Energy Flow

Which of the following describes an organism that uses the sun, or another source, to create its own energy? (select TWO answers)

• Heterotroph

• Consumer

• Autotroph

• Producer

Which of the following describes an organism that obtains energy by eating other organisms? (select TWO answers)

• Heterotrophs

• Consumers

• Autotrophs

• Producers

Which of the following accurately describes how energy flows through an ecosystem?

• Energy flows in both directions, to and from consumers and the organisms they eat.

• Energy flows in one direction, from the organism that is eaten to the consumer that eats it.

• Energy flows in one direction, from the consumer that eats it to the organism that is eaten.

• Energy does not flow, each organism on a food chain makes its own energy.

Based on this food web, which organisms have the most energy available to them? (select TWO answers)

• The tree

• The bees

• The mountain lion

• The grass

Based on this food web, which organisms have the least amount of energy available to them? (select TWO answers)

• The hawk

• The snake

• The bird

• The grasshopper

What is the rule of 10? (select TWO answers)

• The rule of 10 states that only 10% of energy available at one trophic level will be available at the next.

• The rule of 10 states that only 90% of energy available at one trophic level will be available at the next.

• 10% of energy is lost in the transfer from one energy level to the next.

• 90% of energy is lost in the transfer from one energy level to the next.

Based on this trophic pyramid, how much energy is available to the secondary consumers if the producers have 2,500,000 KJ of energy available?

• 2,500,000

• 250,000

• 25,000

• 2,500

The following pyramid illustrates the amount of biomass present at each trophic pyramid within a grassland ecosystem.

What conclusion can you reach based on the data presented in this biomass pyramid? (select ALL that apply)

• The producers have the least amount of biomass, because they have the most energy available.

• The producers have the most amount of biomass, because they have the most energy available.

• The secondary consumers have less biomass than primary consumers, because they have less energy available.

• The tertiary consumers have the least amount of biomass, because they have the least amount of energy available.

Using the food web, select TWO examples of secondary consumers.

• Grasshopper

• Fox

• Snake

• Frog

Which of the following accurately describes the role decomposers play in an ecosystem?

• Decomposers function to eat autotrophs.

• Decomposers function to compete with consumers for food.

• Decomposers function to return O2 (oxygen) to the ecosystem.

• Decomposers function to return CO2 (carbon dioxide) to the ecosystem.