What happens when dissolved oxygen levels drop too low?

Fish and other aquatic life can die

How might a factory dumping warm water into a river affect the ecosystem?

It could lower dissolved oxygen and harm fish

It would help plants grow faster

It would make the water more acidic

If a scientist finds only pollution-tolerant organisms in a river, what does that indicate?

There is no turbidity in the water

Why might a sudden increase in algae in a lake be a cause for concern?

It can lead to eutrophication and decrease oxygen levels

It means the water is becoming healthier

It will increase the number of fish

How can human activity negatively impact water quality?

By introducing pollutants like fertilizers and chemicals

By increasing dissolved oxygen levels

By reducing nitrates in the water

Design an investigation to test how pH levels affect aquatic plant growth. What would be an important factor to measure?

The growth rate of aquatic plants under different pH levels

The amount of sunlight in the area

The number of fish in the water

The number of birds near the water

A city experiences high levels of nitrates in its water supply. What steps could officials take to improve water quality?

Reduce agricultural runoff and treat wastewater

Add more phosphates to balance the water

If an area with a lake sees a sharp drop in bioindicator diversity, what might be the cause?

A pollution event has affected water quality

How could climate change impact dissolved oxygen levels in oceans and lakes?

By increasing water temperature and lowering oxygen levels

What is point source pollution?

Pollution spread over a large area

Pollution from a single, identifiable source

Pollution caused by natural events

Pollution that only affects oceans

What is an example of non-point source pollution?

Runoff carrying pesticides from multiple farms

A factory dumping waste into a river

A sewage plant leaking into a lake

Why are spills harmful to water quality?

They contaminate large areas of water

They increase dissolved oxygen levels

How do fertilizers contribute to water pollution?

They cause eutrophication by adding excess nutrients

They remove bacteria from water

Why is industrial waste a concern for water pollution?

It may introduce toxic chemicals into water sources

It increases the water's temperature, making it cleaner

It only affects small areas of water.

How does sewage pollution impact water quality?

It increases the number of bioindicators

What factor would most likely indicate water pollution?

High levels of nitrates and phosphates

How might scientists determine if a river is affected by non-point source pollution?

They would measure pollution levels at multiple locations

They would look for a single factory dumping waste

They would check if only one species of fish is present

They would test water in the ocean instead.

Why might a city's water supply test show high nitrate levels?

Runoff from farms and streets introduced excess fertilizers

Industrial waste was dumped directly into the river

The city added more oxygen to the water

Oil spills reduced pollution in the water

If a lake suddenly has a lot of algae, what should scientists test for?

High levels of nitrates and phosphates

A decrease in water temperature

What could happen if water turbidity is too high?

Bioindicators become more diverse

How would you design an experiment to test the impact of industrial waste on water quality?

Compare water samples from a polluted river and a clean river

Measure only the temperature of the water

Add fertilizers to the water and see how fish react

Remove bioindicators and check for changes

If a community wants to reduce non-point source pollution, what is the best strategy?

Reduce the use of fertilizers and improve runoff management

Allow oil spills to dilute naturally

How could you use bioindicators to monitor water pollution over time?

Measure changes in the types and numbers of organisms present

Remove all bioindicators and see if the water improves

Add new species to the water and observe the results

Increase nitrate levels and track changes

Why is clean water important for humans?

It prevents illness and is needed for drinking and cooking

What is one way polluted water harms the environment?

It kills fish and reduces wildlife populations

It increases oxygen levels in water

It makes water safer for swimming

What is the purpose of a water treatment plant?

To remove bacteria, chemicals, and dirt

To add more chemicals to the water

How does planting trees help protect water quality?

Trees filter pollutants before they reach water sources

Trees release oxygen into water

Trees remove fish from polluted water

Trees make the air cleaner but do not affect water

Why should fertilizers be used carefully near water sources?

Excess fertilizers can wash into rivers and cause pollution

Fertilizers make water look clearer

Fertilizers increase oxygen in water

What is one action individuals can take to reduce water pollution?

Pick up pet waste to prevent bacteria from entering storm drains

Use more fertilizers to help plants grow

Ignore pollution because it does not affect them

How does reducing litter help keep water clean?

It prevents trash from entering waterways

It increases the amount of nutrients in water

It helps fish produce more oxygen

It makes water treatment unnecessary

What might happen if harmful substances enter drains?

They can pollute rivers and lakes

They will be naturally removed by the pipes

They will improve water quality

They will disappear on their own

How do safety standards help protect water quality?

They ensure water is treated and safe for drinking

They allow pollution in certain areas

They make water treatment plants unnecessary

They increase fertilizer use near rivers

A scientist finds that fish are dying in a lake. What factor should be investigated first?

The amount of dissolved oxygen in the water

The number of boats on the lake

The presence of birds near the water

Why might a river cleanup project be important for water quality?

It helps remove trash and pollutants from the water

It increases the number of chemicals in the water

It reduces the amount of fish in the river

If a city wants to protect its water supply, what is the best action to take?

Improve waste disposal and reduce pollution

Dump wastewater into local rivers

How could a student design an experiment to test how trees affect water quality?

Measure pollution levels in water near areas with and without trees

Cut down trees and observe changes in water

Add chemicals to the water and record the results

Test how much water trees absorb in a dry area

If a community experiences water pollution from nearby farms, what is the best long-term solution?

Educate farmers about reducing fertilizer use and runoff

Encourage more factories near water sources

A scientist finds high bacteria levels in a river. What should they investigate?

Possible sources of sewage or waste pollution

The amount of sunlight reaching the water

The speed of the river's current

How can a local government encourage citizens to help protect water quality?

Organize educational programs and community cleanup events

Require everyone to buy bottled water

Eliminate water treatment plants

Allow people to dump trash in rivers

What is the main purpose of a water treatment plant?

To remove dirt, bacteria, and harmful chemicals

To add chemicals to water to make it taste better

What happens during the sedimentation step of water treatment?

Floc settles to the bottom for removal

Bacteria are killed using UV light

Water is filtered through sand and gravel

ESS.8.3 Water Quality

Quiz

•

Science

•

8th Grade

•

Practice Problem

•

Medium

•

NGSS

MS-LS2-4, MS-LS2-1, MS-LS2-5

+11

Standards-aligned

Georganna MillbrookHS

Used 13+ times

FREE Resource

66 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is water quality?

The amount of salt in the water

How clean and safe water is

The number of fish in a river

How deep a lake is

Tags

NGSS.MS-LS2-1

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is potable water?

Water that is safe to drink

Water found in the ocean

Water with high turbidity

Water with no dissolved oxygen

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which factor directly affects the amount of oxygen in water?

Turbidity

Temperature

pH

Nitrates

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What happens when water has high turbidity?

The water becomes more acidic

Sunlight is blocked, harming aquatic plants

More dissolved oxygen is available

Fish populations increase

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

NGSS.MS-LS2-4

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why is water quality important for humans?

It affects drinking water, cooking, and farming

It makes lakes look prettier

It keeps rocks from dissolving

It reduces the need for water conservation

Tags

NGSS.MS-ESS3-4

NGSS.MS-LS2-1

NGSS.MS-LS2-4

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How do nitrates and phosphates affect aquatic life?

They help fish grow faster

They cause eutrophication, reducing oxygen levels

They make water colder

They decrease water turbidity

Tags

NGSS.MS-LS2-4

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How can bioindicators help scientists assess water quality?

They clean polluted water

Their presence or absence shows water pollution levels

They measure the pH of water

They add oxygen to the water

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