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WorksheetsUnderstanding Food Webs and Chains
Total questions: 17
Worksheet time: 9mins
A food web is a model that shows
the types of foods different organisms can eat.
the number of available food sources in any given ecosystem.
the feeding relationships between organisms in an ecosystem.
the way different organisms use the energy they obtain from their food.
How do food webs represent the flow of energy in the model?
Food web models represent energy flow using arrows.
Food web models represent energy flow by separating predator and prey.
Food web models represent energy flow by organizing organisms by size.
Food web models represent energy flow through chemical reaction equations
Matter flowing through a food web
take one path.
take opposite paths.
always takes the same path.
can take more than one path.
A food chain is
an individual path in a food web.
a list of available prey for predators.
a term to describe how matter is recycled in a food web.
the chemical reaction that happens when an organism eats food.
Which of these describes a purpose of a food chain?
A food chain attracts predators to available prey.
A food chain tracks the transfer of matter and energy.
A food chain teaches scientists how to add more predators to an ecosystem.
A food chain tracks all the feeding relationships between organisms in an ecosystem.
Which of these describes a direct effect of an interaction in a food web?
An increase in rain causes an increase of coyotes.
An increase in wildfires causes a decrease in rattlesnakes.
An increase in humans causes a decrease in supermarkets.
An increase in rabbits causes a decrease in plant populations.
Which of these is a decomposer?
bacteria
a dead worm
a fox
a hummingbird
Which of these is NOT a form of waste?
dung
shedding skin cells.
dead leaves
mushrooms
How is a decomposer also a consumer?
A decomposer only eats consumers.
A decomposer consumes only energy, but no matter.
A decomposer consumes the remains of other organisms.
A decomposer only consumes, but does not produce matter.
Which of these accurately describes the role of a decomposer?
Decomposers keep consumers healthy.
Decomposers act as nature's recyclers.
Decomposers eliminate all unused matter.
Decomposers act as prey for all organisms.
How do producers get their matter and energy from decomposers?
Producers consume decomposers.
Producers borrow their matter and energy from decomposers.
Producers become decomposers in order to get matter and energy.
Producers absorb the raw materials that decomposers produce.
Which of these trophic levels has the most energy?
First stage consumers
Second stage consumers
Third stage consumers
Fourth stage consumers
Why isn't all of one prey's matter transferred to the predator that consumes it?
Matter can become waste.
Matter can be lost as carbon dioxide.
Matter can be lost to the environment.
All of the above.
A trophic pyramid is a model that shows
how many organisms can exist in a single food web.
how much total energy and matter exists in a single ecosystem.
how much energy flows from one stage to the next in a food chain.
the rate at which energy and matter is consumed by each consumer in a food chain.
How do trophic pyramids get their shape?
Trophic pyramids get their shape from the loss of energy that happens at each stage.
Trophic pyramids get their shape from the types of organisms that are represented in the pyramid.
Trophic pyramids get their shape because a pyramid is the easiest shape to represent a food web.
Trophic pyramids get their shape from the number of organisms at each point on a food chain.
What do trophic pyramids demonstrate about the flow of energy in an ecosystem?
The amount of energy available to each organism decreases as it flows through the ecosystem.
The amount of energy available to each organism increases as it flows through the ecosystem.
The amount of energy available to each organism varies as it flows through the ecosystem.
The amount of energy available to each organism stays the same as it flows through the ecosystem.
What percentage of energy is typically transferred between each level of a trophic pyramid?
1%
10%
50%
100%
