Tag: microbes in human welfare

Quizzes (8) Questions (107)

Questions Related to microbes in human welfare

Multiple choice zoology microbes in human welfare biogas environmental use of microorganism microbes in waste treatment and biogas

Primary sludge is used for

  1. Preparation of compost

  2. Preparation of manure

  3. Biogas production

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Primary sludge is the solid material removed during the primary sedimentation process of sewage treatment. It is organic-rich and can be processed via anaerobic digestion for biogas production, composting, or manure preparation.

Multiple choice zoology microbes in human welfare biogas environmental use of microorganism microbes in waste treatment and biogas

Primary treatment of sewage is

  1. Physical process

  2. Biological process

  3. Chemical process

  4. Biochemical process
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Primary treatment of sewage involves physical processes like sedimentation and filtration to remove large particles and suspended solids. It does not involve biological or chemical degradation.

Multiple choice zoology microbes in human welfare biogas environmental use of microorganism microbes in waste treatment and biogas

Sewage treatment process includes all of these features, except

  1. A small part of the activate sludge is pumped back into the aeration tank to serve as incoculum

  2. Activated sludge cannot be used in anaerobic digestion process

  3. Anaerobic bacteria digest aerobic bacteria in sludge digesters

  4. Transfer of primary effluent in aeration tanks
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The process of removal and digestion of inorganic and organic waste present in the sewage water is called sewage treatment.

A. The flocs of bacteria obtained after treatment of the sewage water is called activated sludge. A small part of it is pumped back into the aeration tank which will act as inoculum and will multiply to start the digestion of organic compounds again.
B. Activated sludge can be anaerobic bacterium as well.
C. In sludge digesters, the digestion of organic compounds occurs.
D. Primary effluent is transferred to the aeration tanks for the purpose of digestion through aerobic bacteria.
Hence, the correct answer is 'Anaerobic bacteria digest aerobic bacteria in sludge digesters'.

Multiple choice zoology microbes in human welfare biofertilizers microbes as biocontrol agents and biofertilizers manuring

Which of the following statements is/are incorrect ?
(i) Cyanobacteria are autotrophic microbes widely distributed in aquatic and terrestrial habitats.
(ii) Anabaena, Nostoc and Oscillatoria are photosynthetic $N _2$ - fixing cyanobacteria.
(iii) Tolypothrix (BGA) can increase rice production by about 20%.
(iv) BGA add organic matter to the soil and increase its fertility.
(v) In our country, fertilizers are not available commercially in the markets for farmers.

  1. (v) Only

  2. (iv) Only

  3. (iii) Only

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Biofertilizers are available commercially in our country for farmers.

So, the correct option is '(v) Only'

Multiple choice zoology microbes in human welfare biofertilizers microbes as biocontrol agents and biofertilizers manuring

Which one of the following microorganisms forms a symbiotic association with plants and helps them in their nutrition?

  1. Glomus

  2. Azotobacter

  3. Klebsielfa

  4. Azospirillium
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Several fungi are known to form symbiotic associations with plants, i.e., mycorrhiza. The most common fungal partners of mycorrhiza are Glomus species.

Multiple choice zoology microbes in human welfare biofertilizers microbes as biocontrol agents and biofertilizers manuring

Study the following statements and select the correct ones.


(i) Methanogens are archaebacteria that produce methane in marshy areas.
(ii) Nostoc is a filamentous blue-green alga which fixes atmospheric nitrogen.
(iii) Many members of the genus Glomus form mycorrhiza.

  1. (i) and (ii)

  2. (i) and (iii)

  3. (ii) and (iii)

  4. (i), (ii) and (iii)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
1. Methanogens are archaebacteria belong to the domain of archaea, commonly found in wet, marshy areas,  They produce methane gas.
2. Nostoc is the filamentous blue-green alga. They form gelatin body which contains trichomes.
3. Glomus and it's all species form symbiotic relationships (mycorrhizas) with plant roots. 
So the correct answer is option D.

Multiple choice zoology microbes in human welfare biofertilizers microbes as biocontrol agents and biofertilizers manuring

Which of the following statements is/are correct ?

  1. In paddy fields, cyanobacteria serve as an important biofertiliser.

  2. Vermicompost consists of organic matter prepared by the action of earthworms on human or animal waste.

  3. The important examples of cyanobacteria as biofertilisers are Anabaena, Nostoc and Oscoilatoria.

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer