Free Practice Quiz Question List

2 Productivity and Trophic Structure Online Quiz Questions

Use this free practice quiz with 20 questions to review 2 Productivity and Trophic Structure, test your knowledge, and prepare for your next test or exam.

20 questions

True or false

1 point

True or false: Energy flows through ecosystems, while nutrients cycle.

A
True
B
False

Choose one

1 point

In a food chain, what does an arrow from grass to a grasshopper represent?

A
From the consumer to the food it eats
B
From the food to the consumer that eats it
C
From decomposers to the organisms they break down
D
From the ecosystem to the organisms within it

Fill in the blank

1 point

Complete the relationship: Net primary productivity equals gross primary productivity minus .

True or false

1 point

True or false: A food chain represents all the interconnected feeding relationships in a community.

A
True
B
False

Choose one

1 point

Which description best distinguishes a food web from a food chain?

A
A diagram showing only the amount of energy producers store
B
A single pathway through which energy passes
C
A network of interconnected feeding pathways
D
A diagram showing the number of organisms at each trophic level

Written response

1 point

What is the ecological term for the fraction of energy at one trophic level that becomes available as production at the next? Enter the term.

Fill in the blank

1 point

Decomposers return to the environment, while energy ultimately dissipates as .

Choose all

1 point

Select all accurate statements about ecological pyramids.

A
An energy pyramid is always upright.
B
A biomass pyramid can be inverted in an aquatic ecosystem.
C
A numbers pyramid is always upright.
D
A biomass pyramid shows the number of organisms present.

Choose one

1 point

Which statement best describes the ecological significance of net primary productivity (NPP)?

A
The total amount of biomass in an ecosystem at one moment
B
The producer biomass remaining after respiration that can potentially support consumers
C
The total energy consumers use for movement
D
The number of consumers supported by a food web

Written response

1 point

Use $\text{NPP} = \text{GPP} - \text{producer respiration}$ . If gross primary productivity is 860 energy units and producer respiration is 310 energy units, what is NPP? Enter the numerical value in energy units.

Choose all

1 point

Select all reasons why less energy is available as production at the next trophic level.

A
Organisms use energy for respiration and other life processes.
B
Some energy remains in uneaten material or waste.
C
All energy taken in becomes biomass available to the next trophic level.
D
Energy used in metabolism is ultimately released as heat.

Choose one

1 point

In the food chain grass → grasshopper → frog → snake, what trophic level does the frog occupy?

A
Producer
B
Primary consumer
C
Secondary consumer
D
Tertiary consumer

Open ended

1 point

Explain why less energy is available at higher trophic levels and how the approximate 10% transfer rule helps explain why food chains usually have relatively few levels. Acknowledge how actual transfer efficiency varies.

Choose one

1 point

Which measurement describes primary productivity rather than a snapshot of standing biomass?

A
The total biomass present at a particular moment
B
The rate at which producers capture energy and form biomass
C
The number of trophic levels in a food chain
D
The total number of producers in an ecosystem

True or false

1 point

True or false: Energy flows through ecosystems, whereas nutrients cycle.

A
True
B
False

Choose one

1 point

In the food-chain segment $\text{frog} \to \text{snake}$ , what does the arrow indicate?

A
Energy moves from the snake to the frog.
B
Energy moves from the frog to the snake.
C
The arrow shows nutrients moving from the snake to the frog.
D
The arrow shows that the frog and snake are at the same trophic level.

Choose one

1 point

A community includes several species that eat more than one kind of organism, and some species are eaten by multiple predators. Which representation best captures these interconnected feeding relationships?

A
A food web shows only one pathway of energy transfer.
B
A food web shows how energy is captured by producers through photosynthesis.
C
A food web connects multiple food chains and feeding relationships.
D
A food web shows the amount of biomass at each trophic level.

Choose one

1 point

Producers generate $900$ energy units, and respiration uses $350$ of those units. How many energy units remain as net primary productivity?

A
$350$ energy units
B
$550$ energy units
C
$900$ energy units
D
$1{,}250$ energy units

Written response

1 point

Using the rough $10\%$ transfer rule, if producers store $8{,}000$ energy units, about how many energy units become available as production at the next trophic level?

Written response

1 point

What term describes an organism’s feeding position in the flow of energy through an ecosystem?

2 Productivity and Trophic Structure Online Quiz Questions

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