Tag: environmental use of microorganism

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Questions Related to environmental use of microorganism

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

What would happen if oxygen availability to activated sludge flocs is reduced ?

  1. It will slow down the rate of degradation of organic matter.

  2. The center of flocs will become anoxic, which would cause death of bacteria and eventually breakage of flocs.

  3. Flea would Increase in size as anaerobic bacteria would grow around flocs.

  4. Protozoa would grow in large numbers.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Oxygen is very important for the microorganism to break down and degrade the organic matter which is present in the sewage or the activated sludge. If the oxygen availability of the activated sludge floc is reduced then the degradation rate will slow down.

So, the correct option is 'it will slow down the rate of degradation of organic matter'

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

Match column I with column II and select the correct answer from the given codes. 

Column I  Column II
A, Methanogens (i) BOD
B. Fermentors (ii) Methane rich fuel gas
C. Organic waste in water (iii) Production of methane
D. Biogas  (iv) Large vessels for growing microbes 

  1. A-(ii), B-(iv), C-(iii), D-(i)

  2. A-(iv), B-(iii), C-(ii), D-(i)

  3. A-(ii), B-(i), C-(iv), D-(iii)

  4. A-(iii), B-(iv), C-(i), D-(ii)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Methanogens produce methane.
Fermentors are large vessels for growing microbes.
Organic waste in water increase BOD.
Biogas is methane rich fuel gas.
So, the correct option is 'A-(iii), B-(iv), C-(I), D-(ii)'
Multiple choice zoology microbes in human welfare biogas environmental use of microorganism microbes in waste treatment and biogas

A sewage treatment process in which a part of decomposer bacteria present in the wastes is recycled into the starting of the process is called as:

  1. primary treatment

  2. activated sludge treatment

  3. tertiary treatment

  4. none of these.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
A sewage treatment process in which a part of decomposer bacteria present in the wastes is recycled into the starting of the process is called activated sludge treatment .
So, the correct option is 'activated sludge treatment'
Multiple choice zoology bioenergy biogas environmental use of microorganism microbes in waste treatment and biogas

Biogas is produced by:

  1. Aerobic breakdown of biomass

  2. Anaerobic breakdown of biomass

  3. With the help of methanogenic bacteria

  4. Both (b) and (c)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Biogas is a mixture of gases consists primarily methane and carbon dioxide  that produced by the breakdown of organic substance into such gases  in complete lack of oxygen. This biogas production can only be done by anaerobic breakdown of biomass. As methanogens are also anaerobic bacteria. The correct answer must be 'Both (b) and (c).

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

The technology of biogas production from cow dung was developed in India largely due to the efforts of:

  1. Gas Authority of India

  2. Oil and Natural Gas Commission

  3. Indian Agricultural Research Institute and Khadi & Village Industries Commission

  4. Indian Oil Corporation.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The technology of biogas production from cow dung was developed in India largely due to the efforts of Indian Agricultural Research Institute (IARI) and Khadi & Village Industries Commission (KVIC) .

So, the correct option is 'Option C' .

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

Sewage treatment process in which part of decomposer bacteria is recycled into starting of the process is called.

  1. Cyclic treatment

  2. Primary treatment

  3. Tertiary treatment

  4. Activated sludge treatment
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A part of the activated sludge is pumped back into the aeration tank to serve as an inoculum in activated sludge treatment.

Correct answer-D

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

What does gobar gas produced from animal and plant waste contain?

  1. Ethane

  2. Methane

  3. Propane

  4. Acetylene
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Biogas is also commonly known as gobar gas. The biogas is produced due to anaerobic decomposition of the organic waste matter from the plants and animals with the help of microorganisms. The composition of biogas is methane and carbon dioxide. There are traces of hydrogen, nitrogen, hydrogen sulphide and carbon monoxide. The major component is of methane which accounts for 50-70%. Methane forms the clear and non-polluting gas and commonly used as a fuel.

Thus, the correct answer is option B.  

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

Polluted water can be purified by using

  1. Micro-organisms

  2. Algae

  3. Pesticides

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

Water pollution due to organic sources like pollution due to sewage can be prevented by treating sewage before passing into the water course, in sewage or effluent treatment plants (ETP). Domestic sewage primarily contains biodegradable organic matter, which readily decomposes by bacteria and other micro-organisms, which can multiply by using these organic substances as substrates and hence reduce some of the components of sewage. Thus, the correct answer is option A.

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

Which one of the following is a major constituent of Biogas?

  1. Carbon dioxide

  2. Methane

  3. Hydrogen

  4. Nitrogen dioxide
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Biogas is a mixture of mostly methane and carbon dioxide with trace amounts of other gases and is considered as a valuable renewable energy source.
  • Methane comprises of 45-70% of biogas and thus biogas is inflammable. It produces a deep blue flame and can be used as an energy source.
Multiple choice zoology bioenergy biogas environmental use of microorganism microbes in waste treatment and biogas

Bacteria involved in formation of gobar gas are

  1. Obligate aerobes

  2. Facultative anaerobes

  3. Obligate anaerobes

  4. Both B and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Biogas is produced from the fermentation of organic matter by the action of microbes. Such microbes are anaerobic i.e. they carry out fermentation in the absence of oxygen. Microbes which produce biogas are methanogenic bacteria which can be obligate anaerobes or they can be facultative anaerobes. Obligate anaerobes function only in absence of oxygen i.e. anaerobic conditions. Facultative anaerobes are the bacteria which normally function in aerobic conditions but they can switch to anaerobic respiration if oxygen is absent. Hence, both options B and C are correct.
So, the correct answer is 'Both B and C'.