Microorganisms Friend And Foe Test - 6

The living organism around us which cannot be seen with our naked eyes alone is known as Microorganisms or microbes.

Rhizobium lives in the root nodules of leguminous plants, such as beans and peas, with which it has a symbiotic relationship.

The bacteria Lactobacillus promotes the formation of curd.

Microorganisms or microbes that cause diseases are generally harmful microorganisms. Such disease-causing microorganisms are known as Pathogens. There are some insects and animals which act as carriers of these disease-causing microorganisms.

Sometimes nitrogen gets fixed through the action of lightning.

Some of the microorganism cause diseases in human beings, plants and animals. Such disease-causing microorganisms are called pathogens. Hence, A is the correct answer.

Female Anopheles mosquito carries the parasite of Malaria(plasmodium). Hence, A is the correct answer.

Typhoid is caused by bacteria with the mode of transmission as water. Preventive measures for typhoid are:

(i) Maintain personal hygiene and good sanitary habits.

(ii) Consume properly cooked food and boiled drinking water.

(iii) Vaccination.

Hence, D is the correct answer.

Microbial diseases that can spread from an infected person to a healthy person through the air, water, food or physical contact are called communicable diseases. Examples of such diseases include cholera, common cold, chicken pox and tuberculosis. Hence, D is the correct answer.

Anthrax is a dangerous human and cattle disease caused by a bacterium. Hence, A is the correct answer.