Which change would most likely cause an INCREASE in the number of squirrels living in an area?

An increase in the number of predators in an area

An increase in competition between the squirrels

A DECREASE in the number of forest fires

Which change would most likely cause a DECREASE in the number of deer in an area?

An INCREASE in the number of forest fires

A decrease of the number of predators in the area

A decrease of competition between the deer

Hawks and owls are known to live in the same areas and eat the same foods. Why is there no competition seen between hawks and owls?

Hawks are active during the day, while owls are active during the night

Hawks and owls have different predators

Hawks and owls have different feather colors for camouflage in different areas

Hawks have speckled eggs, while owls only have white eggs

What one answer below is TRUE about the relationship between organisms at different levels in a food web?

3rd order consumers limit the population size of 2nd order consumers, thereby preventing a population decrease of 1st order consumers

3rd order consumers are a food source for 1st order consumers

1st order consumers compete with 2nd order consumers for access to nutrients in the environment

Consumers break down the remains of producers, returning their nutrients to the environment

What is the name for organisms that get energy from sunlight and turn it into energy in food molecules?

producers, such as phytoplankton

3rd order consumers, such as sharks

2nd order consumers, such as stingrays

Polar bears live in the Northern Hemisphere (cold) and need a LARGE amount of Arctic ice to hunt. Which of the following is most likely to occur if the amount of Arctic ice in their habitat decreases SIGNIFICANTLY over a SHORT period of time?

Polar bears will become extinct

Polar bears will migrate south to warmer regions

Polar bears will develop a larger body size to hunt larger prey

Polar bears will adapt to water environments by evolving to have gills

Studying bird beaks can help scientists understand what about the birds?

What predator the birds are hunted by most often

Whether or not the birds migrate south for the winter

Only ONE of the following choices is TRUE - select the True statement.

An ecosystem is likely to include more than one producer and more than one consumer.

Abiotic factors include water, fish, plants, and turtles.

Organisms in the same ecosystem habitat do not typically interact with one another.

Ecosystems are made up of only one population of organisms.

Which of the following statements is FALSE about organisms living in a desert ecosystem:

The organisms have adaptations allowing them to survive in ANY type of ecosystem

The organisms have adaptations that support survival in a dry climate.

The organisms have behaviors that enable them to survive in a desert.

The organisms have physical characteristics that help them to survive a desert.

Which of the following statements about the nitrogen cycle are TRUE? (select 3)

Nitrogen is found in MANY forms within the nitrogen cycle.

The nitrogen cycle processes continuously repeat.

Nitrogen flows through both living things and the atmosphere.

Nitrogen is transferred to decomposers through only 1 path.

Which one of the following statements about natural cycles is FALSE?

The water CYCLE begins with evaporation and ends with runoff.

Water, carbon, and nitrogen all flow through all levels of a food web.

Photosynthesis is a main process of the carbon cycle.

Nitrogen can exist within both the biotic and abiotic components of an ecosystem.

Examine this graph showing the populations of frogs (predators) and crickets (prey) over time. What conclusion can be made about their population fluctuations?

The predator-prey relationship causes the cricket population to decrease as the frog population increases.

Both populations gradually decrease over time without any one cause.

The predator-prey relationship is likely the ONLY factor that causes population fluctuations.

There is no scientific relationship between the cricket population and the frog population.

What are TWO examples of mutualism (🙂 🙂) in nature? (select two)

Some shrimp and fish live together. The shrimp create their shelter, while the fish alert the shrimp to nearby predators.

Ants live in a tree. The ants use the tree for their habitat, while the tree is protected from predators by the stinging ants.

Some worms are eaten by humans. They live inside the human and steal their nutrients, while the human becomes sick and can die.

A bird builds a nest in a tree. The bird is protected by living in the tree, while the tree is unaffected.

What is ONE example of commensalism (🙂😐) below?

A bird builds its nest in a tree. The bird is protected by living in the tree, and the tree is unaffected.

Clownfish have adapted to live inside the poisonous tentacles of sea anemones. The anemones are protected by the fish, and the fish have a niche food source.

Bees are well known to get pollen from flowers. The bees use the pollen for food, while the flower's pollen is spread, creating more flowers.

A species of wasp lays its eggs inside of a ladybug. This eventually results in the death of the ladybug.

Which TWO examples below demonstrate examples of parasitism (🙂☹️) in nature? Select TWO.

A species of wasp lays its eggs inside of a ladybug, resulting in the ladybug's eventual death.

A tapeworm lives inside of a human. The worm benefits by stealing food and nutrients from the human, and the human can become very sick as a result.

A bird builds its nest in a tree. The tree provides shelter and protection to the bird, and the tree is unaffected.

Some shrimp and fish live together in an aquatic ecosystem. The shrimp create and share their shelter, while the fish alert the shrimp to nearby predators.

Which of the following is an example of mutualism (🙂🙂) in nature?

A bee pollinates a flower while collecting nectar for food.

A fungus decomposes a fallen tree.

A parasite lives inside a host organism.

What role do producers play in an ecosystem?

They provide energy for consumers by making their own food.

They compete with consumers for resources.

They are the top predators in the food chain.

Ecosystems Summative Review

Authored by Kristina Gotfredsen

Science

7th Grade

NGSS covered

Used 197+ times

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31 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the name for organisms in a food web that decompose materials and recycle wastes?

Producers

Decomposers

First-Order Consumers

Tertiary Consumers

Tags

NGSS.MS-LS2-3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the original source of energy for any ecosystem?

Ducks

Soil

The sun

The consumers

Tags

NGSS.MS-LS2-3

NGSS.MS-LS1-6

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Herbivores, or organisms that only eat producers, are also known as what order of consumer in a food web?

Decomposers

Third order

Second order

First order

Tags

NGSS.MS-LS2-3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In this food web, where is energy transferred directly from grasses to?

Rabbit, mouse, and grasshopper

Only mouse

Frog and bird

Only rabbit

Tags

NGSS.MS-LS2-3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In this food web, where is the energy from grasshoppers transferred directly to?

Only frog

Only bird

Grasses

Frog and bird

Tags

NGSS.MS-LS2-3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In this food web, where does the hawk get its energy directly from?

Only snake

Rabbit, mouse, and snake

Fox and snake

Owl, frog, and grasshopper

Tags

NGSS.MS-LS2-3

MULTIPLE SELECT QUESTION

45 sec • 1 pt

Select the BEST two reasons for why the energy pyramid is larger at the bottom than at the top.

As you move up the pyramid, the amount of available energy decreases

Some energy is lost to the environment as heat at each level, making the top smaller

There are fewer organisms at the bottom of the pyramid

The bottom of the pyramid has the least food and/or energy

Tags

NGSS.MS-LS2-3

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Ecosystems Summative Review

What is the name for organisms in a food web that decompose materials and recycle wastes?

What is the original source of energy for any ecosystem?

Herbivores, or organisms that only eat producers, are also known as what order of consumer in a food web?

In this food web, where is energy transferred directly from grasses to?

In this food web, where is the energy from grasshoppers transferred directly to?

In this food web, where does the hawk get its energy directly from?

Select the BEST two reasons for why the energy pyramid is larger at the bottom than at the top.

Organisms are classified as producers if they are able to do what?

All of the living AND nonliving things in an area is known as an:

All of the white-tailed rabbits that live in an area are known as a: (population or community)

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