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3–2 Pyramids…
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Ecological Pyramids
0.1% Third-level consumers
Energy Pyramid:
Shows the relative amount of energy available at each ________________
Only _______ of the energy that is stored in one trophic level is passed on to the next level.
1% Second-level consumers
10% First-level consumers
Ecological pyramids show the decreasing amounts of energy, living tissue, or number of organisms at successive feeding levels. The pyramid is divided into sections that represent each trophic level. Because each trophic level harvests only about one tenth of the energy from the level below, it can support only about one tenth the amount of living tissue.
100% Producers
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Ecological Pyramids
Biomass Pyramid:
Represents the amount of living organic matter at each trophic level. Typically, the ________ biomass is at the _______ (producers) of the pyramid.
What do you notice about the amounts of mass as you go up/down the pyramid?
50 grams of human tissue
500 grams of chicken
5000 grams of grain
Ecological pyramids show the decreasing amounts of energy, living tissue, or number of organisms at successive feeding levels. The pyramid is divided into sections that represent each trophic level. Because each trophic level harvests only about one tenth of the energy from the level below, it can support only about one tenth the amount of living tissue.
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Ecological Pyramids
Pyramid of Numbers:
Shows the relative ___________________ at each ___________ level.
Ecological pyramids show the decreasing amounts of energy, living tissue, or number of organisms at successive feeding levels. The pyramid is divided into sections that represent each trophic level. Because each trophic level harvests only about one tenth of the energy from the level below, it can support only about one tenth the amount of living tissue.
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3–2
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3–2
The main source of energy for life on Earth is
organic chemical compounds.
inorganic chemical compounds.
sunlight.
producers.
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3–2
Organisms that feed on plant and animal remains and other dead matter are
detritivores.
carnivores.
herbivores.
autotrophs.
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3–2
How does a food web differ from a food chain?
A food web contains a single series of energy transfers.
A food web links many food chains together.
A food web has only one trophic level.
A food web shows how energy passes from producer to consumer.
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3–2
In a biomass pyramid, the base of the pyramid represents the mass of
heterotrophs.
primary consumers.
producers.
top level carnivores.
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3–2
The amount of energy represented in each trophic level of consumers in an energy pyramid is about
10% of the level below it.
90% of the level below it.
10% more than the level below it.
90% more than the level below it.
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