SB5b - Trophic Levels

This food web shows the flow of energy through a coastal Maine ecosystem. Assuming the phytoplankton has 100,000 joules of chemical energy, what can you infer about the amount of energy available to the other trophic levels? Choose 3.

• Herbivores would have 10,000 J of energy available.

• Wading birds would have 1000 J of energy available.

• The invertebrates have 9,000 J of energy available.

• Secondary consumers have 10% of the energy of the producers available.

• The tertiary consumers have 0.1% of the energy from the phytoplankton available.

Analyze the pyramid representing the energy flow through an ecosystem. Select the 3 phrases that accurately describe the flow of energy in this ecosystem according to the image here.

• Top carnivores obtain the maximum energy from the ecosystem.

• Herbivores have more energy available to them than carnivores.

• The primary consumers will only have 10% of the energy made by the producers.

• Soil organisms recycle nutrients but not energy back into the ecosystem.

• Of the energy that is available to the producer level, only ten percent is available to the tertiary consumers.

This picture shows a food web for a forest ecosystem. Evaluate each of the choices and select ALL of those that include ONLY secondary consumers.

• hawks, owls, foxes

• rabbits, foxes, spiders

• spiders, predaceous insects, foxes

• insectivorous birds, hawks, spiders

• herbivorous insects, mice, squirrels

Consider the Canyonlands food web. Evaluate each of the statements provided and select 3 that apply.

• The Fennec Fox is an omnivore.

• The Northern Whiptail is an herbivore.

• Rock squirrels are the only consumers of Yucca.

• Producers include Utah Juniper, Yucca, and Pinyon Pine

• The Rock Squirrel, Spiny Lizard, and Fennec Fox are all primary consumers.

Examine the model of the carbon cycle. Select ALL of the processes that return carbon compounds to the atmosphere.

• photosynthesis

• decay of organisms

• animal respiration

• animal waste products

• auto & factory emmissions