Tag: zoology

Questions Related to zoology

Raw material used in formation of producer gas is

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

  1. Saw dust and wood chips

  2. Crop residue

  3. Agroindustry wastes

  4. All of the above

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Correct Option: D

Producer gas differs from biogas in having

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

  1. Methane

  2. Carbon monoxide

  3. $CO _2$

  4. Formed by fermentation

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Correct Option: B

Primary sludge is used for

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

  1. Preparation of compost

  2. Preparation of manure

  3. Biogas production

  4. All of the above

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Correct Option: D

Methanogens converts

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

  1. Methyl alcohol into methane

  2. Formic acid into methane

  3. Acetic acid into methane

  4. All of the above

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Correct Option: D

Primary treatment of sewage is

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

  1. Physical process

  2. Biological process

  3. Chemical process

  4. Biochemical process

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Correct Option: A

Biogas production is

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

  1. Single step aerobic process

  2. Two step aerobic process

  3. Three step aerobic process

  4. Three step anaerobic process

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Correct Option: D

Sewage treatment process includes all of these features, except

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

  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

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Correct Option: C
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'.

Anaerobic sludge digesters and inoculums are part and parcel of _____________.

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

  1. Primary sluge

  2. Activated sludge

  3. BOD

  4. FIocs

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Correct Option: A
Explanation:

Anaerobic digestion is a collection of a process by which microorganism break down biodegradable material in the absence of oxygen and some of these processes are used in the waste Industries to manage the waste. Primary sludge is a result of the capture of suspended solids and organics materials. In the primary process of waste management, the material is treated in a variety of ways. During the biological treatment of the waste a part of activated sludge is used as inoculum and they are passed into the last tank which is known as anaerobic sludge digester. The microorganism present in the sludge gets killed.


So, the correct option is 'Primary sludge'.

Which of the following is correct about biogas?

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

  1. Methane gas is produced along with ethyl alcohol by methanogen

  2. Methanogens acts on cellulose and release biogas

  3. Biogas is produced by thunder and lightening

  4. Maximum gas found in biogas is $CO _2$

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Correct Option: B
Explanation:
  • Methanogens are present in the rumen of cattle that is present in dung as well. Methanogens acts on the cellulose content of the and  It helps in the production of methane gas that is a component of biogas.
  • Hence Methanogens acts on cellulose and release biogas is a correct statement.
  • So, the correct answer is 'Methanogens acts on cellulose and release biogas'.

Biogas production is rate limited by

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

  1. Production of methane

  2. Cellulose digestion

  3. Conversion of monomers to organic acids

  4. None of the above

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Correct Option: B