A park is home to a large number of robins, squirrels and rabbits. The robins and squirrels live in the park’s trees. The robins feed on earthworms and insects that live on the ground. The squirrels eat the acorns produced by the park’s oak trees. The rabbits hide in the bushes and feed on the grass. Which factor would negatively impact the number of rabbits living in the park?

Collecting acorns off the ground.

Highways allow people to travel between towns and cities, but it also divides ecosystems into smaller pieces. Animals can become separated from lakes they use for food and shelter. For example, tiger salamanders use lakes for these reasons. How could the building of highways affect animals such as the tiger salamander?

Tiger salamanders may be cut off from important resources.

Tiger salamanders could improve lake ecosystems.

Tiger salamander habitats may have less pollution.

Tiger salamander habitats within ecosystems would become larger.

Fish dying when the temperature goes too high is an example of…

An abiotic factor limiting a biotic factor

A biotic factor limiting a biotic factor

A biotic factor limiting an abiotic factor

An abiotic factor limiting an abiotic factor

Animals from two different species utilize the same source of nutrition in one area. It is most accurate to say that the animals…

will die because there will not be enough food for both of them

will learn to eat different foods

Which of the following would be an abiotic limiting factor for oysters living in the Chesapeake Bay?

The amount of sediment in the water

The number of humans collecting them

The amount of algae in the water

Fish dying when the temperature goes too high is an example of…

An abiotic factor limiting a biotic factor

A biotic factor limiting a biotic factor

A biotic factor limiting an abiotic factor

An abiotic factor limiting an abiotic factor

An earthworm farmer wanted to grow three species of earthworms, but earthworms can be very picky about the temperature, moisture, and pH balance of their soil. This graph shows the range of soil conditions preferred by three species of earthworms in an earthworm soil bed. Which of these conditions would cause the most competition for the resources among the three species of earthworms?

Moderate temperature, pH of 6.5, and moderate moisture.

Very warm soil, ph of 6, and dry.

Very cold soil, pH of 7, and high moisture.

Moderate temperature, pH of 7.0, and high moisture.

(8.11A) While exploring a lake in Argentina, Laguna del Diamante (Diamond Lake), scientists found rocks covered with mats made of photosynthetic microbes. Flamingos in the area filter the nutrient-rich microbes by pumping the lake water through their bill. What is the relationship between the photosynthetic microbes and the flamingos in the Laguna del Diamante ecosystem?

The microbes are producers, and the flamingos are consumers.

The microbes and parasites, and the flamingos are hosts.

The microbes are carnivores, and the flamingos are predators.

The microbes are herbivores, and the flamingos are carnivores.

(8.11B) The graph below shows the percent of seeds from two plant species that sprout when grown in water containing different amounts of salt. Which of the following best summarizes the effect of saltwater on these plant species?

Both species can sprout in freshwater and saltwater, but Species 2 can sprout in a higher salt concentration than Species 1.

Species 1 can only sprout in freshwater, and species 2 can sprout only in saltwater.

Both species need salt in their water, but Species 2 needs more salt than Species 1.

Species 1 can sprout only in water with a low salt concentration, but Species 2 is not affected by the salt concentration.

(7.10B) The food webs below model relationships among the organisms in two ecosystems. Which ecosystem would be more likely to survive if a disease killed the grasses?

The forest ecosystem, because most of the animals can eat other organisms

The grassland ecosystem, because several predators compete for food.

The forest ecosysem, because it has three top preadator

The grassland ecosystem, because it has many herbivores

Eucalyptus trees compete strongly with native trees for limited water and soil nutrient resources. They prevent native seedlings from becoming established by shading the soil surface, accumulating deep litter layers, and changing the pH balance of the soil. This graph shows the results of an ecosystem that has changed overtime due to the introduction of the non-native species of Eucalyptus trees. Which of the following statements correctly describes the relationship between species A and species B?

Eucalyptus trees win in competition and Native trees go extinct.

Native trees win in competition and Eucalyptus trees go extinct.

The population of both trees decreases over time.

Eucalyptus trees do not compete with each other.

Which would be the impact on producers and consumers if the decomposers in an ecosystem suddenly disappeared?

There will be less nutrients available.

There will be a decreased amount of oxygen.

There will be an increase in atmospheric carbon.

There will be an excess amount of energy available.

Plants interact with living and nonliving components in their environment. Which is an interaction with a nonliving element?

Sandy soil holding the roots of the plants

Small insects eating the stems of the plants

Humans breathing oxygen released by plants

Bees gathering pollen from flowers of plants

All of the following are examples of living things interacting with each other EXCEPT —

frogs sleeping in the mud at the bottom of the pond

birds preying on insects living in the grass

squirrels spreading the seeds of trees by burying them

fish eating plants and other smaller fish

A scientist named Joseph Connell studied two species of barnacles on the shore of a Scottish island. In the area between the average tide and the neap high tide, he found that the population of Species A was smaller than that of Species B. He removed Species B from one area but left both Species A and B in a similar area. The graph below shows the results of this study. Based on these data, which hypothesis was Connell most likely testing?

The two species of barnacles compete with each other for resources.

The populations of both species of barnacles increase more in warm water than in cool water.

Barnacles grow larger when they are isolated from other species.

The two species of barnacles are closely related to each other.

Black walnut trees produce a nontoxic chemical that becomes highly toxic when it is exposed to air or soil. How does this chemical help black walnut trees compete with plants growing nearby?

By suppressing the growth of the other plants

By attracting herbivores to the other plants

By increasing the photosynthesis rates in the other plants

By limiting the amount of water available to the other plants

This graph shows ....

When one population increases, the other increases shortly after.

When one population inceases, the other decreases.

When one population decreases, the other inceases.

When one population increases, the other increases instantly.

Field mice eat corn. Which would most likely happen if the field mouse population grew?

There would be less corn due to the mice eating it.

There would be more corn to feed the field mice.

The habitat would get overpopulated because the mice woudl eat too much.

A foreign insect is introduced into the Texas. It eats a lot of leaves, and trees start to become leafless . Many different animals feed on the new insect, but even they cannot control its numbers. Eventually, trees begin to die. Why would a rapid increase of the new insect population cause certain species of herbivores to vanish or be fewer in number?

They would not have enough to eat.

They would not have enough space to live.

They would not have tree bark to eat.

If an invasive species is introduced to an ecosystem that eats that same plants as the rabbits in the ecosystem, what will happen to the rabbit population?

the rabbit population will likely decrease

the rabbit population will likely increase

the rabbit population will stay the same

Ecosystem Interactions (8.11A, 7.10B)

Authored by Lil Whitman

Science

8th Grade

NGSS covered

Used 30+ times

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45 questions

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MULTIPLE CHOICE QUESTION

1 min • 1 pt

A nonliving element in an ecosystem is an

animal

abiotic factor

biotic factor

organism

Tags

NGSS.MS-LS2-3

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A living or once-living organisms in an ecosystem is a

population

biotic factor

abiotic factor

community

Tags

NGSS.HS-LS2-4

NGSS.HS-LS2-6

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following is not a biotic factor?

mushroom

air

elephant

coyote

Tags

NGSS.5-LS1-1

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following is not an abiotic factor?

sun

temperature

soil

grass

Tags

NGSS.MS-LS2-3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which organism do the owl and the weasel compete for in the food web?

Hawk

Spider

Grasshopper

Shrew

Tags

NGSS.MS-LS2-2

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which of the following is a herbivore?

cricket

frog

hawk

shrew

Tags

NGSS.MS-LS2-3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

(8.11B) The Couch's spadefoot lives in Texas and his the characteristics listed below.
The Couch's spadefoot is adapted to a certain type of environment. Which of these resources is most likely scarce in this environment?

Soil

Sunlight

Water

Oxygen

Tags

NGSS.MS-LS2-1

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Ecosystem Interactions (8.11A, 7.10B)

A nonliving element in an ecosystem is an

A living or once-living organisms in an ecosystem is a

Which of the following is not a biotic factor?

Which of the following is not an abiotic factor?

Which organism do the owl and the weasel compete for in the food web?

Which of the following is a herbivore?

(8.11B) The Couch's spadefoot lives in Texas and his the characteristics listed below.The Couch's spadefoot is adapted to a certain type of environment. Which of these resources is most likely scarce in this environment?

Which two organisms in this food web are COMPETING for food with each other?

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(8.11B) The Couch's spadefoot lives in Texas and his the characteristics listed below.
The Couch's spadefoot is adapted to a certain type of environment. Which of these resources is most likely scarce in this environment?