Energy Flow

The table lists some organisms found in a swamp ecosystem and their sources of energy.

When constructing an energy pyramid of the swamp ecosystem, which of these would be placed at the top of the pyramid?

• Grass carp

• American alligator

• Eastern mud turtle

• Great blue heron

Tags

NGSS.MS-LS2-1

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A partial meadow food web is shown.

Based on this food web, which organisms are direct sources of energy for secondary consumers?

• Aphid

  Bird

  Rabbit

• Ladybug

  Fox

  Dragonfly

• Frog

  Butterfly

  Berries

• Mouse

  Snake

  Hawk

Tags

NGSS.MS-LS2-3

The energy pyramid below shows the energy made available by producers.

Based on the energy flow between trophic levels in an energy pyramid, how much energy would be expected to be found at the secondary consumer level in this pyramid?

• 100 joules

• 500 joules

• 1,000 joules

• 50 joules

Tags

NGSS.MS-LS2-3

The diagram shows a partial East Texas food web.

Which table correctly classifies these organisms?

• 
• 
• 
• 

Tags

NGSS.MS-LS2-1

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The amount of energy the producers in this energy pyramid provide the primary consumer is 54,000 joules. From this amount, 540 joules are provided to the tertiary consumers. Based on this model, how much of the energy was provided to secondary consumers?

• 53,460 J

• 5,400 J

• 540 J

• 54 J

Tags

NGSS.MS-LS2-3

Food webs such as the one shown were first used in 1927 by the animal ecologist Charles Elton. The food web below represents the feeding relationships among organisms in an Alaskan ecosystem. An environmental change that removed which of these organisms from the ecosystem would cause the most instability in the ecosystem?

• Auklets

• Foxes

• Salmon

• Zooplankton

Tags

NGSS.MS-LS2-1

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The food web shows the flow of energy through a sagebrush-steppe ecosystem. Which of these organisms are in a trophic level that receives a larger percentage of the energy captured by the producers than the percentage received at the bats’ trophic level?

• mountain lions

• snakes

• hawks

• ground squirrels

Tags

NGSS.MS-LS2-3

A marine ecosystem is represented below. What is lost to the environment at each of the trophic levels of this ecosystem?

• Nutrients from the soil

• Living space for the organisms

• Food sources

• Heat

Tags

NGSS.MS-LS2-3

A terrestrial food web is shown below. Which of the following lists only organisms that are secondary consumers in this food web?

• Mice, rabbits, herbivorous insects, and squirrels

• Predaceous insects, toads, spiders, and foxes

• Spiders, foxes, owls, hawks, and snakes

• Insectivorous birds, seed-eating birds, owls, and hawks

The diagram represents a food chain. The arrows in the diagram indicate the  

• 
  return of chemical substances to the environment
• order of importance of the various organisms.  
• direction of energy flow through a series of organisms
• direction in which organisms move in the environment. 

Tags

NGSS.MS-LS2-3