Bacillus thuringiensis*, 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 44 of 455
📘 CLASS XII
Which fungus is being developed as a biological control agent for the treatment of various plant diseases, common in root ecosystems?
A biological control being developed for use in the treatment of plant disease is the fungus Trichoderma.
Question 45 of 455
📘 CLASS XII
Which group of pathogens primarily attack insects and other arthropods, and are often used as biological control agents?
Baculoviruses are pathogens that attack insects and other arthropods.
Question 46 of 455
📘 CLASS XII
The majority of baculoviruses used as biological control agents belong to which genus?
The majority of baculoviruses used as biological control agents are in the genus Nucleopolyhedrovirus.
Question 47 of 455
📘 CLASS XII
Baculoviruses are desirable for Integrated Pest Management (IPM) because they have no negative impacts on:
They have been shown to have no negative impacts on plants, mammals, birds, fish or even on non-target insects.
Question 48 of 455
📘 CLASS XII
Biofertilisers are defined as organisms that:
Biofertilisers are organisms that enrich the nutrient quality of the soil.
Question 49 of 455
📘 CLASS XII
The main sources of biofertilisers listed in the text are:
The main sources of biofertilisers are bacteria, fungi and cyanobacteria.
Question 50 of 455
📘 CLASS XII
*Rhizobium* forms symbiotic associations on the roots of leguminous plants primarily to fix:
These bacteria fix atmospheric nitrogen into organic forms, which is used by the plant as nutrient.
