8.L.3.3

In a food chain, what is transferred from one organism to another?

• carbon dioxide

• energy

• heat

• water

Study the diagram of an energy pyramid for an environment. Which statement summarizes the relationship between energy and trophic level?

• Animals in a higher trophic level have more energy available to them.

• Animals in the lowest trophic level have the most energy available to them.

• Energy consumption equals energy production at each trophic level.

• Energy is available equally to organisms at all trophic levels.

Study the diagram of an energy pyramid for an environment. Which statement about the flow of energy in an environment is true?

• Energy will flow from the top carnivores to the carnivores.

• Energy will flow from the top carnivores to the herbivores.

• Energy will flow from the herbivores to the carnivores.

• Energy will flow from the carnivores to the herbivores.

Use the diagram that shows an energy pyramid to answer the question. Which statement about the energy pyramid is true?

• The herbivores have more energy available to them than any other type of organism.

• The producers have more energy available to them than the carnivores.

• The producers have less energy available to them than the carnivores.

• The carnivores have more energy available to them than any other type of organism.

Use the diagram that shows a river basin food web to answer the question. Which statement about the food web is true?

• There are more consumers than producers.

• There are more producers than consumers.

• The river basin ecosystem does not contain any carnivores.

• The organisms with the most energy available are the Coyote and Red Fox.

Use the marine food web to answer the question. What would be the most likely effect on the food web if the fish population suddenly decreased significantly?

• The plankton population would decrease.

• The shark population would increase.

• The seal and pelican populations would decrease.

• The krill and squid populations would decrease.

Examine the diagram showing a pond food web. Which organisms would provide a role in the food web that is most similar to the algae's role?

• beetles

• diatoms

• shrimp

• snails

How are nutrients produced by decomposers recycled back in the food chain?

• by being eaten by consumers in the food chain

• by being inhaled by consumers from the air

• by being absorbed from the soil by producers

• by being eaten by decomposers in the food chain

Plants produce food using energy from the Sun. The matter and energy present in the food is transferred to herbivores and then to carnivores. How is matter returned to the environment?

• by using oxygen to release energy

• by the production of energy in the form of heat

• by the decomposition of dead and decaying matter

• by using carbon dioxide to form organic molecules

The image shows the number of organisms present at each trophic level of a food chain in a grassland ecosystem. If more of the same species of snake migrates into the area, what is a potential effect on the ecosystem?

• The population of grass will decrease.

• The population of hawks will decrease.

• The population of hawks will increase.

• The population of rabbits will increase.