Question

short note on harm caused by microorganisms

Answer 1

Some microorganisms harm us in various ways. Many organisms cause diseases. Disease causing microorganisms are called pathogens. Ailments like cold, influenza (flu) and most coughs are caused by viruses and even foot and mouth disease of cattle is also caused to virus. Serious diseases like, chicken pox and polio are also caused by viruses. Diseases like dysentery and malaria are caused by protozoan. Some bacteria cause typhoid and tuberculosis (TB) anthrax, a dangerous human and cattle disease, is also caused by a bacteria. Some microorganisms spoil leather items and wooden-work. Apart from these harmful effects, some microorganisms release toxic substances when grow on food items. Thus we see that microorganisms harm us in many ways.

Answer 2

microorganism can be harmful to us in the following ways. 1) they can cause disease in human ,plants and animals. microorganisms that can cause disease in man , animals and plants are called pathogens or germs. diseases spread through air : communicable disease like common cold and tuberculosis can spread through droplet . when an infected person coughs or sneezes , the pathogens travel through air and reach the healthy person may cause infection. vector - borne disease : flies are common culprits that breed diseases. flies may sit on dirt and garbage when pathogens stick to their bodies. if food is left uncovered ,that flies carrying germs sit on it and contaminate it . consuming such contaminated food and water causes diseases. 2) they can spoil the food: many bacteria and fungi grow on food items and produce certain toxic substances. this makes food unfit for consumption.