Ecosystems and Environmental Awareness Quiz

Which of the following is an **abiotic factor** in an ecosystem?

• Grass

• Fish

• Soil

• Birds

Which of the following is an example of a **biotic factor** in an ecosystem?

• Sunlight

• Water

• A tree

• Temperature

What is the name of the layer in the atmosphere that protects us from the Sun's harmful rays?

• Troposphere

• Ozone layer

• Biosphere

• Hydrosphere

Which of the following gases is a **greenhouse gas**?

• Oxygen

• Nitrogen

• Carbon dioxide

• Hydrogen

Which of the following is an example of a **natural ecosystem**?

• A fish tank

• A garden

• A forest

• A crop field

A student is studying a pond. She lists sunlight, water, frogs, algae, and rocks. Which group correctly separates the **biotic** factors from the **abiotic** factors?

• Biotic: sunlight, water; Abiotic: frogs, algae, rocks

• Biotic: frogs, algae; Abiotic: sunlight, water, rocks

• Biotic: rocks, water; Abiotic: frogs, algae, sunlight

• Biotic: sunlight, frogs; Abiotic: algae, water, rocks

A farmer builds a pond and fills it with fish and water plants. How is this ecosystem **different** from a natural pond ecosystem?

• A natural pond has water but a farmer's pond does not

• The farmer's pond is an artificial ecosystem created and managed by humans

• A natural pond has no living things in it

• The farmer's pond has more sunlight than a natural pond

When factories and cars release smoke into the air, it causes **air pollution**. Which of the following best describes how air pollution affects living things?

• It makes the air cleaner and easier to breathe

• It helps plants grow faster

• It can cause breathing problems in humans and animals

• It increases the amount of oxygen in the air

Scientists have noticed that the ozone layer is getting thinner over time. Using what you know about the ozone layer, **explain** what could happen to life on Earth if the ozone layer continues to deplete.

• Plants and animals would receive less sunlight, making Earth colder

• More harmful ultraviolet rays from the Sun would reach Earth, harming living things

• The air would become cleaner because fewer gases would be trapped

• Rainfall would increase because clouds would form more easily

Riya notices that her city has been getting hotter every year. She reads that greenhouse gases trap heat in the atmosphere, causing **global warming**. She also sees that there are many factories and cars in her city. Using this information, what is the **most likely reason** her city is getting hotter, and what is one thing people could do to help solve this problem?

• The city is getting hotter because of more rainfall; people should build more factories

• The city is getting hotter because greenhouse gases from factories and cars are trapping heat; people could use less fuel by walking or using bicycles

• The city is getting hotter because the ozone layer is getting thicker; people should use more air conditioners

• The city is getting hotter because there is too much oxygen; people should cut down more trees