Sign up for FREE

CFU on 6.LS2.1, 6.LS2.5, and 6.LS2.6

Last updated about 3 years ago

10 questions

1

1

1

1

1

1

1

1

1

1

Question 1

1.

This graph shows the carrying capacity for a population of grass eating animals on the Great Plains of the United States.

Which explanation below is the best reason why the carrying capacity dropped during years 4 to 7?

The animals began to migrate to another area in year.

The animals began to have fewer offspring between years 3 and 4.

A group of non-grass eating animals moved into this area beginning in year 3.

The area began to experience drought conditions in year 4.

Question 2

2.

A population of small fish and a population of small squids eat the same type of krill in the same ecosystem. Krill is the main source of food for both fish and squid. If the squid grows faster than the fish population, what will most likely happen to the fish population?

The fish population will start to eat more krill than the squids.

The fish population will get smaller or even die out.

The fish population will start to grow faster.

The fish population will stay the same size.

Question 3

3.

The graph below shows the populations, over several years, for two animals that share a habitat. Foxes are mammals that hunt for food, and grouse are birds, a common prey animal of foxes. According to the data, in which year did the population of foxes show a decrease that is most likely the result of a decrease in the availability of a source of food?

2003

2005

2008

2012

Question 4

4.

An example of a predator and a prey species for four separate ecosystems is provided below. Which of the following would demonstrate an appropriate prediction for the changes to one of the populations of organisms due to a predator/prey interaction?

When the population of sharks decreases because of fishing, the population of small fish will decrease.

After a period of heavy rainfall and warmer temperatures, the population of mosquitoes will increase.

During hunting season, when many deer are killed by hunters, the mountain lion population will decline.

When abundant resources allow the population of mice to increase, the population of snakes will decrease.

Question 5

5.

Which of the following is an example of a threat of invasive species to a native species?

The invasive species could out-compete the native species for resources.

The invasive species could release pheromones that the native species wouldn't like.

The invasive species do not pose a threat to native species.

The invasive species could make a sound that the native species is opposed to.

Question 6

6.

Which of the following is NOT a way to limit the spread of invasive species?

Always clean your boat, gear, tires, and shoes before leaving a location

Only plant native plants in your garden

Learn how to identify invasive species and report them to local wildlife control

Take firewood with you when you go camping so you don't have to buy any at the campsite

Question 7

7.

Why do the populations of invasive species grow so quickly?

Invasive species are native to an area.

Invasive species are prey to many animals.

Invasive species keep the ecosystems in equilibrium.

Invasive species have no natural predators in their new environment.

Question 8

8.

A farmer stops cultivating a large tract of farmland and abandons it. The natural changes taking place soon afterwards, such as the growth of wild grasses and weeds, can be considered secondary succession because

a new ecosystem develops.

there is already soil present.

the land is not controlled by humans.

wild grasses and weeds make soil from rocks.

Question 9

9.

How do pioneer species make ecological succession possible on an island following a volcanic eruption?

They establish homes in which animals can live.

They break down rock into soil in which plants can grow.

They adjust the climate by altering the average temperature in a region.

They become the main species in the area replacing existing species  in the area.

Question 10

10.

Key deer are found on the islands of the Florida Keys and feed on the native trees. Which is most likely to happen to populations of Key deer if the forests are cleared where they live?

Their populations will increase because of an increase in open space.

Their populations will decrease because of a decrease in usable habitat.

Their populations will move to the mainland and disappear from the island.

Their populations will adapt to the new habitat and they will become a new species.