CFU on 6.LS2.1 Impact of Environmental Variables and 6.LS2.6 Change Over Time (6/19/2024)

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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.

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.

Below is an energy pyramid model for an ecosystem. If an ecosystem is in equilibrium, the
population of each organism will not change much from year to year. However, in this
ecosystem the rabbits became infected with a disease. Which graph shows the effect on the
organisms in the ecosystem?

An environmental change drastically reduced the population of milkweed plants in an area. The milkweed plants provided the only source of food for a nearby population of monarch butterfly caterpillars. Which statement describes the most likely effect of this environmental change on this population of monarch butterflies?

The number of monarch butterflies will decrease because they did not have enough food
as caterpillars.

The number of monarch butterflies will stay the same because butterflies reproduce so
rapidly their populations can withstand most food shortage.

The number of monarch butterflies will stay the same because their caterpillars will begin
consuming nectar from different types of flowers.

The number of monarch butterflies will increase because their reproduction rate will
increase to ensure some individuals survive.

If the Razor Clam population decreased due to an oil spill, which populations in the food web
would decrease because they are DIRECTLY affected by the clam? Choose TWO answers.

The graphs below show the decrease of tree populations in two different locations. Each
picture of a tree represents 10,000 trees in the forest.

Location A is consistently receiving less rain each year, and location B experienced a
forest fire.

Location A is experiencing the increase in insects feeding on the native trees, and location
B experienced a drought from year 1 to year 3.

Location A experienced a forest fire and location B experienced logging.

Location A is undergoing a drought and location B is experiencing a decrease in insects
feeding on the native trees.

In Community 1, the majority of individuals come from just one of the species. In Community 2, the individuals are spread more evenly across different species. Which community would you consider to be a resilient ecosystem and why...

Community 1 because it is more likely to recover from or adjust easily to change.

Community 1 because it has less biodiversity due to invasive species.

Community 2 because it has been impacted by a natural disaster such as a flood.

Community 2 because there is a better balance of species.

Analyze and interpret the graph.
This ecosystem was in equilibrium until year 3. Determine the most likely reason this
ecosystem began changing over time.

Disease infected the deer.

Logging started in this area.

Pesticides were sprayed to control the mushroom population.

The bear population decreased.

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.

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.

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.

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.

Below is an energy pyramid model for an ecosystem. If an ecosystem is in equilibrium, the
population of each organism will not change much from year to year. However, in this
ecosystem the rabbits became infected with a disease. Which graph shows the effect on the
organisms in the ecosystem? 

An environmental change drastically reduced the population of milkweed plants in an area. The milkweed plants provided the only source of food for a nearby population of monarch butterfly caterpillars. Which statement describes the most likely effect of this environmental change on this population of monarch butterflies?

The number of monarch butterflies will decrease because they did not have enough food
as caterpillars.

The number of monarch butterflies will stay the same because butterflies reproduce so
rapidly their populations can withstand most food shortage.

The number of monarch butterflies will stay the same because their caterpillars will begin
consuming nectar from different types of flowers.

The number of monarch butterflies will increase because their reproduction rate will
increase to ensure some individuals survive.

If the Razor Clam population decreased due to an oil spill, which populations in the food web
would decrease because they are DIRECTLY affected by the clam? Choose TWO answers.

Grackle

Plankton

Striped Bass

Diamondback Terrapin

Horseshoe Crab and Eggs

The graphs below show the decrease of tree populations in two different locations. Each
picture of a tree represents 10,000 trees in the forest. 

Location A is consistently receiving less rain each year, and location B experienced a
forest fire.

Location A is experiencing the increase in insects feeding on the native trees, and location
B experienced a drought from year 1 to year 3.

Location A experienced a forest fire and location B experienced logging.

Location A is undergoing a drought and location B is experiencing a decrease in insects
feeding on the native trees.

In Community 1, the majority of individuals come from just one of the species. In Community 2, the individuals are spread more evenly across different species. Which community would you consider to be a resilient ecosystem and why...

Community 1 because it is more likely to recover from or adjust easily to change.

Community 1 because it has less biodiversity due to invasive species.

Community 2 because it has been impacted by a natural disaster such as a flood.

Community 2 because there is a better balance of species.

Analyze and interpret the graph. 
This ecosystem was in equilibrium until year 3. Determine the most likely reason this
ecosystem began changing over time.

Disease infected the deer.

Logging started in this area.

Pesticides were sprayed to control the mushroom population.

The bear population decreased.

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.

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.

CFU on 6.LS2.1 Impact of Environmental Variables and 6.LS2.6 Change Over Time (6/19/2024)

CFU on 6.LS2.1 Impact of Environmental Variables and 6.LS2.6 Change Over Time (6/19/2024)

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?

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?

Below is an energy pyramid model for an ecosystem. If an ecosystem is in equilibrium, thepopulation of each organism will not change much from year to year. However, in thisecosystem the rabbits became infected with a disease. Which graph shows the effect on theorganisms in the ecosystem?

If the Razor Clam population decreased due to an oil spill, which populations in the food webwould decrease because they are DIRECTLY affected by the clam? Choose TWO answers.

The graphs below show the decrease of tree populations in two different locations. Eachpicture of a tree represents 10,000 trees in the forest.

In Community 1, the majority of individuals come from just one of the species. In Community 2, the individuals are spread more evenly across different species. Which community would you consider to be a resilient ecosystem and why...

Analyze and interpret the graph. This ecosystem was in equilibrium until year 3. Determine the most likely reason thisecosystem began changing over time.

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

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

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?

Below is an energy pyramid model for an ecosystem. If an ecosystem is in equilibrium, the
population of each organism will not change much from year to year. However, in this
ecosystem the rabbits became infected with a disease. Which graph shows the effect on the
organisms in the ecosystem?

If the Razor Clam population decreased due to an oil spill, which populations in the food web
would decrease because they are DIRECTLY affected by the clam? Choose TWO answers.

The graphs below show the decrease of tree populations in two different locations. Each
picture of a tree represents 10,000 trees in the forest.

Analyze and interpret the graph.
This ecosystem was in equilibrium until year 3. Determine the most likely reason this
ecosystem began changing over time.