What is the scientific function of the wire mesh screen fitted on top of a VIP latrine vent pipe?
💡 UNEB Examiner Insight & Textbook Rationale
Flies in the dark pit fly toward the light at the top of the vent pipe, get trapped by the screen, and eventually die of starvation.
P.6 • Topic 11 Question 2 of 6
1 Mark • UNEB Standard
Why is the squat hole of a Ventilated Improved Pit (VIP) latrine left open without a lid at all times?
💡 UNEB Examiner Insight & Textbook Rationale
Leaving the squat hole open enables continuous convection currents: cool fresh air is pulled down the hole, driving warm foul air up through the vent pipe.
P.6 • Topic 11 Question 3 of 6
1 Mark • UNEB Standard
How does the Ecosan latrine benefit local crop farmers?
💡 UNEB Examiner Insight & Textbook Rationale
The Ecosan latrine uses ash or lime to dehydrate human waste and destroy bacteria, turning it into rich organic fertilizer for gardens.
P.6 • Topic 11 Question 4 of 6
1 Mark • UNEB Standard
What is the function of the U-trap pipe in a water closet (flush toilet)?
💡 UNEB Examiner Insight & Textbook Rationale
The U-trap permanently holds a water seal that prevents foul smells and methane sewer gases from rising back into the toilet room.
P.6 • Topic 11 Question 5 of 6
1 Mark • UNEB Standard
Which species of mosquito breeds in clean, stagnant water and transmits malaria?
💡 UNEB Examiner Insight & Textbook Rationale
The female Anopheles mosquito breeds in clean, stagnant pools and transmits the Plasmodium parasite causing malaria.
P.6 • Topic 11 Question 6 of 6
1 Mark • UNEB Standard
Why should chemical insecticides NEVER be poured into an ordinary pit latrine?
💡 UNEB Examiner Insight & Textbook Rationale
Putrefying bacteria decompose human feces naturally. Killing them with insecticides stops digestion, causing the pit to fill up rapidly.
🏆
Quiz Completed!
Here is your official evaluation based on UNEB assessment guidelines:
0 / 6
Division 1 (Distinction)
0
Correct Answers
0
Incorrect Answers
0%
Overall Accuracy
Outstanding achievement! You demonstrate full mastery of this curriculum material.