The diagram shows ecological relationships in an African savanna environment. What happens to the amount of energy available to organisms when moving from trophic level 1 to trophic level 2?

The energy decreases by approximately 90%.

The energy increases by approximately 90%.

The energy decreases by approximately 10%.

The energy increases by approximately 10%.

The diagrams show different ways to represent energy flow. Although very different, both diagrams are acceptable because

both diagrams show the information accurately.

different energy diagrams require different organization.

the numbers of animals in the diagrams are different.

the energy levels change between diagrams.

The picture shows the effect that wind can have on water movement. As the wind blows water away from shore, cold water moves up toward the surface bringing nutrients to the shallow waters. Which statement BEST identifies the relationship taking place in this example?

Abiotic factors can influence energy flow in an ecosystem.

Biotic interactions control the movement of nutrients in the ocean.

Abiotic parts of an environment make up parts of marine food webs.

Biotic interactions are causing an increase in food sources for marine life.

Food webs are used to identify the feeding relationships between organisms. Which statement can be logically concluded about the food web shown?

Organism 8 is definitely a carnivore.

Organism 1 is most likely a type of bacteria.

Organism 2 is definitely an omnivore.

Organism 5 is most likely a plant eater.

Within a cave environment, bat waste products, called guano, are decomposed by organisms such as fungi and bacteria. These are then eaten by creatures such as flatworms. Larger animals like salamanders eat flatworms. Which correctly represents the energy flow described?

Guano → Bacteria → Flatworms → Salamanders

Fungi → Bacteria → Salamanders → Guano

Bats → Guano → Flatworms → Salamanders

Salamanders → Fungi → Bacteria → Flatworms

Mushrooms are classified as decomposers. What will MOST likely happen after decomposition?

Matter will be used by producers.

Scavengers will be consumed decomposers.

Energy will be transferred to primary consumers.

Decomposers will be broken down living organisms.

The food chain shows the flow of energy through an ecosystem. What is the role of decomposers in the system?

They recycle energy from dead organisms back to the ecosystem.

They recycle oxygen back into the ecosystem.

They absorb energy from sunlight to pass on to other organisms.

They obtain and use the energy that remains in living organisms.

In a mangrove swamp, the roots of mangrove trees trap plant debris on which brown shrimp feed. Little blue herons are among the animals that feed on the brown shrimp living among the roots. Which BEST explains the role of brown shrimp in this food chain?

enabling energy to flow from detritus to other organisms

keeping populations of overabundant species under control

producing energy that forms the foundation of the food chain

processing organic material to produce nutrients for plant growth

Many different organisms live in Amanda’s garden. The diagram shows a simple food web of some of the organisms in her garden. Predation helps maintain the stability of an ecosystem. Which statement BEST describes how this garden ecosystem can benefit from the presence of snakes?

The snakes keep the mice from overpopulating, which could deplete plant resources.

The snakes provide an energy source for the moles.

The snakes consume the mice best adapted to their environment.

The snakes eat moles, which allows the population of mice to increase.

Scientists identified a new species of fungus. This organism is classified as a decomposer. Which statement BEST describes the role of the organism in its environment?

It breaks organic matter into its components.

It removes energy through oxidation.

It replicates itself by injecting a host cell.

It produces carbohydrates in the presence of sunlight.

A bracket fungus grows on a log in a forest. The bracket fungus cannot produce its own food, but gains energy from other organisms. How does a bracket fungus contribute to the forest ecosystem?

by recycling materials from the log back into the soil

by storing genetic traits from cells in the log

by prolonging photosynthetic activity in the log

by preventing use of the log by invasive species

This energy pyramid models the flow of energy between organisms in a Florida ecosystem. Which statement describes how energy flows in the pyramid?

Energy is lost between each level.

Energy is consumed only at Level 1.

The most energy available is at Level 3.

Equal amounts of energy are transferred between levels.

The Florida Everglades include ridge-and-slough landscapes. When water moves slowly through the sloughs, dissolved oxygen decreases, which kills microbe populations. A continuation of this will have what immediate impact on the local ecosystem?

Plants that die in the sloughs will not be cycled back into the ecosystem.

Plants will not grow in the sloughs.

Excess microbes from the ridges will migrate to the sloughs.

Biomass will stop moving between trophic levels in the sloughs.

The types of organisms on Earth changed as a result of increased levels of atmospheric oxygen. Which process contributed to this buildup of oxygen in Earth’s atmosphere?

transformation of light energy into chemical bond energy

metabolic production of methane

production of nitrates from inorganic nitrogen

aerobic breakdown of sugars to release energy

Which statement BEST explains why only 10% of the energy produced is transferred to the next trophic level?

The energy is lost as heat to the environment.

Only a small percentage of energy is needed at higher levels.

Amount of energy remains the same but in different forms.

All the energy is used up by primary producers.

Leaves fall from deciduous trees onto the forest floor. These leaves decay slowly and become part of the topsoil. Which change is MOST likely to have a positive impact on the nutrients available in the topsoil?

an increase in the number of decomposers

an increase in the number of predators

The range of temperatures found on Earth’s surface is unique among the planets in the solar system. How does this range of temperatures affect the water cycle on Earth?

by allowing water to exist in three physical states on Earth’s surface

by increasing the amount of all three phases of water on Earth’s surface

by reducing the ability of liquid water to bond with other substances

by decreasing the ability of liquid water to dissolve other substances

In any ecosystem, organisms interact with biotic and abiotic parts of the environment. As a result of all of the interactions, the matter within the system is

lost when animals and plants die.

formed when new animals are born.

The natural transfer of 100 units of carbon between which two reservoirs would take the longest period of time?

from coal deposits to the atmosphere

from the atmosphere to the ocean

from marine organisms to the ocean

from land organisms to the atmosphere

Some bacteria, fungi, and insects can decompose other organisms. Which BEST describes the role of insects in the decomposition process?

Insects help break down organic material.

Insects are the final step in the nutrient cycle.

Insects provide the nitrogen needed for producers.

Insects consume fungi and bacteria to produce carbon.

A dung beetle is an insect that gathers waste from animals, rolls it into a compact ball, lays eggs in it, and buries it in the soil. This gives the eggs a warm, safe place to hatch and provides a food source for the developing larvae. Which impact does the dung beetle MOST likely have on its ecosystem?

It helps return nutrients to the soil.

It makes animal waste harder to degrade.

It causes an unhealthy accumulation of animal waste.

It depletes nutrients from the soil to benefit its young.

How does the energy in each trophic level of an energy pyramid compare to the energy in the preceding level?

It has about 10% of the energy from the level below it.

It has about 5% of the energy from the level below it.

It has about 15% of the energy from the level below it.

It has about 20% of the energy from the level below it.

How will clear-cutting of forests affect the level of carbon dioxide in the atmosphere?

It will increase because of decreased photosynthesis.

It will decrease because of increased respiration.

It will decrease because of decreased photosynthesis.

It will remain constant as respiring animals remove the carbon dioxide.

In the water cycle, water moving from oceans to clouds involves which change in the water?

It turns from salt water to fresh water.

It changes from a solid to a gas.

Its crystal size becomes smaller.

Which represents a short-term storage for carbon?

Carbohydrates stored in fruits and vegetables.

Coral reefs formed from calcium carbonate.

Coal formed from plants that lived long ago.

Limestone rocks quarried at Earth’s surface.

8.L.3.3

Quiz

•

Science

•

8th Grade

•

Practice Problem

•

Hard

•

NGSS

MS-LS2-3, MS-LS2-1, MS-LS1-6

+11

Standards-aligned

Norman Mitchell

Used 15+ times

FREE Resource

69 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Consider this food web: Where is the largest amount of energy found in this food web?

grass

hawk

mouse

grasshopper

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The diagram shows a food web for an ocean ecosystem. How would an increasing shark population most likely affect this ecosystem?

The octopus population would decrease.

The algae population would decrease.

The limpet population would decrease.

The seagull population would decrease.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Look at the picture of the water cycle. Which process is occurring at the arrow labeled 4?

precipitation

evaporation

transpiration

condensation

Tags

NGSS.MS-ESS2-4

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Matter cycles between the environment and living organisms in a complex web of interactions. Which organisms provide the important link in Box A from dead organic matter to matter from the environment?

decomposers

autotrophs

parasites

photosynthesizers

Tags

NGSS.MS-LS2-3

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

An energy pyramid is illustrated. Which statement BEST explains the flow of energy as it moves through the different levels?

Energy decreases as it is lost as heat to the environment.

Energy increases as it is gained from the environment.

Energy is unavailable because it is used up by the organisms at Level 1.

Energy is transferred as it is produced by organisms in the next level.

Tags

NGSS.MS-LS2-3

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Mountain pocket gophers are native to Nevada. Which activity of the gopher transfers energy from one trophic level to another in its ecosystem?

eating the roots of many plants

reproducing with other gopher species

storing food underground

digging burrows to live in

Tags

NGSS.MS-LS2-3

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The organisms shown live in the same habitat. Which BEST describes the exchange of energy between the organisms?

One organism obtains energy from the environment, while the others obtain energy by eating other organisms.

Each organism obtains energy from the environment.

Each organism obtains energy by eating other organisms.

One organism obtains energy by eating other organisms, while the others obtain energy from the environment.

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-3

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8.L.3.3

69 questions

Consider this food web: Where is the largest amount of energy found in this food web?

The diagram shows a food web for an ocean ecosystem. How would an increasing shark population most likely affect this ecosystem?

Look at the picture of the water cycle. Which process is occurring at the arrow labeled 4?

Matter cycles between the environment and living organisms in a complex web of interactions. Which organisms provide the important link in Box A from dead organic matter to matter from the environment?

An energy pyramid is illustrated. Which statement BEST explains the flow of energy as it moves through the different levels?

Mountain pocket gophers are native to Nevada. Which activity of the gopher transfers energy from one trophic level to another in its ecosystem?

The organisms shown live in the same habitat. Which BEST describes the exchange of energy between the organisms?

The diagram shows some organisms in an Antarctic food chain. Which BEST describes the role of krill in this food chain?

Organisms use food energy for various life activities. The diagram shows how food energy is used in a caterpillar. Approximately what percentage of the caterpillar’s food energy is used in the production of biomass?

The pie chart illustrates the proportions of various gases in the atmosphere of Earth. Three of the following gases are part of Wedge Z in the pie chart. Which gas is NOT a part of Wedge Z?

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