Water pollution

Which of the following is an example of the importance of water?

• For photosynthesis in plants

• to transport substances in our circulatory system

• raw material for industries

Name one of the four national taps of Singapore.

NEWater is mainly used for

• photosynthesis

• industrial purposes

• medical purpose

• cooking

In desalination, __________ is removed from seawater.

• sugar

• sand

• salt

Which of the following is a common source of water pollution near factories?

• untreated sewage and industrial waste

• litter

• oil spills

• pesticides and fertilisers

Which substance can coat the feathers of birds and prevent them from flying?

• oil

• litter

• pesticides

• sewage

Which of the following can trap aquatic animals?

• oil

• litter

• pesticides

• sewage

Which of the following can cause algae to grow rapidly on the surface of water?

• oil

• litter

• pesticides

• fertilisers

Which of the following restricts the amount of sunlight entering the water and prevents aquatic plants from carrying out photosynthesis?

• oil

• litter

• pesticides

• fertilisers

Which of the following is not a way to reduce water pollution?

• throwing litter into rubbish bins

• throwing litter into waterways

• educating the public on the importance of keeping the waterways clean

• enforce laws to prevent the public from littering