Question 7:
Diagram 7.1 shows the condition of a river that is the source of water for a village.
(a) State one source of water pollution. [1 mark]
(b) Diagram 7.2 shows the conversation between Imran and the chief of the village.
Explain one method of Green Technology that can be used to treat the source of water.
Method: …………………..
Explanation: ……………………
[2 marks]
(c) Imran and his friends carry out a test to investigate the level of water pollution. Table 2 shows the results of the test.
(i) Based on Table 2, explain which area is the most contaminated. [2 marks]
(ii) Imran and his friends repeated the test at the area for 3 months consecutively. They found out that the results are quite the same.
Give the importance of the action.
[1 mark]
Answer:
(a) Wastewater/Solid waste/Industrial waste
(b)
Method: Effective Microorganism Mud Balls(EM)
Explanation:
– Stunt the bacterial growth
– Treating dirty/rotten water
– Lowers the pH value
(c)(i)
– Area R
– This is because the time taken for the colour of the methylene blue solution to decolourise was the shortest.
(c)(ii) To get more accurate result
Diagram 7.1 shows the condition of a river that is the source of water for a village.
(a) State one source of water pollution. [1 mark](b) Diagram 7.2 shows the conversation between Imran and the chief of the village.
Explain one method of Green Technology that can be used to treat the source of water.
Method: …………………..
Explanation: ……………………
[2 marks]
(c) Imran and his friends carry out a test to investigate the level of water pollution. Table 2 shows the results of the test.
(i) Based on Table 2, explain which area is the most contaminated. [2 marks](ii) Imran and his friends repeated the test at the area for 3 months consecutively. They found out that the results are quite the same.
Give the importance of the action.
[1 mark]
Answer:
(a) Wastewater/Solid waste/Industrial waste
(b)
Method: Effective Microorganism Mud Balls(EM)
Explanation:
– Stunt the bacterial growth
– Treating dirty/rotten water
– Lowers the pH value
(c)(i)
– Area R
– This is because the time taken for the colour of the methylene blue solution to decolourise was the shortest.
(c)(ii) To get more accurate result