Sec 2 WB 9.2 Sample Answer

Qn 1b)
Untreated sewage produced by households
Untreated sewage produced by industries
Oil from oil tanker accidents/oil spill from vessels
Rubbish thrown directly into a water bodies

Qn 1c)
When untreated sewage is released into rivers/lakes, these water bodies become polluted because sewage contains human waste, detergents and chemicals which can be harmful if consumed.
Sewage that is treated may still contain non-biodegradable substances such as detergents. These substances remain in the water and cause water pollution.

Qn 2a)
A: People may use polluted water from the river or other water bodies for cooking and drinking.
B: People may consume contaminated seafood which comes from a polluted river or the sea.
C: People may come into contact with polluted water when they bathe or swim in a polluted river or the sea.

Qn 2b)
When we consume contaminated seafood from polluted water, the poisons that accumulate in the bodies of fish and shellfish are passed on to us. This may make us ill.
When we drink contaminated water, we may suffer from diseases such as cholera and typhoid.

Qn 2c)
The oil prevents oxygen from reaching fish in the sea, thus killing them. This will reduce the supply of fresh fish, hence affecting the fishing industry negatively.

*This is only a sample from the publisher. Some of your schoolmates were able to give me really good answers/explanation. I will be removing the answers just before the March holidays. PLEASE do your corrections before I collect your files for checking.