Microorganisms can enter our body through various mediums, including contaminated water, food, air, direct contact with infected individuals, vectors such as mosquitoes or ticks, and contact with contaminated surfaces or objects.
(7) Must we use the handkerchief used by a person suffering from cold and fever or not? Explain with reasons.
No, we should not use the handkerchief used by a person suffering from cold and fever because it may contain infectious microorganisms like viruses or bacteria that can be transmitted to others and cause illness.
(8) What happens, when our body looses its resistance power?
When our body loses its resistance power, it becomes more susceptible to infections and illnesses caused by microorganisms. This can lead to increased frequency and severity of infections, prolonged recovery times, and overall compromised health.
(9) Why is cleanliness necessary for being healthy?
Cleanliness is necessary for being healthy because it helps prevent the spread of harmful microorganisms that can cause diseases and infections. Maintaining personal hygiene, clean surroundings, and proper sanitation practices reduce the risk of microbial contamination and promote overall health and well-being.
(10) What will happen if a small amount of curd is added to milk to prepare curd and then heated.
If a small amount of curd is added to milk to prepare curd and then heated, the heat will kill the live bacterial cultures present in the curd starter, preventing the milk from fermenting and turning into curd effectively.
(11) Why do the doctors advice us to drink boiled water ?
Doctors advise drinking boiled water to ensure its safety by killing or inactivating harmful microorganisms, such as bacteria, viruses, and parasites, that may be present in untreated water. Boiling water is an effective method of water purification that reduces the risk of waterborne diseases.
Important Points
Microorganisms, which cannot be seen by the naked eye, are typically smaller than 100 microns.
Antoni van Leeuwenhoek was the first person to observe microorganisms, including bacteria, through microscopes he made himself.
The germs causing malaria are protozoa of the genus Plasmodium.
Mushroom belongs to the kingdom Fungi.
HIV/AIDS is caused by the human immunodeficiency virus (HIV), which is a type of virus.
