Biology
Describe the ways in which communicable diseases are transmitted through various indirect methods.
Answer
Indirect method of transmission of communicable disease are:
- From items used by the infected person — Touching and sharing items like towels, handkerchiefs, combs, utensils, etc. of an infected person may spread the disease to a healthy person.
- Contaminated food and water — Houseflies carry germs from garbage and sewage and deposit them on food. Contamination of drinking water even with little amount of faeces or dung can cause a number of diseases.
- Droplets through air — The droplets coming out when a person infected with common cold, TB, etc. sneezes or coughs, transmit the disease causing germs through the air spreading the disease to more people.
- Vectors or carriers — Houseflies, mosquitoes, rodents, etc. also carry disease causing germs.
Related Questions
Public hygiene is equally important as personal hygiene. Give reasons.
Given below is a crossword puzzle. Read the clues across and clues down, and fill up the blank squares. Check your performance with the correct solutions given at the end of the chapter.
Clues down
1. Germs or germ - substances introduced into the body to prevent occurrence of an infectious disease.
2. A disease caused by an infected dog that affects the central nervous system.
3. A disease in which the eyes, the skin and the urine turn yellow.
4. The disease pertussis is popularly known as whooping ……………
Clues across
1. Category of pathogen that causes diseases like common cold and mumps.
5. This is the vaccine for preventing tuberculosis.
6. An organ usually affected by tuberculosis.
7. Jumbled spelling of one of the most common insect which visits our exposed foods and contaminates them.
8. Cover this part of your body by a handkerchief while sneezing to prevent droplet infection to others.
9. These may readily grow in your hair, if you do not wash it regularly.
10. A disease that weakens body's defence system against infections.
List 3 ways by which you should keep your environment clean.
Distinguish between Elephantiasis and Malaria on the basis of the mode of transmission.