Revision - Topic 7 - Water Pollution

We need to identify ways to reduce water because ............

1) aquatic animals and plants will be otherwise negatively affected

2) clean water is important to support life processes

3) people need clean drinking water

• 1 only

• 1 and 2 only

• 1, 2 and 3

• 2 and 3 only

Which of the following is not an effect of water pollution?

• LItter thrown into the sea traps birds and turtles, and causes the to drown.

• Oil from oil spills coats the feathers of birds and helps them to fly faster.

• Pesticides washed into rivers poison fish.

• Toxic waste released into water bodies kills aquatic animals and plants.

Refer to the map.

What pollutant(s) is/are likely to be found in the river at X?

• chemical fertiliser and human waste

• chemical fertiliser and industrial waste

• human waste

• industrial waste

Refer to the map.

Industrial waste is found at Y. Suggest the source of the industrial waste.

• city centre

• factories

• vegetable farm

• village

Refer to the map.

The sewage treatment plant treats waste from the city centre and factories. What could happen if the waste is not treated before being discharged into the sea?

• Both the fish and the aquatic plants in the sea will die.

• Only the aquatic plants in the sea will die.

• Only the fish in the sea will die.

• Only the vegetables on the farms will die.

Why is water important?

• Animals need water to stand upright

• Clean drinking water is needed for cooking

• Plants use water during photosynthesis to make food.

• Water in our blood helps to transport materials.

How is NEWater produced?

• Collecting rainwater.

• Imported from natural springs.

• Processed from seawater.

• Recycling used water.

How is drinking water obtained from seawater?

• add water to dilute the seawater until it is safe to drink

• chemicals are added to seawater to cover the saltiness

• infra-red radiation is used to treat the water

• remove the salt from seawater

Which is not a source of water pollution?

• fertilisers and pesticides

• litter

• oil spills

• treated sewage

How does an oil spill threaten the survival of aquaticc animals and plants?

• oil clogs the gills of fish

• oil forms a layer on the surface and prevents air from entering

• oil forms a layer on the surface and prevents light from entering

• oil forms a layer on the surface and prevents nutrients from entering