Class XII · Biology practice
Microbes in Human Welfare MCQs
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455 questions in this collection · Page 41 of 46
Question 401 of 455
📘 CLASS XII
Microbes In Human Welfare
Mycorrhizal association provides plants with resistance to ____ pathogens.
Plants having such associations show benefits such as resistance to root-borne pathogens.
Question 402 of 455
📘 CLASS XII
Microbes In Human Welfare
Microbes degrade plant waste to produce methane, which is commonly used as a source of ____ in rural areas.
Biogas produced by microbes is used as a source of energy in rural areas.
Question 403 of 455
📘 CLASS XII
Microbes In Human Welfare
The red and black marked beetle used for biocontrol is the ____.
The very familiar beetle with red and black markings – the Ladybird, is useful to get rid of aphids.
Question 404 of 455
📘 CLASS XII
Microbes In Human Welfare
The overall goal of the Ganga Action Plan and Yamuna Action Plan is to build enough STPs to ensure only ____ sewage is discharged into the rivers.
Under these plans, it is proposed to build a large number of sewage treatment plants so that only treated sewage may be discharged in the rivers.
Question 405 of 455
📘 CLASS XII
Microbes In Human Welfare
The type of gas produced by microbes depends on the microbes and the organic ____ they utilise.
The type of the gas produced depends upon the microbes and the organic substrates they utilise.
Question 406 of 455
📘 CLASS XII
Microbes In Human Welfare
Biogas plants are more often built in rural areas because cattle ____ is available in large quantities.
Cattle dung is available in large quantities in rural areas.
Question 407 of 455
📘 CLASS XII
Microbes In Human Welfare
The conventional farming practices often use chemical methods to kill both useful and harmful life forms ____.
Conventional farming practices... often use chemical methods to kill both useful and harmful life forms indiscriminately.
Question 408 of 455
📘 CLASS XII
Microbes In Human Welfare
Bt-cotton plants are resistant to attack by ____.
Such plants are resistant to attack by insect pests.
Question 409 of 455
📘 CLASS XII
Microbes In Human Welfare
The use of chemical fertilisers leads to pollution and pressure to switch to ____ farming.
There is a large pressure to switch to organic farming.
Question 410 of 455
📘 CLASS XII
Microbes In Human Welfare
The bacteria *Rhizobium* are symbiotic, while *Azospirillum* and *Azotobacter* are ____ nitrogen fixers.
Other bacteria can fix atmospheric nitrogen while free-living in the soil (examples Azospirillum and Azotobacter).
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