Microbes in Human Welfare

What does a high value of BOD(Biochemical Oxygen Demand) indicate?

• That water is pure

• that water is less polluted

• that water is highly polluted

• that consumption of organic matter by microbes is higher in the water

What gases are produced in anaerobic sludge digesters?

• Methane and CO₂ only

• Methane, Hydrogen sulphide and CO₂

• Methane, hydrogen sulphide and O₂

• Hydrogen sulphide and CO₂

Monascus purpureus is a yeast used commercially in the production of

• ethanol

• streptokinase for removing clots from the blood vessels.

• citric acid

• blood cholesterol lowering statins.

The technology of biogas production in India has been developed by the efforts of:

A. Khadi and Village Industries Commision (KVIC)

B. Indian Council of Agricultural Research (ICAR)

C. Indian Agricultural Research Institute (IARI)

D. Indian Council of Medical Research (ICMR)

• A, C, D

• C, D

• A, C

• A, B

The gas responsible for puffing-up appearance of dough comes from:

• Aerobic respiration

• Fermentation

• Photosynthesis

• Photorespiration

Acetic acid is produced by a:

• Fungus

• Bacterium

• Yeast

• Virus

Which of the following bacteria has a role in removing clots from our blood vessels?

• Bacillus thuringiensis

• Clostridium butylicum

• Streptococcus

  
  

• Lactobacillus

Statins used for lowering blood-cholesterol level are extracted from:

• Algae

• Bacteria

• Virus

• Yeast

The amount of oxygen required by the microbes in the decomposition of organic matter is called:

• Chemical oxygen demand

• Biological oxygen demand

• Biochemical oxygen demand

• Dissolve oxygen

The solids which settle after primary treatment of sewage are called:

• Primary sludge

• Activated sludge

• Flocs

• Total solids