Energy Flow

Below is an example of a forest food chain:

corn → mouse → snake → hawk

As energy flows through each trophic level of the food chain, approximately what percentage of energy is available to the next trophic level?

• 1%

• 10%

• 50%

• 100%

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Which statement best represents the relationship between a producer and a consumer?

• A panda eats bamboo.

• A dog chews on a bone.

• A polar bear kills and eats a seal.

• A snake catches a frog and swallows it whole.

Tags

NGSS.MS-LS2-3

Which heterotroph represents a first-level consumer?

• fox

• hawk

• coyote

• rabbit

Tags

NGSS.MS-LS2-3

Which organism belongs to the trophic level with the least amount of energy available for sustaining and maintaining life?

• frog

• grass

• snake

• grasshopper

Tags

NGSS.MS-LS2-3

Which best describes energy transfer in an ecosystem among trophic levels?

• No energy is used in an ecosystem

• Approximately ten percent of all energy is used at each trophic level.

• Approximately half of all energy is used at each trophic level

• Approximately ninety percent of all energy is used at each trophic level.

Tags

NGSS.MS-LS2-3

Into which trophic level will herbivores most likely be placed?

• first level

• second level

• third level

• fourth level

As energy is transferred from organism to organism, some of it is lost to the external environment. Which level experiences the least amount of energy loss?

• producer

• primary consumer

• tertiary consumer

• secondary consumer

Tags

NGSS.MS-LS2-3

Which is the correct representation of energy flow through an ecosystem?

• water → squirrels → nuts

• sun → consumers → producers

• autotrophs → heterotrophs → sun

• sun → autotrophs → heterotrophs

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

In which level is most of the available energy located within an energy pyramid?

• Producer level

• first-order consumer

• second-order consumer

• third-order consumer

Tags

NGSS.MS-LS2-3

There are usually no more than four trophic levels in a food chain. Which best explains why this is true?

• A shortage of organisms would prevent more than four trophic levels.

• The energy lost through a food chain prevents the support of more than four trophic levels.

• Competition at the lower levels eliminates the need for more than four trophic levels.

• Decomposers would be unable to break down the waste materials produced by more than four trophic levels.

Tags

NGSS.MS-LS2-3