Microbes in Human Welfare
Test 5

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following is responsible for large holes in Swiss cheese?

Saccharomyces cerevisiae
Propionibacterium shermanii
Penicillium roqueforti
Lactobacillus
2

Propionibacterium shermanii produces CO₂ gas, forming large holes in Swiss cheese.

Which microorganism is used for the industrial production of lactic acid?

Saccharomyces cerevisiae
Aspergillus niger
Lactobacillus
Acetobacter
3

Lactobacillus is used for the industrial production of lactic acid.

Which of the following is a fungal biocontrol agent for plant pathogens?

Bacillus thuringiensis
Trichoderma
Aspergillus
Rhizobium
2

Trichoderma is a fungal biocontrol agent used against plant pathogens.

Which of the following statements about Single Cell Protein (SCP) is correct?

SCP is produced only from fungi.
Spirulina is used for SCP production.
SCP has low protein content.
SCP is not suitable for human consumption.
2

Spirulina, a cyanobacterium, is widely used for SCP production due to its high protein content.

Which of the following microbes is used in the commercial production of citric acid?

Saccharomyces cerevisiae
Aspergillus niger
Acetobacter aceti
Pseudomonas
2

Aspergillus niger is used for large-scale citric acid production.

Which of the following statements regarding Bt toxin is incorrect?

Bt toxin is inactive inside bacterial cells.
Bt toxin becomes active in the alkaline gut of insects.
Bt toxin affects human intestinal cells.
Bt toxin is widely used in genetically modified crops.
3

Bacillus thuringiensis (Bt) toxin is specific to insect larvae and does not affect human intestinal cells.

Which of the following microbes is commonly used in the fermentation of traditional foods like soy sauce?

Rhizopus
Saccharomyces
Aspergillus
Lactobacillus
3

Aspergillus species are used in the fermentation process to produce soy sauce.

Which of the following bacteria is used in detergent formulations to remove oily stains?

Escherichia coli
Pseudomonas
Streptococcus
Lactobacillus
2

Pseudomonas produces lipases used in detergents to break down oily stains.

Which of the following microbes is commonly used for Single Cell Protein (SCP) production?

Saccharomyces cerevisiae
Methanobacterium
Spirulina
Clostridium
3

Spirulina, a cyanobacterium, is widely used for Single Cell Protein (SCP) production.

Which of the following is an example of a cyanobacterium used as a biofertilizer?

Anabaena
Rhizobium
Aspergillus
Bacillus
1

Anabaena is a nitrogen-fixing cyanobacterium used as a biofertilizer.

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