NEET PYQ ; Microbes in Human Welfare Test- 1
Ncert 12 Biology chapter Microbes in Human welfare is important for the Neet examination
every year almost 1-2 question are being asked on this chapter we will cover all NEET Pyq on Microbes in Human Welfare
In this chapter we will study the following
Microbes in Human Welfare – Household Product
Microbes in Human Welfare – Industrial Product
Microbes in Human Welfare – Sewage Treatment
Microbes in Human Welfare – Production of Biogas
Microbes in Human Welfare – Biocontrol Agents
Microbes in Human Welfare – Biofertilizer
1) Which of the following microorganism is used for production Citric acid in industry
( 1998)
a) Aspergillus niger
b) Rhizopus nigricans
c) Lactobacillus bulgaris
d) Penicillium citrinum
Solution –
Aspergillus niger is used in the production citric acid
https://en.wikipedia.org/wiki/Citric_acid
2) Which of the following is a commercial blood cholesterol lowering agent ? ( 2019)
a) lipase
b) Cyclosporin A
c) Statin
d) Streptokinanse
Solution – Cholesterol is also known as Bad Cholesterol as it is very harmful to humans ” Statin ” is a commercial blood cholesterol lowering agent because it reduces the production of the cholesterol
3) A nitrogen- fixing microbes associated with Azolla in rice fields is ( 2012 )
a) Spirulina
b) Anabaena
c) Frankia
d) Tolypothrix
Solution – Anabaena is a nitrogen fixing micro organism associated with the Azolla in rice field
Frankia is nitrogen fixing bacteria which is associated with the ” Actinorhizal Plant ”
https://biosimplified.com/neet-topic-wise-questions-animal-classification-1/
4) A prokaryotic autotrophic nitrogen fixing symbiont is found in ( 2011)
a) Alnus
b) Cycas
c) Cicer
d) Pisum
Solution – A prokaryotic autotrophic nitrogen fixing Symbiont is found in Cycas
Cycas posses a small special roots known as “Coralloid roots”
“Coralloid roots” contain Symbiotic Cyanobacteria which fix the Nitrogen
5) Which of the following is not biofertilizer ? ( 2011)
a) Agrobacterium
b) Rhizobium
c) Nostoc
d) Mycorrhiza
Solution – Agrobacterium is not biofertilizer rest all are all other are biofertilizer
https://en.wikipedia.org/wiki/Agrobacterium
6) Which aquatic fern is used to increase yield in paddy crop ? (2000)
a) Azolla
b) Salvinia
c) Marsilea
d) Isoetes
Solution – Azolla is a aquatic fern which is used to increase yield in Paddy crop
7) Due to which of the following organism yield of rice is increased ? ( 1999)
a) Sesbania
b) Bacillus popilliae
c) Anabaena
d) Bacillus subtillis
Solution – Due to Anabaena organism yield of the rice is increased
8) The Rotenone is ( 1995 )
a) a natural herbicide
b) a natural insecticide
c) an insect hormone
d) a bioherbicide
Solution – The Rotenone is a Natural insecticide
9) In gobar gas, the maximum amount is that of
a) Butane
b) Methane
c) Propane
d) Carbon dioxide
Solution – In gobar gas the maximum amount is that of the Methane
Gobar gas also known as Biogas is a Renewable gaseous energy source
it is produced form following Raw material
1) Animal waste
2) Manure
3) Agriculture Waste
4) Plant material
5) Sewage
6) Green waste
It is produced by anaerobic respiration
11) Organisms called Methanogens are most Abundant in a ( 2012)
a) Sulphur rock
b) Cattle yard
c) Polluted streams
d) Hot Spring
Solution – Methanogens are most abundant in a Cattle Yard
12) During anaerobic digestion of organic waste, such as in producing biogas, which one of the following is left undegraded ( 2003 )
a) lipid
b) Lignin
c) Hemi- Cellulose
d) Cellulose
Solution – Lignin is left undegraded during anaerobic digestion of organic waste.
13) A major component of gobar gas is ( 2007)
a) Ammonia
b) Methane
c) Ethane
d) Butane
Solution – Methane is the major component of the biogas
14) Which bacteria is used in Gobar gas plant ( 2002)
a) Methanogens
b) Nitrifying bacteria
c) Ammonifying bacteria
d) Denitrifying bacteria
Solution – Methanogens is used in the gobar gas plant
15) A Common biocontrol agent for the control of plant disease is ( 2010)
a) baculovirus
b) Bacillus thuringiensis
c) Glomus
d) Trichoderma
Solution – Trichoderma is a common biocontrol agent for the control of plant disease