Microorganisms Friend And Foe Test - 16

Vaccines are dead or weakened microorganisms which, when injected into the body of a healthy person, protect the person from disease-causing microorganisms by initiating the production of antibodies.

The correct answer is A.

Vaccines are not available for malaria.

The correct answer is D.

Blue-green algae are microorganisms which fix atmospheric nitrogen in the soil, thereby increasing the fertility of soil.

The correct answer is C.

Cholera is a communicable disease that can spread from an infected person to a healthy person through water.

The correct answer is B.

Microorganisms decompose organic wastes of plants and animals. Since pot I contains vegetable peels, its contents will be decomposed by the microorganisms present in soil.

The correct answer is A.

Typhoid is not caused by viruses. It is caused by bacteria called Salmonella typhi.

The correct answer is B.

The female Aedes mosquito is the carrier of dengue virus.

The correct answer is D.

Measles is a viral disease that is transferred from an infected person to a healthy person through air.

The correct answer is A.

Tuberculosis is a human disease that occurs because of bacterial infection.

The correct answer is A.

Mosquitoes are the carriers of the malaria-causing protozoa. These mosquitoes require water for breeding. Hence, one must avoid the accumulation of water in and around one’s neighbourhood.

The correct answer is A.

Typhoid is a water-borne disease. It is bacterial disease that occurs because of the consumption of contaminated water.

The correct answer is B.

The foot and mouth disease is a viral disease. It occurs in cattle.

The correct answer is D.

Avoiding the accumulation of water in one’s surroundings helps prevent the breeding of mosquitoes, thereby the occurrence of malaria. However, this measure does not help prevent the occurrence of diseases that are transmitted through air.

The correct answer is D.

Common salt prevents the growth of bacteria in food items. Hence, it is used for preserving meat and fish for a long period of time.

The correct answer is A.

Citrus canker and rust of wheat are plant diseases. They are caused by bacteria and fungi respectively.

The correct answer is A.

Bacteria and blue-green algae are microorganisms which fix atmospheric nitrogen in soil. They convert atmospheric nitrogen into nitrogenous compounds, which can be easily taken up by plants.

The correct answer is B.

In order to prevent the growth of microorganisms, milk is first heated to a temperature of about 70°C for 15 to 30 seconds. It is then suddenly chilled and stored. This process is known as pasteurisation. Oil and vinegar are used for preventing the spoilage of vegetables.

The correct answer is A.

Microorganisms are living organisms which cannot be seen with the naked eye. Hence, plants cannot be categorized as microorganisms.

The correct answer is D.

Bacteria and fungi convert nitrogenous wastes into nitrogen compounds by the process of decomposition.

The correct answer is A.

During the process of respiration, yeast releases carbon dioxide, which comes out of the dough by forming pores in it. These pores increase the volume of the dough.

The correct answer is A.

Lactobacillus is used in the preparation of curd.

The correct answer is A.

Antibiotics are obtained from bacteria and fungi.

The correct answer is A.

Yeast is used in the large scale production of alcohol and wine. They break down natural sugars into alcohol by the process of fermentation.

The correct answer is A.