Tag: biogas

Questions Related to 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

Show answer
Correct Option: B

Temperature suitable for biogas production is

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

  1. $35^o-40^o$C

  2. $20^o-25^o$C

  3. $30^o-35^o$C

  4. $40^o-44^o$C

Show answer
Correct Option: A
Explanation:
Biogas production occurs by the action of anaerobic bacteria on waste materials or raw materials. The reactions are made to occur in specially designed large sized tanks called digesters. The bacteria that decompose  the raw materials and produce biogas can be thermophilic if they survive at a higher temperature or mesophilic if they survive at a moderate temperature. Mesophilic bacteria are active at an optimum temperature of 35° - 40°C and thermophilic bacteria are active at an optimum temperature of 50° - 55°C . 
Hence, option A matches the correct temperature suitable for biogas production.
So, the correct answer is '35° - 40°C'.

The process that provides both energy and manure is

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

  1. Burning of fuel wood

  2. Pyrolysis of wood

  3. Gasification of wood and wood shavings

  4. Biogas formation

Show answer
Correct Option: D

The technology of biogas production was developed in India through the efforts of

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

  1. KVIC

  2. IARI

  3. Both A and B

  4. WHO

Show answer
Correct Option: C

A peculiar odour that occurs in marshy areas and cowsheds is due to gas produced by.

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

  1. Cyanobacteria

  2. Archaebacteria

  3. Mycoplasma

  4. Slime Moulds

Show answer
Correct Option: B
Explanation:

The odour is due to the gases produced  by the bacteria Methanogens which belong to Archaebacteria.

Correct answer-B

Match and find the correct combination.

(a) Fermenting malted cereals and fruit juice (i) Clots in Blood vessels
(b) Production of large holes in Swiss cheese (ii) Digestion of sludge by bacteria and fungi resulting in emission methane and other gases
(c) Myocardial infarction (iii) Production of ethanol
(d) Biogas (iv) Blood cholesterol lowering agent
(v) Production of large amount of CO$ _2$
zoology bioenergy biogas environmental use of microorganism microbes in waste treatment and biogas

  1. a-iii, b-v, c-iv, d-ii

  2. a-i, b-ii, c-iii, d-iv

  3. a-iii, b-v, c-i, d-ii

  4. a-v, b-iv, c-iii, d-ii

Show answer
Correct Option: C

Identify the correct pair of characters of a bacterium which is used in the production of methane.
(i)   Recyclers of inorganic nutrients
(ii)  Present in stomach of cattle
(iii) Obtain energy from sunlight
(iv) Aerobes

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

  1. ii, iii

  2. i, ii

  3. i, iv

  4. iii, iv

Show answer
Correct Option: B

The order of bacteria active in conversion of organic wastes into biogas is

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

  1. Hydrolytic $\rightarrow$ Acetogenic $\rightarrow$ Methanogenic

  2. Methanogenic $\rightarrow$ Acetogenic $\rightarrow$ Hydrolytic

  3. Methanogenic $\rightarrow$ Hydrolytic $\rightarrow$ Acetogenic

  4. Acetogenic $\rightarrow$ Methanogenic $\rightarrow$ Hydrolytic

Show answer
Correct Option: A
Explanation:

The order of bacteria active in the conversion of organic wastes into biogas is hydrolytic, acetogenic, methanogenic. 

Hydrolytic- Insoluble organic polymers, such as carbohydrates, are broken down to soluble derivatives which are used by bacteria.

Acetogenic- Acidogenic bacteria then convert the sugars and amino acids into carbon dioxide, hydrogen, ammonia, and organic acids. These bacteria convert these resulting organic acids into acetic acid, along with additional ammonia, hydrogen, and carbon dioxide.

Methanogenic- The methanogens convert the product of acetogenic step to methane and carbon dioxide. The produced gas consisting of methane, carbon dioxide, and traces of other ‘contaminant’ gases is known as biogas.

So, the correct answer is 'Hydrolytic $\rightarrow$ Acetogenic $\rightarrow$ Methanogenic'.

Biogases produced during sewage treatment are 

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

  1. ${H} _{2}S, \,{N} _{2}, \,{CH} _{4}$

  2. ${CH} _{4}, \,{H} _2{S}, \,{CO} _{2}$

  3. ${CH} _{4}, \,{O} _{2}, \,H _2S$

  4. $H _2S, \,CH _4, \,SO _2$

Show answer
Correct Option: B
Explanation:

The Biogases produced during sewage treatment are

1.Methane (CH$ _4$)
2.Hydrogen sulfide (H$ _2$S)
3.Carbon-dioxide (CO$ _2$).
So, the correct option is 'CH$ _4$, H$ _2$S, CO$ _2$'.

Cytophaga and Cellulomonas are involved in

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

  1. Biogas production

  2. Spoilage of textiles

  3. Curing of tea and tobacco

  4. Cheese manufacture

Show answer
Correct Option: A
Explanation:

Cytophaga is a genus of Gram-negative bacillus. Cellulomonas is a genus of Gram-positive bacillus. They have the ability to digest cellulose. They are called as cellulolytic bacteria. They are involved in biogas production. 

Thus, the correct answer is 'Biogas production.'