Question

Which of the following are called pathogens?
A.Virus, Bacteria, Fungi, and Protozoans
B.Measles, Mumps, and chickenpox
C.Cholesterol, Saturated fat, and Helminths
D.Cholera, Typhoid, Tuberculosis, and Measles

Answer 1

Hint: Pathogens are a class of organisms that are known as disease-causing agents. They are known to cause diseases in animals, plants, and also human beings. They are known to cause a variety of diseases in various life forms.

Complete step by step answer:Option -A- Virus, Bacteria, Fungi and Protozoans
These types are known as pathogens. These all are microscopic organisms or particles which on invading their susceptible host cause different diseases in them.
Viruses are small particles that require a host to replicate and contain RNA or DNA. The most pathogenic family of the virus is Retroviridae causing HIV.
Bacteria are small microbes causing a huge variety of diseases one of the most important being Tuberculosis caused by Mycobacterium.
Fungi are eukaryotic organisms that may cause diseases. Important including Candida species causing problems of hair, nails, and skin.
Protozoans are eukaryotes that are single-celled causing diseases such as malaria, Chagas disease, etc.
Option -B- Measles, Mumps, and chickenpox
These do not represent the class of any pathogen but actually, these are some of the concerned diseases which are caused by different pathogens. These all are viral diseases caused by different species of virus.
Option -C- Cholesterol, Saturated fat, and Helminths
These do not represent any pathogenic organism either. Cholesterol and saturated fats are a class of macromolecules called fats. Helminths are parasites causing problems in animals including nematodes, trematodes, and cestodes.
Option -D- Cholera, Typhoid, Tuberculosis, and Measles
This option does not represent pathogens, these are the diseases caused by various pathogens. Caused by bacteria and viruses. So this option is not correct.
So, the correct answer to this question is the option"A".

Note: Pathogens are found living in various habitats the most common and potential site for pathogens is known to be soil. In soil as many potent diseases causing pathogens to enter the animal or any living form.