Unit 2 and 3 Review

1. A species is a population of organisms that can ______ and _____ under natural conditions.

• interact, survive
• interbreed, reproduce
• hunt, forage
• live, die

3. Endangered species are in immediate jeopardy of extinction, while threatened species are likely to become endangered.

• true
• false

4. A biome is an area of the planet that can be classified according to the ___ and ____ that live in it.

• people, animals
• plants, animals
• bacteria, plants
• trees, grasses

5. Which of these characteristics define a biome? Choose all that are correct.

• temperature
• soil
• amount of light
• amount of water

6. Gopher tortoises build burrows in sand that are known to be used by 300+ animal species, making them a great example of

• an indicator species
• a keystone species
• a pioneer species
• an endangered species

7. Which of the following are main types of biodiversity

• species biodiversity
• genetic biodiversity
• atmosphere biodiversity
• geosphere biodiversity
• ecological biodiversity

8. Which of the following are examples of secondary succession?

• Vegetation growing on newly formed volcanic rock.
• Seeds sprouting after a wildfire.
• Wetland plants growing in a flooded field.
• Lichens growing on a glacial moraine.

9. What does a biodiversity index tell scientist?

• how many species have gone extinct
• how species interact
• how many species exist in an area

10. Invasive species cannot dramatically affect an ecosystem's biodiversity.

• true
• false

11. A biome is cold, treeless and permanently frozen. Which biome is it?

• Tundra
• Taiga
• Alpine
• Chaparral