Microbes in Human Welfare

Consider the following statements (A-D) about organic farming. Which of these statements are correct?

1. (B) and (C) only
2. (B), (C) and (D)
3. (C) and (D) only
4. (A) and (B) only

Which one of the following is a wrong matching of a microbe and its industrial product, while the remaining three are correct?

1. Acetobacter aceti – acetic acid
2. Clostridium butylicum – lactic acid
3. Aspergillus niger – citric acid
4. Yeast – statins

The most common substrate used in distilleries for the production of ethanol is :

1. Ground gram
2. Molasses
3. Soyabean
4. Corn meal

Which one of the following is not a biofertilizer ?

1. Agrobacterium
2. Nostoc
3. Rhizobium
4. Mycorrhiza

Secondary sewage treatment is mainly a :

1. Mechanical process
2. Chemical process
3. Biological process
4. Physical process

Which of the following is mainly produced by the activity of anaerobic bacteria on sewage ?

1. Propane
2. Mustard gas
3. Marsh gas
4. Laughing gas

An organism used as a Biofertilizer for raising soyabean crop is :

1. Azotobacter
2. Azospirillum
3. Nostoc
4. Rhizobium

Ethanol is commercially produced through a particular species of :

1. Clostridium
2. Trichoderma
3. Aspergillus
4. Saccharomyces

Continuous addition of sugars in 'fed batch' fermentation is done to :

1. obtain antibiotics
2. produce methane
3. purify enzymes
4. degrade sewage

Organisms called Methanogens are most abundant in a :

1. Polluted stream
2. Hot spring
3. Cattle yard
4. Sulphur rock