7. List two examples of a protozoan that is harmful to humans or the envi-ronment. Describe their danger.

One example is Plasmodium, which causes malaria. Malaria is a life-threatening disease that affects millions of people worldwide, particularly in tropical and subtropical regions. It is transmitted through the bites of infected mosquitoes and causes symptoms such as fever, chills, and flu-like illness. If left untreated, it can result in severe complications and even death.

Another example is Giardia lamblia, which is a waterborne parasite that can cause giardiasis. Giardiasis is a diarrheal illness that can cause severe abdominal pain, bloating, and dehydration. It is transmitted through the ingestion of contaminated water or food, and can be particularly dangerous for young children, elderly people, and individuals with weakened immune systems.

Did you know?

Did you know that there are certain protozoans that can pose serious harm to humans and the environment? Two examples of these harmful protozoans are Giardia lamblia and Plasmodium falciparum. Giardia lamblia is a protozoan that causes a disease called giardiasis. It often contaminates water sources, leading to widespread infections. When ingested, the protozoan attaches itself to the lining of the small intestine, causing symptoms such as diarrhea, abdominal pain, and weight loss. Giardiasis is a significant health concern, particularly in developing countries with poor sanitation and unsafe drinking water. Plasmodium falciparum is another dangerous protozoan species responsible for causing malaria, a life-threatening disease. Transmitted through the bite of infected female Anopheles mosquitoes, Plasmodium falciparum invades red blood cells, leading to cycles of fever, chills, anemia, and organ damage. Malaria affects millions of people worldwide, predominantly in tropical and subtropical regions, and can be fatal if left untreated. Understanding the dangers presented by protozoans like Giardia lamblia and Plasmodium falciparum is crucial to implementing appropriate preventive measures, improving sanitation systems, and developing effective treatments to combat these harmful organisms.