Question

Droplet method of transmission of disease is seen in
A. AIDS
B. Syphilis
C. Hepatitis
D. Common cold

Answer 1

Hint:- A disease can be defined as an abnormal condition that has negative effects on an organism's structure and function. The diseases that can be transmitted from one person to another are called contagious diseases. The diseases that cannot be transmitted from one person to another are called non-contagious or non-transmittable diseases.

Complete answer:-
The diseases are caused by organisms such as bacterias, viruses, fungi and parasites. The organisms live inside or on the surface of the host body. In some cases, they are harmless but in some cases, they can cause harm to the host. The harmful organism is referred to as the parasite and the body in which it lives is called the host. The disease can be transmitted from one person to another through carrier agents. They are classified as abiotic and biotic transmitters. Abiotic transmitters include air and water. Biotic transmitters include vectors. Vectors are organisms such as houseflies, mosquitoes and worms that have the ability to transmit the disease-causing organisms from one person to the other.
AIDS- Acquired Immune Deficiency Syndrome. The causal organism is Human Immunodeficiency virus (HIV). It mainly damages the immune system. It can be transmitted from one person to another through sexual intercourse with an infected person, usage of the same syringe by a healthy and infected person. There is also the possibility of transmission through the blood transfusion of the infected person.
Syphilis- It is a contagious disease that is transmitted through sexual contact. It starts as sores on the genitals, rectum or mouth. Later, it spreads from person to person through the skin or mucous membrane that is in contact with the sore. It is caused by Treponema pallidum.
Hepatitis- It mainly affects the liver causing its inflammation. It is mainly caused by the virus. The common symptoms include fatigue, nausea, vomiting and abdominal discomfort. The disease can mainly be transmitted from one person to another through the faecal-oral route.
Common cold- It is mainly caused by a virus that infects the nose and throat of the person. It is caused by rhinovirus. It is transmitted from one person to another through water droplets. Common symptoms include running nose and sore throat.
The droplet method of transmission of the disease is seen in the common cold.

The correct answer is option D.

Note:- Some of the diseases that can be transmitted through water droplets include H1N1 and Covid–19. When an infected person sneezes, the water droplets will enter the nostril of the other person who is standing next to him and then leads to the spread of the disease.