Water Pollution - Free Printable

Problem: Solve the quiz and explain each answer.

#### Quiz Questions and Solutions:

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1. What do all living organisms need?

- Options:
- A. Food and water
- B. Oxygen
- C. Both A and B

Explanation:
All living organisms require both food and water to survive, as they provide energy and hydration. Additionally, most living organisms (except some anaerobic bacteria) also require oxygen for cellular respiration. Therefore, the correct answer includes both food, water, and oxygen.

Correct Answer:
C. Both A and B

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2. All are types of pollution EXCEPT:

- Options:
- A. Noise
- B. Food
- C. Light

Explanation:
Pollution refers to the introduction of harmful substances or energy into the environment. Noise and light are forms of pollution, but "food" is not typically considered a type of pollution. Instead, it is a necessity for life.

Correct Answer:
B. Food

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3. What percent of water on Earth is:

- Options:
- A. 70%
- B. 80%
- C. 90%

Explanation:
Approximately 70% of the Earth's surface is covered by water. This includes oceans, seas, lakes, rivers, and other water bodies.

Correct Answer:
A. 70%

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4. Why can humans not drink ocean water?

- Options:
- A. It is unavailable
- B. It contains salt
- C. It is too polluted

Explanation:
Ocean water cannot be consumed directly by humans because it contains high levels of salt, which can cause dehydration and health issues if ingested in large quantities. While pollution is an issue, the primary reason is the salt content.

Correct Answer:
B. It contains salt

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5. Rivers, streams, and lakes are:

- Options:
- A. Polluted water sources
- B. Salt water sources
- C. Freshwater sources

Explanation:
Rivers, streams, and lakes are generally classified as freshwater sources, as they contain low concentrations of salt compared to seawater. While some may be polluted, this does not define their primary classification.

Correct Answer:
C. Freshwater sources

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6. What are pollutants?

- Options:
- A. Particles and chemicals
- B. Types of salt
- C. Both A and B

Explanation:
Pollutants are substances that harm the environment or living organisms. They include particles (such as dust or soot) and chemicals (such as industrial waste or pesticides). Salt itself is not typically classified as a pollutant unless it is present in excessive amounts (e.g., from road salt runoff).

Correct Answer:
A. Particles and chemicals

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7. How many people each year become sick due to water pollution?

- Options:
- A. 250 million
- B. 14 billion
- C. 3 million

Explanation:
According to global health statistics, approximately 250 million people fall ill annually due to waterborne diseases caused by contaminated water sources.

Correct Answer:
A. 250 million

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8. How many people in the world do not have daily access to clean and safe water?

- Options:
- A. 1.2 trillion
- B. 1 billion
- C. 3 million

Explanation:
Globally, about 1 billion people lack access to clean and safe drinking water, primarily in developing countries.

Correct Answer:
B. 1 billion

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9. What is the meaning of infertile?

- Options:
- A. Unable to reproduce
- B. Single-celled living things
- C. Lack of clean water

Explanation:
The term "infertile" refers to the inability to reproduce. It is commonly used in the context of human fertility or agricultural land that cannot support plant growth.

Correct Answer:
A. Unable to reproduce

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10. Much of the water pollution in the world is caused by:

- Options:
- A. Animals
- B. Humans
- C. Natural causes

Explanation:
Water pollution is primarily caused by human activities such as industrial waste, sewage discharge, agricultural runoff, and improper disposal of chemicals. While natural processes can contribute to pollution, human activities are the main culprits.

Correct Answer:
B. Humans

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Final Answers:

1. C. Both A and B
2. B. Food
3. A. 70%
4. B. It contains salt
5. C. Freshwater sources
6. A. Particles and chemicals
7. A. 250 million
8. B. 1 billion
9. A. Unable to reproduce
10. B. Humans

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Boxed Final Answer:

\[
\boxed{
\begin{array}{ll}
1. & \text{C. Both A and B} \\
2. & \text{B. Food} \\
3. & \text{A. 70\%} \\
4. & \text{B. It contains salt} \\
5. & \text{C. Freshwater sources} \\
6. & \text{A. Particles and chemicals} \\
7. & \text{A. 250 million} \\
8. & \text{B. 1 billion} \\
9. & \text{A. Unable to reproduce} \\
10. & \text{B. Humans} \\
\end{array}
}
\]