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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 291 of 455
📘 CLASS XII
The main sources of biofertilisers are bacteria, fungi, and _____.
The main sources of biofertilisers are bacteria, fungi and cyanobacteria.
Question 292 of 455
📘 CLASS XII
_____ bacteria form symbiotic associations (nodules) on the roots of leguminous plants to fix atmospheric nitrogen.
The nodules on the roots of leguminous plants are formed by the symbiotic association of Rhizobium.
Question 293 of 455
📘 CLASS XII
Examples of free-living bacteria that fix atmospheric nitrogen in the soil are Azospirillum and _____.
Other bacteria can fix atmospheric nitrogen while free-living in the soil (examples Azospirillum and Azotobacter).
Question 294 of 455
📘 CLASS XII
The symbiotic association formed between fungi and plants is known as _____.
Fungi are also known to form symbiotic associations with plants (mycorrhiza).
Question 295 of 455
📘 CLASS XII
Many members of the genus _____ form mycorrhiza.
Many members of the genus Glomus form mycorrhiza.
Question 296 of 455
📘 CLASS XII
The fungal symbiont in mycorrhizal associations absorbs _____ from the soil and passes it to the plant.
The fungal symbiont... absorbs phosphorus from soil and passes it to the plant.
Question 297 of 455
📘 CLASS XII
Plants with mycorrhizal associations show increased tolerance to salinity and _____.
Plants having such associations show tolerance to salinity and drought.
Question 298 of 455
📘 CLASS XII
Cyanobacteria are autotrophic microbes, many of which can fix _____.
Cyanobacteria... many of which can fix atmospheric nitrogen.
Question 299 of 455
📘 CLASS XII
Examples of nitrogen-fixing cyanobacteria used as biofertilisers include Anabaena, Nostoc, and _____.
e.g. Anabaena, Nostoc, Oscillatoria, etc..
Question 300 of 455
📘 CLASS XII
Blue green algae (Cyanobacteria) increase soil fertility by fixing N2 and adding _____.
Blue green algae also add organic matter to the soil and increase its fertility.
