Test: Microbes in Production of Biogas (NCERT) - NEET MCQ

A - Sludge
B - Gas holder
C - dung+water

Biogas is a methane-rich fuel gas produced by anaerobic breakdown or digestion of biomass with the help of methanogenic bacteria. Biogas is made up of methane (50-70%), carbon dioxide (30%-40%) with traces of nitrogen, hydrogen sulphide and hydrogen. 

Methanobacterium is found in the rumen (a part of the stomach) of cattle. A lot of cellulosic material is also available in the rumen. In rumen, these bacteria help in the breakdown of cellulose and play an important role in nutrition of cattle.

• Methanogens produce methane.
• Fermentors are large vessels for growing microbes.
• Organic waste in water increase BOD.
• Biogas is methane rich fuel gas.

Word antibiotic is a misnomer. Anti is a Greek word that means 'against', and bios means 'life', together they mean 'against life' (in the context of disease-causing organisms); whereas with reference to human beings, they are 'pro life' and not against. Flocs are masses of bacteria with interwoven fungal filaments which form mesh-like structures. Components of biogas are methane (50 70%); carbon dioxide (30-40%) and traces of hydrogen, nitrogen and H₂S.

Methanogens are microorganisms that produce methane as a metabolic by product in anoxic condition. They include Methanobacterium, Methanobrevibacter and Methanococcus.

In stage - I, anaerobic microorganisms bring about enzymatic breakdown of complex organic compounds into simple soluble compounds or monomers.
In stage - II, monomers are converted into organic acids by fermentation causing microbes.
In stage - Ill, organic acids are acted upon by methanogenic bacteria to produce biogas.

Secondary treatment is also called biological treatment or microbial degradation. It is mainly a biological process. Biogas is a mixture of gases, containing predominantly methane (50-70%), CO₂ (30-40%) and traces of hydrogen, H₂S and nitrogen.

• Biogas is a methane rich fuel gas produced by anerobic breakdown or digestion of biomass with the help of methanogenic bacteria.
• Biogas is a mixture of gases, containing predominantly methane (50-70%), CO₂ (30-40%) and traces of hydrogen, H₂S and nitrogen.

Strains are produced by Monascus purpureus. Dung is used to producing Biogas. Saccharomyces cerevisiae is used in the production of ethanol.  Cyclosporin A is obtained from Trichoderma polysporum.