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Which one of the following is not used in organic farming?[2010]- a)Glomus
- b)Earthworm
- c)Oscillatoria
- d)Snail
Correct answer is option 'D'. Can you explain this answer?
Which one of the following is not used in organic farming?
[2010]
a)
Glomus
b)
Earthworm
c)
Oscillatoria
d)
Snail
|
Tejas Chavan answered |
Organic farming involves use of organic wastes and other biological material along with beneficial microbes to release nutrients to crop to increase the soil fertility in an ecofriendly, and pollution tree environment. Glomus, earthworm and Oscillatoria can be used in organic farming while snail cannot.
An organism used as a biofertilizer for raising soyabean crops is[2011]- a)Azotobacter
- b)Azospirillum
- c)Rhizobium
- d)Nostoc
Correct answer is option 'C'. Can you explain this answer?
An organism used as a biofertilizer for raising soyabean crops is
[2011]
a)
Azotobacter
b)
Azospirillum
c)
Rhizobium
d)
Nostoc
|
Maheshwar Saini answered |
Rhizobium is a nitrogen fixing bacteria, which acts as a biofertilizer in soil to produce soyabean crops.
The common nitrogen fixer in paddy fields is[2010]- a)Rhizobium
- b)Azospirillum
- c)Oscillatoria
- d)Frankia
Correct answer is option 'B'. Can you explain this answer?
The common nitrogen fixer in paddy fields is
[2010]
a)
Rhizobium
b)
Azospirillum
c)
Oscillatoria
d)
Frankia
|
Krish Chakraborty answered |
The common nitrogen fixer in paddy field is Azospirillum. It is an anaerobic bacteria that forms loose association with roots of paddy crops.
Maximum nutritional diversity is found in the group.[2012]- a)Fungi
- b)Animalia
- c)Monera
- d)Plantae
Correct answer is option 'C'. Can you explain this answer?
Maximum nutritional diversity is found in the group.
[2012]
a)
Fungi
b)
Animalia
c)
Monera
d)
Plantae
|
Lalit Yadav answered |
Maximum nutritional diversity is shown by the members of kingdom - Monera. Some of them are autotrophic (e.g. photosynthetic autotrophic or chemosynthetic autotrophic) while the vast majority are heterotrophs (e.g., saprotrophic or parasitic). Ecologically, these may be producers or decomposers.
Which of the following is pair of biofertilizers?[2001]- a)Azolla and BGA
- b)Nostoc and legumes
- c)Rhizobium and grasses
- d)Salmonella and E. coli
Correct answer is option 'A'. Can you explain this answer?
Which of the following is pair of biofertilizers?
[2001]
a)
Azolla and BGA
b)
Nostoc and legumes
c)
Rhizobium and grasses
d)
Salmonella and E. coli
|
Kunal Rane answered |
Azolla and blue green algae- Anabaena form biofertilizer in rice fields.
Which one of the following is an example of carrying out biological control of pests/ diseases using microbes ?
[2012]
- a)Bt - cotton to increase cotton yield
- b)Nucleopolyhedrovirus against white rust in Brassica
- c)Trichoderma sp. against certain plant pathogens
- d)All of above
Correct answer is option 'D'. Can you explain this answer?
Which one of the following is an example of carrying out biological control of pests/ diseases using microbes ?
[2012]
a)
Bt - cotton to increase cotton yield
b)
Nucleopolyhedrovirus against white rust in Brassica
c)
Trichoderma sp. against certain plant pathogens
d)
All of above
|
Prisha Khanna answered |
Biological control of pests/ diseases using microbes involves the use of microorganisms to control and manage pests and diseases in plants.
Bt - cotton to increase cotton yield:
Bt (Bacillus thuringiensis) is a soil bacterium that produces a protein that is toxic to many pest insects. Bt cotton is a genetically modified cotton that produces this protein, which reduces the need for chemical insecticides and increases cotton yield.
Nucleopolyhedrovirus against white rust in Brassica:
Nucleopolyhedrovirus is a virus that infects and kills certain insect pests, including the larvae of the diamondback moth, which is a major pest of Brassica crops. The use of this virus as a biological control agent can help reduce the need for chemical insecticides and improve crop yield.
Trichoderma sp. against certain plant pathogens:
Trichoderma is a genus of fungi that can be used as a biological control agent against certain plant pathogens, including Fusarium, Rhizoctonia, and Pythium species. Trichoderma sp. can colonize plant roots and produce enzymes that help control these pathogens, reducing the need for chemical fungicides and improving plant health.
All of above:
All of the above examples involve the use of microbes as a biological control agent to manage pests and diseases in plants. These methods are environmentally friendly and sustainable and can help reduce the use of chemical pesticides and fungicides, which can have negative impacts on human health and the environment.
Bt - cotton to increase cotton yield:
Bt (Bacillus thuringiensis) is a soil bacterium that produces a protein that is toxic to many pest insects. Bt cotton is a genetically modified cotton that produces this protein, which reduces the need for chemical insecticides and increases cotton yield.
Nucleopolyhedrovirus against white rust in Brassica:
Nucleopolyhedrovirus is a virus that infects and kills certain insect pests, including the larvae of the diamondback moth, which is a major pest of Brassica crops. The use of this virus as a biological control agent can help reduce the need for chemical insecticides and improve crop yield.
Trichoderma sp. against certain plant pathogens:
Trichoderma is a genus of fungi that can be used as a biological control agent against certain plant pathogens, including Fusarium, Rhizoctonia, and Pythium species. Trichoderma sp. can colonize plant roots and produce enzymes that help control these pathogens, reducing the need for chemical fungicides and improving plant health.
All of above:
All of the above examples involve the use of microbes as a biological control agent to manage pests and diseases in plants. These methods are environmentally friendly and sustainable and can help reduce the use of chemical pesticides and fungicides, which can have negative impacts on human health and the environment.
Human insulin is being commercially produced from a transgenic species of[2008]- a)Escherichia
- b)Mycobacterium
- c)Rhizobium
- d)Saccharomyces
Correct answer is option 'A'. Can you explain this answer?
Human insulin is being commercially produced from a transgenic species of
[2008]
a)
Escherichia
b)
Mycobacterium
c)
Rhizobium
d)
Saccharomyces
|
|
Kunal Rane answered |
Human insulin is being commercially produced from a transgenic species of Escherichia coli. E. coli is a bacterium that is commonly found in the lower intestine of warm blooded animals. The bacteria can also be grown easily and its genetics are comparatively simple and easily manipulated, making it one of the best studied prokaryotic model organisms, and an important species in biotechnology.
Which one of the following help in absorption of phosphorus from soil by plants?[2011]- a)Glomus
- b)Rhizobium
- c)Frankia
- d)Anabaena
Correct answer is option 'A'. Can you explain this answer?
Which one of the following help in absorption of phosphorus from soil by plants?
[2011]
a)
Glomus
b)
Rhizobium
c)
Frankia
d)
Anabaena
|
Aniket Chawla answered |
Glomus aggregatum is a mycorrhizal fungus used as a soil inoculant in agriculture and horticulture. Its purpose is to increase the surface area of roots for nutrient absorption like phosphorus.
The aquatic fern, which is an excellent biofertiliser is[1999]- a)Azolla
- b)Salvinia
- c)Marsilia
- d)Pteridium
Correct answer is option 'A'. Can you explain this answer?
The aquatic fern, which is an excellent biofertiliser is
[1999]
a)
Azolla
b)
Salvinia
c)
Marsilia
d)
Pteridium
|
|
Krish Chakraborty answered |
Azolla is a freshwater fern harbouring a bluegreen alga - Anabaena in its leaf cavities. The alga fixes atmospheric nitrogen and releases nitrogenous compounds in leaf cavities. This symbiotic system is the main source of algal biofertilizer in rice fields.
Which one thing is not true about antibiotics?[1996]- a)The term “antibiotic” was coined by Selman Waksman in 1942
- b)First antibiotic was discovered by Alexander Flemming
- c)Each antibiotic is effective only against one particular kind of germ
- d)Some persons can be allergic to a particular antibiotic
Correct answer is option 'C'. Can you explain this answer?
Which one thing is not true about antibiotics?
[1996]
a)
The term “antibiotic” was coined by Selman Waksman in 1942
b)
First antibiotic was discovered by Alexander Flemming
c)
Each antibiotic is effective only against one particular kind of germ
d)
Some persons can be allergic to a particular antibiotic
|
Moumita Khanna answered |
'Each antibiotic is effective only against one particular kind of germ' is not correct.
Probiotics are[2007]- a)cancer inducing microbes
- b)new kind of food allergens
- c)live microbial food supplement
- d)safe antibiotics
Correct answer is option 'C'. Can you explain this answer?
Probiotics are
[2007]
a)
cancer inducing microbes
b)
new kind of food allergens
c)
live microbial food supplement
d)
safe antibiotics
|
|
Krish Chakraborty answered |
Probiotics are defined as live microorganisms, including Lactobacillus species, Bifidobacterium species and yeasts, that may beneficially affect the host upon ingestion by improving the balance of the intestinal microflora. The dietary use of live microorganisms has a long history.
A patient brought to a hospital with myocardial infarction is normally immediately given :[2012]- a)Penicillin
- b)Streptokinase
- c)Cyclosporin-A
- d)Statins
Correct answer is option 'B'. Can you explain this answer?
A patient brought to a hospital with myocardial infarction is normally immediately given :
[2012]
a)
Penicillin
b)
Streptokinase
c)
Cyclosporin-A
d)
Statins
|
|
Maheshwar Saini answered |
Streptokinase is immediately given to dissolve the thrombus carring myocardial infarction
Farmers have reported over 50% higher yields of rice by using the biofertilizer[1998]- a)Azolla pinnata
- b)Cyanobacteria
- c)Legume-Rhizobium symbiosis
- d)Mycorrhiza
Correct answer is option 'A'. Can you explain this answer?
Farmers have reported over 50% higher yields of rice by using the biofertilizer
[1998]
a)
Azolla pinnata
b)
Cyanobacteria
c)
Legume-Rhizobium symbiosis
d)
Mycorrhiza
|
|
Aniket Chawla answered |
Farmers have reported over 50% higher yields of rice by using the biofertilizer Azolla pinnata.
A common biocontrol agent for the control of plant diseases is[2010]- a)Baculovirus
- b)Bacillus thuringiensis
- c)Glomus
- d)Trichoderma
Correct answer is option 'D'. Can you explain this answer?
A common biocontrol agent for the control of plant diseases is
[2010]
a)
Baculovirus
b)
Bacillus thuringiensis
c)
Glomus
d)
Trichoderma
|
Pooja Saha answered |
A common biocontrol agent for control of plant diseases is Trichoderma. Trichoderma is a tree living fungus that exert biocontrol over several plant pathogens for the control of plant diseases. It is the natural method of pest and pathogen control.
Cryl endotoxins obtained from Bacillus thuringiensis are effective against[2008]- a)mosquitoes
- b)flies
- c)nematodes
- d)boll worms
Correct answer is option 'D'. Can you explain this answer?
Cryl endotoxins obtained from Bacillus thuringiensis are effective against
[2008]
a)
mosquitoes
b)
flies
c)
nematodes
d)
boll worms
|
|
Maheshwar Saini answered |
Cry I endotoxine obtained from Bacillus thuringiensis are effective against bollworms. A bollworm is a common term for any larva of a moth that attacks the fruiting bodies of certain crops, especially cotton.
Which one of the following microbes forms symbiotic association with plants and helps them in their nutrition[2012]- a)Azotobacter
- b)Aspergillus
- c)Glomus
- d)Trichoderma
Correct answer is option 'C'. Can you explain this answer?
Which one of the following microbes forms symbiotic association with plants and helps them in their nutrition
[2012]
a)
Azotobacter
b)
Aspergillus
c)
Glomus
d)
Trichoderma
|
Naveen Menon answered |
Glomus is endomycorrhiza that helps in absorption of nutrition specially phosphorus from soil.
Yeast is used in the production of[2012]- a)Citric acid and lactic acid
- b)Lipase and pectinase
- c)Bread and beer
- d)Cheese and butter
Correct answer is option 'C'. Can you explain this answer?
Yeast is used in the production of
[2012]
a)
Citric acid and lactic acid
b)
Lipase and pectinase
c)
Bread and beer
d)
Cheese and butter
|
|
Tejas Chavan answered |
Saccharomyces cervisiae is a yeast used in making bread (Baker’s yeast) and commercial production of ethanol.
Which one of the following is non-symbiotic biofertilizer?[1998]- a)Azotobacter
- b)Anabaena
- c)Rhizobium
- d)VAM.
Correct answer is option 'A'. Can you explain this answer?
Which one of the following is non-symbiotic biofertilizer?
[1998]
a)
Azotobacter
b)
Anabaena
c)
Rhizobium
d)
VAM.
|
|
Kunal Rane answered |
Azotobacter is a free living nitrogen fixing bacterium, Rhizobium is symbiotic and found in the root nodules of leguminous plants, Anabaena occurs in assoction with Azolla. VAM is vesicular arbuscular mycorrhiza.
Trichoderma harzianum has proved a useful microorganism for[2008]- a)bioremediation of contaminated soils
- b)reclamation of wastelands
- c)gene transfer in higher plants
- d)biological control of soil-borne plant pathogens
Correct answer is option 'D'. Can you explain this answer?
Trichoderma harzianum has proved a useful microorganism for
[2008]
a)
bioremediation of contaminated soils
b)
reclamation of wastelands
c)
gene transfer in higher plants
d)
biological control of soil-borne plant pathogens
|
|
Naveen Menon answered |
Trichoderma harzianum has proved a useful microorganism for biological control of soil borne plant pathogens. Trichoderma harzianum is a fungus that is also used as a fungicide. It is used for foliar application, seed treatment and soil treatment for suppression of various disease causing fungal pathogens. Commercial biotechnological products such as 3 Tac have been useful for treatment of Botrytis, Fusarium, Penicillium sp. It is also used for manufacturing enzymes.
Gobar gas contains mainly[1997]- a)CH4 + CO2
- b)CH4 + O2
- c)CO2 + H2
- d)CO2 + SO2
Correct answer is option 'A'. Can you explain this answer?
Gobar gas contains mainly
[1997]
a)
CH4 + CO2
b)
CH4 + O2
c)
CO2 + H2
d)
CO2 + SO2
|
|
Naveen Menon answered |
Gobar gas contains mainly CH4 + CO2.
Conversion of milk to curd improves its nutritional value by increasing the amount of [NEET 2018]- a)vitamin D
- b)vitamin A
- c)vitamin B12
- d)vitamin E
Correct answer is option 'C'. Can you explain this answer?
Conversion of milk to curd improves its nutritional value by increasing the amount of [NEET 2018]
a)
vitamin D
b)
vitamin A
c)
vitamin B12
d)
vitamin E
|
|
Muraad answered |
Curdling Or conversion of milk into curd improves its nutritional content by increasing the amount of cyanocobalamine or vitamin B12. Actually lactic acid reacts
with casein thereby enhancing Vitamin B12 content.
with casein thereby enhancing Vitamin B12 content.
Which of the following is likely to be achieved in the coming two decades?[1997]- a)A complete understanding of the brainmind interaction
- b)Control of cancer
- c)Correction of genetic basis of diabetes mellitus
- d)Production of biodegradable plastic rather than cellulose by higher plants
Correct answer is option 'B'. Can you explain this answer?
Which of the following is likely to be achieved in the coming two decades?
[1997]
a)
A complete understanding of the brainmind interaction
b)
Control of cancer
c)
Correction of genetic basis of diabetes mellitus
d)
Production of biodegradable plastic rather than cellulose by higher plants
|
Sonal Kulkarni answered |
Control of cancer is likely to be achieved in the coming two decades.
Monascus purpureus is a yeast used commercially in the production of :[2012]- a)ethanol
- b)streptokinase for removing clots from the blood vessels.
- c)Citric acid
- d)blood cholesterol lowering statins
Correct answer is option 'D'. Can you explain this answer?
Monascus purpureus is a yeast used commercially in the production of :
[2012]
a)
ethanol
b)
streptokinase for removing clots from the blood vessels.
c)
Citric acid
d)
blood cholesterol lowering statins
|
|
Kunal Rane answered |
Monascus purpureus is a yeast used in the production of statins which are used in lowering blood cholestrol.
A nitrogen-fixing microbe associated with Azolla in rice fields is :[2012]- a)Spirulina
- b)Anabaena
- c)Frankia
- d)Tolypothrix
Correct answer is option 'B'. Can you explain this answer?
A nitrogen-fixing microbe associated with Azolla in rice fields is :
[2012]
a)
Spirulina
b)
Anabaena
c)
Frankia
d)
Tolypothrix
|
|
Maheshwar Saini answered |
Anabaena azollae resides in the leaf cavities of the fern Anabaena. It fixes nitrogen. A part of the fixed nitrogen is excreted in the cavities and becomes available to the fern. The decaying fern plants release the same for utilization of the rice plants.
Which of the following is put into Anaerobic sludge digester for further sewage treatment? [NEET 2020]- a)Effluents of primary treatment
- b)Activated sludge
- c)Primary sludge
- d)Floating debris
Correct answer is option 'B'. Can you explain this answer?
Which of the following is put into Anaerobic sludge digester for further sewage treatment? [NEET 2020]
a)
Effluents of primary treatment
b)
Activated sludge
c)
Primary sludge
d)
Floating debris
|
Raghav Bansal answered |
Major portion of activated sludge is pumped into large tanks called anaerobic sludge digesters. So, here other kinds of bacteria which grow anaerobically, digest the fungi and bacteria of the sludge.
Which of the following can be used as a biocontrol agent in the treatment of plant disease? [NEET 2019]- a)Lactobacillus
- b)Trichoderma
- c)Chlorella
- d)Anabaena
Correct answer is option 'B'. Can you explain this answer?
Which of the following can be used as a biocontrol agent in the treatment of plant disease? [NEET 2019]
a)
Lactobacillus
b)
Trichoderma
c)
Chlorella
d)
Anabaena
|
Mira Joshi answered |
Trichoderma species are free-living fungi that are very common in the root ecosystems. They are effective biocontrol agents of several plant pathogens.
Which of the following in sewage treatment removes suspended solids? [NEET 2017]- a)Secondary treatment
- b)Primary treatment
- c)Sludge treatment
- d)Tertiary treatment
Correct answer is option 'B'. Can you explain this answer?
Which of the following in sewage treatment removes suspended solids? [NEET 2017]
a)
Secondary treatment
b)
Primary treatment
c)
Sludge treatment
d)
Tertiary treatment
|
|
Muraad answered |
Primary treatment involves elimination of suspended solids and particles. so, option B is absolutely correct.
Two microbes found to be very useful in genetic engineering are[2006]- a)Vibrio cholerae and a tailed bacteriophage
- b)Diplococcus sp. and Pseudomonas sp.
- c)Crown gall bacterium and Caenorhabditis elegans
- d)Escherichia coli and Agrobacterium tumefaciens
Correct answer is option 'D'. Can you explain this answer?
Two microbes found to be very useful in genetic engineering are
[2006]
a)
Vibrio cholerae and a tailed bacteriophage
b)
Diplococcus sp. and Pseudomonas sp.
c)
Crown gall bacterium and Caenorhabditis elegans
d)
Escherichia coli and Agrobacterium tumefaciens
|
|
Maheshwar Saini answered |
Escherichia coli is a bacterium found in human colon. On this bacterium scientists have made extensive genetic experiments to make some vital chemicals like insulin. Another bacterium is Agrobacterium tumefaciens which causes crown gall in plants is extensively used for genetic experiments.
Match List - I with List - II [NEET 2021]
Choose the correct answer from the options given below.
- a)(a)
- b)(b)
- c)(c)
- d)(d)
Correct answer is option 'C'. Can you explain this answer?
Match List - I with List - II [NEET 2021]
Choose the correct answer from the options given below.
Choose the correct answer from the options given below.
a)
(a)
b)
(b)
c)
(c)
d)
(d)
|
|
Suresh Iyer answered |
Examples of acid producers are Aspergillus niger (a fungus) of citric acid, Acetobacter aceti (a bacterium) of acetic acid; Clostridium butylicum (a bacterium) of butyric acid and Lactobacillus (a bacterium) of lactic acid.
Chapter doubts & questions for Microbes in Human Welfare - NEET Past Year Papers 2025 is part of NEET exam preparation. The chapters have been prepared according to the NEET exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for NEET 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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