1º Biology - 1.6 Pollution of water

What is the purpose of decanting sludge in water purification?

• To remove oils and fats
• To remove sand and mud
• To remove plastics and wipes
• To remove bacteria

What is the purpose of biological treatment in water purification?

• To remove oils and fats
• To remove sand and mud
• To remove bacteria
• To remove plastics and wipes

What is virtual water?

• Water that is used for virtual meetings
• Water that is used to manufacture products
• Water that is used for virtual reality experiences
• Water that is not real

What is the purpose of decanting bacterial sludge in water purification?

• To make the water drinkable
• To distribute the water to parks and gardens
• To remove bacteria from the water
• To return the water to rivers or the ocean

What type of chemicals are found in industrial pollutants?

• Organic chemicals
• Inorganic chemicals
• Both organic and inorganic chemicals
• None of the above

What is the first step in water purification?

• Filtration
• Decanting bacterial sludge
• Decanting sludge
• Biological treatment

What is the recommended daily water consumption according to WHO?

• 300 litres
• 200 litres
• 100 litres
• 50 litres

What substances from agriculture and livestock can pollute aquifers?

• Nutrients from manure
• Pesticides
• Industrial fertilisers
• All of the above

What is the difference between water purification and drinking water production?

• Drinking water production involves decanting sludge
• Water purification involves biological treatment
• Drinking water production involves disinfection and storage
• Water purification involves filtration and decantation

What impact does organic matter have on water pollution?

• It causes bacteria to proliferate
• It decreases oxygen levels in water
• It destroys other life forms in rivers and lakes
• All of the above