Bacillus thuringiensis (Bt) strains have been used for designing novel:

1. Bioinsecticidal plants

2. Bio-mineralization processes

3. Biofertilizers

4. Bio-metallurgical techniques 

Which of the following yields citric acid?
1.  Penicillium citrinum
2. Aspergillus niger
3. Saccharomyces
4.  Azospirillium

Saccharomyces cerevisiae is used in the formation of:
1. Ethanol
2. Methanol
3. Acetic acid
4. Antibiotics

The dough kept overnight in warm weather becomes soft and spongy because of:

1. Fermentation

2. Cohesion

3. Osmosis

4. Absorption of carbon dioxide from the atmosphere

Which one of the following pairs is not correctly matched:

1. Serratia – Drug addiction

2. Spirulina – Single-cell protein

3. Rhizobium – Biofertilizer

4. Streptomyces – Antibiotic 

A major component of gobar gas is:

1. Methane

2. Ethane

3. Butane

4. Ammonia 

Azolla is used in the cultivation of:

Which one produces gas by decomposing the gobar (Dung) in gobar gas:
1.  Fungus
2.  Virus
3.  Methanogenic bacteria
4.  Algae

Which bacteria is utilized in a Gobar gas plant:

1. Methanogens

2. Nitrifying bacteria

3. Ammonifying bacteria

4. Denitrifying bacteria

During the formation of bread it becomes porous due to the release of CO₂ by the action of: