Which of the following options serves all the three objectives mentioned below? I: To promote human health II: To provide a cleaner environment III: To break the cycle of diseases
- AScavenging system
- BDistribution system
- CDrainage system
- DSanitary systemCorrect
Solution
Concept
A sanitary system collects, carries and safely disposes of human waste and wastewater to protect health and the environment.
Step-by-step solution
1. Read the three objectives: promote human health, give a cleaner environment, break the cycle of diseases. 2. A scavenging system only removes night soil by hand. It is unhygienic and does not meet all three aims. 3. A distribution system supplies water. It does not remove waste. 4. A drainage system mainly removes storm water. 5. A sanitary system collects and safely disposes of wastes, so it meets all three aims. Answer is D.
Explanation
A sanitary system removes human waste and sewage safely and quickly. This keeps people healthy, keeps the surroundings clean and stops the spread of diseases. So it serves all three objectives.
Why the other options are wrong
A: Scavenging is manual removal of night soil and is itself a health risk. B: Distribution system supplies water and does not deal with waste. C: Drainage system mainly carries storm water and does not fully break the disease cycle.
Shortcut
Health + clean environment + disease control = Sanitation.
Common mistake
Choosing drainage system because it also removes water. But drainage is mainly for storm water, not complete sanitation.
Correct answer: D) Sanitary system