Biodiversity Unit Test
2 of 132 of 13 Items
Question
Based on the data below, which group of animals are genetically diverse?
# of different type of species in the world
Birds 9,000+
Bears 8
Horses 350+
Whales 90
(1 point)
Responses
whales
horses
birds
bears
birds
Which biome best supports animals that feed mostly by grazing on grasses and small shrubs?(1 point)
Responses
tropics
tropics
mixed forests
mixed forests
polar desert
polar desert
savanna
savanna
Which describes a primary role of the pioneer species in an ecosystem?(1 point)
Responses
protect other species from danger
protect other species from danger
prevent fertile soil from washing away
prevent fertile soil from washing away
provide food for small animals
provide food for small animals
break down rock into soil
break down rock into soil
What happens after coral is bleached?(1 point)
Responses
The coral is susceptible to starvation.
The coral is susceptible to starvation.
The coral produces peroxides.
The coral produces peroxides.
The coral dies immediately.
The coral dies immediately.
The coral releases algae into the ocean.
The coral is susceptible to starvation.
The most biodiverse ecosystem in the world is likely a(1 point)
Responses
taiga.
taiga.
coral reef.
coral reef.
cold desert.
cold desert.
tundra.
coral reef.
Biodiversity Unit Test
7 of 137 of 13 Items
Question
Marine biologist Dr. James Estes researched sea otters and their habitats in the Aleutian Islands of the North Pacific Ocean. Sea otters feed on animals such as crabs and urchins. Islands with sea otters contained a lot of kelp, a seaweed that is an important food source for fish and other sea animals. However, Islands without otters had large populations of urchins but no kelp since sea urchins feed on this seaweed. Since sea otters are able to control the population of urchins, this allows for kelp to freely grow in those areas. Given this information, what term best describes the otter in the Aleutian Islands ecosystem?(1 point)
Responses
decomposer
decomposer
apex predator
apex predator
producer
producer
keystone species