Tag: biogas

Questions Related to 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 
zoology bioenergy biogas environmental use of microorganism microbes in waste treatment and biogas

  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)

Show answer
Correct Option: D
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)'

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:

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

  1. primary treatment

  2. activated sludge treatment

  3. tertiary treatment

  4. none of these.

Show answer
Correct Option: B
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'

Biogas is produced by:

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

  1. Aerobic breakdown of biomass

  2. Anaerobic breakdown of biomass

  3. With the help of methanogenic bacteria

  4. Both (b) and (c)

Show answer
Correct Option: D
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).

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

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

  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.

Show answer
Correct Option: C
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' .

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

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

  1. Cyclic treatment

  2. Primary treatment

  3. Tertiary treatment

  4. Activated sludge treatment

Show answer
Correct Option: D
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

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

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

  1. Ethane

  2. Methane

  3. Propane

  4. Acetylene

Show answer
Correct Option: B
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.  

Polluted water can be purified by using

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

  1. Micro-organisms

  2. Algae

  3. Pesticides

  4. Fishes

Show answer
Correct Option: A
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.

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

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

  1. Carbon dioxide

  2. Methane

  3. Hydrogen

  4. Nitrogen dioxide

Show answer
Correct Option: B
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.

Bacteria involved in formation of gobar gas are

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

  1. Obligate aerobes

  2. Facultative anaerobes

  3. Obligate anaerobes

  4. Both B and C

Show answer
Correct Option: D
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'. 

Methanogens growing anaerobically on cellulosic material produce

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

  1. Methane

  2. Methane and hydrogen

  3. Methane and carbon dioxide

  4. Methane, carbon dioxide and hydrogen

Show answer
Correct Option: D