Biomes Ecosystems 4th-5th

What percentage of Earth's surface is covered by forests?

• 25%

• 70%

• 50%

• 30%

Which biome is characterized by a large, flat, treeless area?

• Forest

• Grassland

• Tundra

• Desert

What is the primary difference between a biome and an ecosystem?

• Biomes can exist without ecosystems.

• Biomes contain only living components, while ecosystems include nonliving components.

• Ecosystems are parts of a biome.

• Ecosystems are larger than biomes.

Which cycle involves the movement of water between the Earth's surface and the air?

• Water cycle

• Oxygen cycle

• Nitrogen cycle

• Carbon cycle

What happens to carbon in the carbon cycle?

• Plants take it in to make sugars.

• It is converted into nitrogen.

• It is used to produce oxygen.

• It is only taken in by animals.