Question

An open-drain system is a breeding place for one of the following.

• A. Flies
• B. Mosquitoes
• C. Organisms which cause diseases
• D. All of these

Answer 1

The correct option is D

All of these

The correct option is D.
Explanation for the correct option:

1. An open drain is a waterway that is typically seen in metropolitan settings and is used to drain rainfall.
2. The channels frequently route the rainwater they collect toward rivers or other water sources.
3. Different types of flies, mosquitoes and other disease-carrying organisms thrive in open drain systems.
4. Closing the waste drainage system is necessary.
5. Most wastewater that is not sewage is collected in an open drain.
6. It is exceedingly unsanitary and dangerous to dispose of sanitary waste in open sewers.
7. To some extent, using open drains may be appropriate.
8. However, different disease-carrying pathogens thrive in any area with a body of water.
9. Even if the particles have been removed by the use of septic or interceptor tanks, using open drains is not a viable alternative to transport wastewater because humans can readily come into touch with it.
10. Fly and mosquito breeding grounds are in the open drainage system.
11. The development of disease-causing organisms is also aided by the open drainage system.

Final answer: An open-drain system is a breeding place for flies, mosquitoes, and organisms which cause disease.